WO2006016442A1 - 結晶粒が微細化された銅基合金鋳物 - Google Patents
結晶粒が微細化された銅基合金鋳物 Download PDFInfo
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- WO2006016442A1 WO2006016442A1 PCT/JP2005/008662 JP2005008662W WO2006016442A1 WO 2006016442 A1 WO2006016442 A1 WO 2006016442A1 JP 2005008662 W JP2005008662 W JP 2005008662W WO 2006016442 A1 WO2006016442 A1 WO 2006016442A1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
- C22C9/04—Alloys based on copper with zinc as the next major constituent
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P11/00—Drugs for disorders of the respiratory system
- A61P11/06—Antiasthmatics
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
- B22D21/02—Casting exceedingly oxidisable non-ferrous metals, e.g. in inert atmosphere
- B22D21/022—Casting heavy metals, with exceedingly high melting points, i.e. more than 1600 degrees C, e.g. W 3380 degrees C, Ta 3000 degrees C, Mo 2620 degrees C, Zr 1860 degrees C, Cr 1765 degrees C, V 1715 degrees C
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
- B22D21/02—Casting exceedingly oxidisable non-ferrous metals, e.g. in inert atmosphere
- B22D21/025—Casting heavy metals with high melting point, i.e. 1000 - 1600 degrees C, e.g. Co 1490 degrees C, Ni 1450 degrees C, Mn 1240 degrees C, Cu 1083 degrees C
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/02—Alloys containing less than 50% by weight of each constituent containing copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/06—Alloys containing less than 50% by weight of each constituent containing zinc
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
Definitions
- the present invention relates to a copper-based alloy ceramic in which crystal grains are refined after melting and solidification, and particularly to a Cu-Zn-Si-based copper-based alloy ceramic.
- Copper-based alloys are known to have improved yield strength by refining crystal grains, just like ordinary metal materials.
- the strength is 1Z 2 which is the reciprocal of the crystal grain size, based on the Hallbeck's law. It is said to improve in proportion to the power.
- the basic mode of making the crystal grain size of copper-based alloys finer is as follows: (A) when crystal grains become finer when the copper-base alloy is melted and solidified; (Forgings such as ingots, die castings, and melt-forged products), deformation and heat treatment such as rolling may cause the stored grains such as strain energy to become the driving force, resulting in finer crystal grains .
- Zr is known as an element that effectively acts on the refinement of crystal grains.
- the method (B) is widely used, and the crystal grains are refined by heat-treating the melted and solidified lumps, forged products, etc., and applying distortion. Has been done.
- Patent Document 1 Japanese Patent Publication No. 38-20467
- Patent Document 2 Japanese Unexamined Patent Application Publication No. 2004-100041
- Japanese Patent Publication No. 38-20467 performs solution treatment on copper alloys containing Zr, P and Ni. Next, the average grain size after 75% cold working was examined. From 28 0 m without Z r, 1 7 0 ⁇ m (Z r: 0. 0 5%), 50 m (Zr: 0.13% contained), 2 9 ⁇ ( ⁇ r: 0.22% contained), 6 m (Zr: 0.89% contained) As described above, it is described that the material is refined in proportion to the increase in the Zr content. In this publication, in order to avoid an adverse effect due to excessive Zr content, the content of Zr is proposed to be 0.05 to 0.3%.
- the crystal grains are refined by the method (A) when the copper-based alloy is melted and solidified.
- an object of the present invention is to provide a copper-based alloy whose crystal grain size is refined in the melt-solidification process. More specifically, the average crystal grain size after melt-solidification is about 100 m or less. It is to provide a Cu-Zn-Si-based copper-based alloy ceramic refined to a minimum.
- the first copper-based alloy product according to the present invention is, in mass%, Cu: 69 to 88%, Si: 2 to 5%, Zr: 0.0005 to 0.00. 04%, P: 0.001 to 0.25% and 3.5 XS i—3 XP ⁇ 71 Satisfied, the balance is composed of Zn and inevitable impurities, the average crystal grain size after melting and solidification is about 100 trn or less, and the phase structure is the sum of the area ratio of ⁇ phase, / C phase and phase a 80% or more.
- the second copper-based alloy ceramic according to the present invention has the composition of the first copper-based alloy ceramic as a crystal grain refining element, Mg: 0.001 to 0.2%, B: 0.00. At least one selected from the group consisting of 003 to 0.1%, C: 0.0002 to 0.01%, Ti: 0.001-0. 2%, and rare earth elements: 0.01 to 0.3%
- Mg and B is [i]
- C 0.0002 to 0.01%
- Ti 0.001-0. 2%
- rare earth elements 0.01 to 0.3%
- the group consisting of Mg and B is [i]
- Ti and rare earth elements is [ii]
- 60 ⁇ C u-3.5 XS i-3 XP-0.5 X [i] + 0.5 X [ii] ⁇ 71 is satisfied.
- the first to fourth copper-based alloy products according to the present invention may have Sn: 0.1 to 2.5% and Sb: 0.02 to 0.25% as corrosion resistance improving elements, if desired. And As: 0.02-0 At least one selected from the group consisting of 25%, and as an element for improving machinability, P b: 0.004 to 0.45%, B i: 0.004 to 0.45%, S e: 0.03 to 0.45 % And Ding 6: It may further contain at least one selected from the group consisting of 0.01-0.45%.
- the term “average crystal grain size after melting and solidifying” means that after the copper-based alloy of a predetermined component is melted and solidified, deformation processing such as rolling or heat treatment is performed at all. It means the average grain size measured in the absence.
- the copper-based alloy product of the present invention has the above-described component composition and phase structure, and the average crystal grain size after melting and solidification is refined to about 100 m or less.
- the crystal grains are refined in the melt-solidification stage, it can withstand the shrinkage during solidification, and the occurrence of forged cracks can be reduced.
- the hole and porosity generated during the solidification process can easily escape to the outside, making it possible to produce healthy porridges with no flaws such as a nest and a shrinkage nest.
- dendrites that crystallize during the solidification process are not typical dendritic forms unique to the sculptured structure, but are divided into arms, preferably circular, elliptical, polygonal, or cruciform. It is. For this reason, the fluidity of the molten metal is improved, and even in the case of a thin and complex mold, the molten metal can be distributed to every corner.
- the crystal grains are refined, they have excellent mechanical and other mechanical properties, corrosion resistance, and machinability, so they have a complicated shape, such as valves, fittings, mixing plugs, and faucet fittings. This is particularly effective for the as-cast product.
- FIG. 1 is a micrograph (350 ⁇ ) showing the phase structure of Sample No. 9 of the inventive example.
- FIG. 2 is a photomicrograph (350 times) showing the phase structure of sample No. 103 of the comparative example.
- Fig. 3 is a macro photograph and a micrograph (75 times) of the cross-sectional metal structure of Sample No. 9 of the inventive example.
- Figure 4 is a macro and micrograph (75x magnification) of the cross-sectional metallographic structure of specimen No. 10 of the inventive example.
- FIG. 5 shows a macrograph and a micrograph (75 ⁇ ) of the cross-sectional metallographic structure of specimen No. 6 of the inventive example.
- Fig. 6 shows a macrograph and a micrograph (75x magnification) of the cross-sectional metallographic structure of specimen No. 112 of the comparative example.
- FIG. 7 is a macrophotograph and micrograph (75 ⁇ ) of the cross-sectional metallographic structure of specimen No. 110 as a comparative example.
- FIG. 8 is a macro photograph and a micrograph (75 times) of the cross-sectional metallographic structure of specimen No. 103 of the comparative example.
- Fig. 9A is a graph showing the relationship between the Zr content and the average grain size within the range of 64 ⁇ Cu_3.5 XS i—3 XP ⁇ 67.
- Figure 9B is a logarithmic scale of the Zr content of Figure 9A.
- FIG. 10 is a photomicrograph (75x magnification) showing the form of the dendrite of Sample No. 8 of the inventive example.
- FIG. 11 is a photomicrograph (magnified 75 times) showing the form of the dendrite of test sample No. 115 of the comparative example.
- FIG. 12 is a photomicrograph (75 ⁇ ) showing the morphology of the dendrite of test sample No. 110, which is a comparative example.
- Fig. 13 A to Fig. 13 C are diagrams schematically showing the final solidified part in the evening test.
- Fig. 13 A is evaluated as "good” and Fig. 13 C is evaluated as "bad”.
- Figure 13B is the middle.
- FIG. 14A to 14C are cross-sectional views of the main part of the inner surface of specimen No. 9 of the invention example, FIG. 14A is a macroscopic photograph, FIG. 148 is 3.5 times, and FIG. 14C is 18 times. This is an enlarged photo.
- Fig. 15A to Fig. 15C are cross-sectional views of the main part of the inner surface of test sample No. 109 of the comparative example.
- Fig. 15 A is a macroscopic photograph
- Fig. 15 B is 3.5 times
- Equation (2) Cu-3.5XS1-3XP 0.5X [i] + 0.5X [ii]
- the first copper base alloy according to the present invention has Cu: 69 to 88%, Si: 2 to 5%, Zr: 0.0005 to 0.04%, P: 0.0 1-0. Containing 25%, it consists of the balance Zn and inevitable impurities.
- C11 is the main element of the alloy.
- the addition of Zr and P does not refine the crystal grains of all the copper alloys. As described later, the present inventor has found that when there is a predetermined relationship with the contents of Si and P, a remarkable effect of improving the grain refinement can be achieved by adding a small amount of Zr.
- Cu should be contained at 69% or more.
- the content exceeds 88%, the effect of crystal grain refinement is impaired. Therefore, the upper limit is 88%, preferably 70 to 84%, more preferably 71 to 79.5%, and most preferably 72 to 79%.
- Si When Si is contained together with Zr, P, Cu, and Zn, it is an element that lowers the stacking fault energy of the alloy and exhibits a remarkable grain refinement effect. The effect is effective when the added amount is 2% or more. However, when it exceeds 5%, the addition of Cu and Zn tends to saturate or conversely reduce the refining effect, and further reduce ductility. Also, heat transfer The conductivity is lowered and the solidification temperature range is widened. Si also has the effect of improving the fluidity of the molten metal, preventing the molten metal from being oxidized, and lowering the melting point. It also has the effect of improving corrosion resistance, especially dezincification corrosion resistance and stress corrosion cracking resistance.
- the Si content is preferably 2.2 to 4.8%, more preferably 2.5% to 4.5%, and most preferably 2.7 to 3.7%.
- Zr is an important element for refining the crystal grains of the porcelain. As will be described later, when the contents of Cu, Si and P are in a predetermined relationship, an excellent crystal grain refining effect is exhibited at 0.0005% or more, and 0.0008% or more is more preferable. 0010% or more is most preferable, and the effect is almost saturated at a content of 0.0053%.
- Zr has a very strong affinity with oxygen and sulfur, and in view of the fact that copper alloy products are usually manufactured using recycled materials and scrap materials in the atmosphere, It is difficult to add to a narrow composition range, and it must be added to some extent.
- the upper limit of Zr is specified as 0.04%.
- zirconium oxide is easily formed in the porcelain, and it becomes difficult to obtain a healthy porridge.
- Zr is an expensive metal, the use of a large amount is also economically disadvantageous.
- the content is preferably 0.0290% or less, more preferably 0.0190%, and as described above, 0.005% at which the effect is saturated is most preferable. That is, when considering these influences in addition to the grain refining action of Zr, the Zr content is most preferably 0.0001 to 0.0095%.
- P is an important element for refining the crystal grains of porcelain. Excellent crystal grain refining effect in the presence of Zr. Also, increase the fluidity of the molten metal, It works to disperse and precipitate the ⁇ , r , and j3 phases, which will be described later, and to improve the corrosion resistance. The effect is exhibited when the content is 0.01%. However, if the content is too high, an intermetallic compound with a low melting point is formed and becomes brittle. For this reason, the upper limit is set to 0.25%, taking into account the ease of manufacturing the garment.
- Zn is a main element that constitutes the copper-based alloy case of the present invention, lowers the stacking fault energy of the alloy, refines the crystal grain of the case, improves the fluidity of the melt, and In addition to lowering the melting point, preventing Zr oxidation loss, improving corrosion resistance, and improving machinability, it also works to improve mechanical strength such as tensile strength, resistance, impact strength, and fatigue strength. is there. For this reason, Zn is defined as the balance of each of the aforementioned constituent elements.
- relational expression (1) Cu-3.5 XS i-3 It is necessary to adjust so that the value of XP satisfies 60-71.
- This relational expression is obtained experimentally based on the measurement results of the crystal grains after melting and solidification, and the copper-based alloy cake is refined to an average crystal grain size of about 100 m or less. It is defined as a condition for The significance of this relational expression (1) will be described in detail later.
- the value is preferably 62.5 to 68.5, and most preferably 64 to 67.
- the copper-based alloy product of the present invention achieves the desired grain refining action.
- P, Zr, and Si, P and Zr, Si and Zr, Si and P It is preferable that P / Zr satisfy the relationship of 0.8 to 2500, S i / Zr ⁇ S80 to 6200, and 31 satisfy 12 to 220, respectively.
- PZZ r 1.5 to 15 is preferable, 2 to 100 is more preferable, and 4 to 50 is most preferable.
- S i / Z r 1 0 0 to 5 0 0 0 is preferable, 120 to 3500 is more preferable, and 300 to 1500 is most preferable.
- S i / P is more preferably 16 to 160, further preferably 20 to 120, and most preferably 25 to 80.
- Zr is based on the assumption that Cu, Zn, Si, P, P / Zr, Si / Zr, Si / P, relational expression (1), and phase structure are within the scope of the claims.
- P by co-addition with P, it has the function of increasing the stacking fault density of the melt-solidified material, and crystal nucleation is much higher than crystal growth.
- the ultra-fine grain size is realized.
- the second copper-based alloy alloy according to the present invention includes, as an element that promotes the refinement of crystal grains, the constituent elements of the first copper-based alloy alloy, Mg: 0.001 to 0.2%, B : Selected from the group consisting of 0.003 to 0.1%, C: 0.002 to 0.01%, T i: 0.001 to 0.22%, and rare earth elements: 0.01 to 0.3% In addition, at least one of the above can be further contained.
- Mg is consumed due to sulfur and oxygen mixed from scrap materials such as defective products, waste products, scraps of pressed wires, pressed copper alloy scraps, scraps, wastewater generated in the process, wastewater, weirs, scraps, etc.
- scrap materials such as defective products, waste products, scraps of pressed wires, pressed copper alloy scraps, scraps, wastewater generated in the process, wastewater, weirs, scraps, etc.
- Mg immediately before the addition of Zr is a preferable element for reducing the amount of sulfur and oxygen in the molten metal in the form of MgS and MgO and utilizing Zr. For this reason, it is preferable to contain Mg at least 0.001%.
- B, C, T i and rare earth elements have the effect of grain refinement, so at least B is 0.003%, C is 0.0002%, and T i is 0 in order to effectively exert the effect. It is preferable to contain 0.001% and 0.01% of the rare earth element.
- the rare earth element (REM) means 14 kinds of lanthanide elements including La, Ce, etc. in addition to S c and Y.
- Mg, B, C, Ti, and rare earth elements are saturated even if they are added too much, and on the contrary, the molten metal flow properties are hindered. Therefore, the upper limit of these elements For Mg, 0.2%, B is 0.1%, C is 0.01%, Ti is 0.2%, and rare earth elements are 0.3%.
- the third copper-base alloy case according to the present invention has a composition of A 1: It may further contain at least one selected from the group consisting of 0.02 to 1.5%, Mn: 0.2 to 4.0%, and Cr: 0.01-0.2%.
- the alloy with fine crystal grains is further improved in strength and wear resistance.
- a 1 improves strength and wear resistance by strengthening the matrix. Therefore, it is desirable to contain at least 0.02% or more, preferably 0.1% or more. However, if the content is too high, the elongation decreases. For this reason, the upper limit is 1.5%.
- Mn combines with S i to form an Mn—S i intermetallic compound, which contributes to improved wear resistance. Therefore, it is preferable to contain at least 0.2% or more, preferably 0.5% or more. However, the content exceeding 4.0% not only saturates the effect, but also reduces the fluidity of the molten metal, and the formation of an Mn-Si intermetallic compound makes S effective for refinement. i is consumed. For this reason, the upper limit of Mn is specified as 4.0%. In addition, it is preferable to make it 3.5% or less.
- the Si content In order to reduce the consumption of Si, which is effective for miniaturization, the Si content must satisfy the relationship 2.3 + 1/3 Mn ⁇ S i ⁇ 3.5 + 1/3 M n Preferably, it is more preferable to satisfy the relationship 2.6 + 1 / 3M n ⁇ S i ⁇ 3.4 + l / 3Mn.
- Cr is partly dissolved in the matrix, and partly contains Si and fine intermetallic compounds. Form and improve wear resistance. For this reason, it is preferable to contain 0.01% or more. However, if the content is too large, the Cr 1 Si compound becomes coarse and the effect is saturated. For this reason, the upper limit is defined as 0.2%.
- the fourth copper-based alloy container according to the present invention has a composition of A 1: 0 02 to 1.5%, Mn: 0.2 to 4.0%, and Cr: 0.0 1-0. At least one selected from the group consisting of 0.2% can further be contained. .
- the first to fourth copper-based alloy alloys include Sn: 0.1 to 2.5%, Sb: 0.02 to 0.25%, and A s: 0.02-0 as corrosion resistance improving elements. . It may further contain at least one selected from the group consisting of 5%.
- the alloy with finer crystal grains is further improved in corrosion resistance.
- Sn has the effect of improving erosion resistance and corrosion resistance.
- a protective film rich in Si and Sn is formed in corrosive solutions. And exhibits excellent corrosion resistance.
- addition of 0.1% or more is preferable.
- it exceeds 2.5% it is easy to bend, and since it is a low melting point metal, it is easy to cause forging cracks, and the ductility is lowered, so the upper limit is made 2.5%.
- a more preferable range is 0.2 to 0.9%.
- Sb and As have the effect of improving dezincification corrosion resistance.
- the content is increased, segregation is likely to occur, and since it is a low melting point metal, there is a problem of causing forging cracks.
- the ductility may be reduced. For this reason, the upper limit is 0.25%.
- the copper base alloy porcelain of the present invention has Pb: 0.004 to 0.45%, B i: 0.004 to 0.45%, Se: 0.03 to 0.45% and Te: It may further contain at least one selected from the group consisting of 0.01 to 0.45%.
- an alloy with finer crystal grains is further improved in machinability.
- the machinability can be improved.
- Pb, Bi, Se, and Te have a negative effect on the human body, and Bi, Se, and Te are not resource-rich elements. 3 is 0.45%, Bi is 0.45%, Se is 0.45%, and Te is 0.45%.
- the upper limit of these elements is preferably 0.2% or less.
- the inclusion of impurity elements inevitably included in the melting of the alloy is allowed.
- Fe and Ni as impurity elements, if there is a large content, Zr and P, which are useful for crystal grain refinement, are consumed by Fe and Ni, and grain refinement There is an inconvenience of inhibiting the action. Therefore, when Fe and / or Ni are contained as impurities, their content is Fe: 0.5% or less, N i: Specified to 0.5% or less.
- the content of Fe and Ni is preferably 0.25% or less, more preferably 0.15% or less for Fe, and 0.2% or less for Ni.
- the phase structure of the copper-based alloy product of the present invention is adjusted so that the total area ratio of the ⁇ phase, the c phase, and the phase is 80% or more. Adjusted to account for%. Note that the ⁇ phase and the a phase are higher in Si concentration than the phase. When these three phases do not reach 100%, the remainder generally consists of the i3 phase, the phase, and the ⁇ 5 phase. At least one of these phases is included.
- phase structure in which the total area ratio of this phase, ⁇ phase and phase is 80% or more, it is necessary to optimize the forging conditions such as the pouring temperature and cooling rate. This is also a condition necessary for reducing the average crystal grain size to about 100 m or less.
- the proportion of the ⁇ + phase is preferably 5 to 85%. More preferably, it is 10 to 80%.
- the proportion of the other phases and the proportion of the other phases exceed 20%, the primary crystal becomes a phase other than the ⁇ phase and the grain refinement cannot be achieved, and machinability and corrosion resistance are not achieved. Property, elongation and impact strength are reduced.
- the ⁇ phase is preferably 10% or less.
- the primary crystal is in phase.
- miniaturization is further promoted if the solid phase is a phase in the formation of crystal nuclei. This corresponds to the value 62.5 in the above formulas ⁇ ) to (4).
- the amount of the primary crystal phase is 20 to 30% or more, which corresponds to the value 64 in the formulas (1) to (4).
- at least a solid phase can exist at the time of solidification. This is the condition for miniaturization, and corresponds to the value 62.5 in equations (1) to (4). Even if the composition is slightly away from the value 62.5, the average grain size is large. However, it is still miniaturized, and its lower limit corresponds to the value 60 in equations (1) to (4).
- the value 71 in Equations (1) to (4) shows that it is difficult to make crystal grains ultrafine by reducing the amount of Zn added, and that there is a practical non-equilibrium in the solidification process. This is because it is not subject to the peritectic reaction in the state and the machinability is impaired.
- the solidification temperature range is widened. As the solidification temperature range becomes wider, coalescence of granular solid phases tends to occur, and dendrites are eventually in a dendritic form. In addition, no matter how fine the crystal grains are, cracks and nests are likely to occur, and the solid phase coalescence increases the number and size of blowholes and sinkholes.
- the most refinement of the crystal grains is achieved when the solidification phase is completed or a phase other than the ⁇ phase, mainly 3), or ⁇ , a phase is crystallized or precipitated.
- a phase is crystallized or precipitated.
- the non-phase, ⁇ , R, and ⁇ phases crystallize or precipitate, and if they exist, the growth of ⁇ crystal grains during the solidification stage and the cooling stage from high temperature is suppressed, and ultrafine processing is realized.
- the values of equations (1) to (4) are preferably 68.5 or less, Is most desirable.
- the values of equations (1) to (4) are: 60 or more is necessary, more preferably 62.5 or more, and most preferably 64 or more.
- the values of equations (1) to (4) need to be 71 or less, more preferably 68.5. In order to obtain industrially satisfactory machinability without containing Pb, 67 or less is most preferable.
- the copper-based alloy product of the present invention having a phase structure containing a total of 80% or more of the ⁇ phase, the / c phase and the a phase can be obtained by the following fabrication conditions.
- the upper limit of the pouring temperature is generally a temperature of 1 1550 ° C or lower or a liquidus temperature + 2500 ° C or lower, preferably 1100 ° C or lower, Preferably, it is performed at 1 0 5 0 or less.
- the lower limit of the pouring temperature is not particularly limited as long as the molten metal fills every corner of the mold, but is generally 90 ° to 95 ° C. just above the liquidus temperature. It should be understood that these temperature conditions vary depending on the alloy content.
- phase structure As described above, there is a close relationship between the phase structure and the above equation, and the temperature range of 500 ° C. immediately after the completion of solidification has the greatest influence on the phase transformation.
- value of the above formula is 62.5 or less, when cooling at an average cooling rate of 25 ° C./sec or more, a phase structure containing a total of 80% or more of ⁇ phase, ⁇ phase, and a phase is obtained. It becomes difficult.
- the alloy of the present invention can be crystallized by performing a general method and means for refining the porcelain, that is, by reducing the squeezing temperature, increasing the cooling rate, stirring in the solidification process, etc. Needless to say, the grains become finer.
- the term “containment” means a product that is completely or partially melted and solidified, including ingots, slabs, billets for rolling and extrusion, For example, sand casting, mold casting, low pressure casting, die casting, loss casting, semi-solid casting (eg thixocasting, rheocasting), squeeze, centrifugal casting, continuous casting (eg horizontal casting) Continuous forging, thermal spraying, overlaying and upwards, up-cast bars, hollow bars, deformed bars, deformed hollow bars, coiled materials, wire rods, etc.), melt forging (direct forging), spraying, meat Examples of such items include assortment, lining, and overlay. Furthermore, since welding also involves melting, solidifying, and joining a part of the base metal, it should be understood that it is included in the porcelain in a broad sense.
- the alloy materials having the compositions shown in Tables 1 to 3 were melted in an electric furnace and placed in a mold to obtain test materials.
- the filling temperature is 100 ° C.
- the preheating temperature of the mold is 200 ° C.
- the obtained specimen is a cylinder with a diameter of 40 mm and a length of 2880 mm.
- the area ratio of each phase constituting the phase structure was measured.
- the cylindrical specimen is cut parallel to the bottom surface at a position about 100 mm in the axial direction from the bottom surface, and the average grain size is determined at a position about 10 mm away from the center of the circle of the cut surface. It was measured.
- the measurement is performed based on the comparison method of the grain size test for wrought copper products of JISHO 5001, and after etching the cut surface with nitric acid, the crystal grain size of about 0.5 mm or more is magnified by the naked eye or 5x magnification.
- the crystal grain size smaller than about 0.5 mm was etched with a mixture of hydrogen peroxide and aqueous ammonia and observed with an optical microscope.
- the measurement position is about 1 O mm from the axis of the cut surface and about 10 O mm away from the bottom surface.
- test materials No. 1 to No. 4 4 shown in Table 1 and Table 2 are examples of the present invention, and the test materials No. 1 0 1 to No. 1 2 2 shown in Table 3 are comparisons. It is an example. In the comparative examples, the data shown in bold represents that the data deviates from the conditions defined by the copper base alloy product of the present invention.
- FIGS. 1 and 2 The phase structures of Invention Example No. 9 and Comparative Example No. 103 are shown in FIGS. 1 and 2, respectively.
- Fig. 1 shows a phase structure in which the ⁇ phase, ⁇ phase, and a phase are 100% in total, and the average crystal grain size is 15 m.
- FIG. 2 shows a phase structure in which the total of ⁇ ; phase, ⁇ phase, and a phase is 60%, ⁇ phase is present, and the average crystal grain size is 800 m.
- Comparative Examples No. 1 0 1 to No. 1 0 4 are examples in which the value of the relational expression is smaller than 60, and the total area ratio of the three phases is less than 80%, and the average crystal grain size is extremely low. It has become a big thing.
- Comparative Examples No. 1 0 5 to ⁇ ⁇ 1 0 8 are examples in which the value of the relational expression is larger than 71, and even if other conditions are within the specified range of the present invention, the average grain size The diameter is larger than 200 / m.
- Comparative Examples No. 1 2 0 and No. 1 2 1 are examples in which the total area ratio of the three phases is less than 80%, and the value of the relational expression is close to the lower limit specified in the present invention. However, the average crystal grain size is larger than 400 m.
- Comparative Example No. 1 0 9 does not contain Zr and P, and No. 1 1 0 and No. 1 1 1 1 are examples in which the content of Zr is less than that of the present invention. Since No. 1 1 0 and No. 1 1 1 have low Zr content, are the values of Si / Zr and P / Zr within the preferred range of the present invention? As a result, the average grain size is becoming very large.
- Comparative Examples No. 1 1 3 to No. 1 1 5 are examples in which the Zr content is higher than that of the present invention, and if the Zr content exceeds 0.05%, the crystal grain fineness It is shown that the result will be disturbed.
- FIG. 9A and FIG. 9B plot the relationship between the average crystal grain size and the Zr content.
- the value of the relational expression was limited to this range, as in No. 1 to No. 4 and No. 15 to No. 20 This is because the value has a great influence on the average crystal grain size, so that the influence is excluded.
- Comparative Example No. 1 1 5 is an example in which the P content is less than that of the present invention.
- Comparative Examples No. 1 1 6 and No. 1 1 7 are examples in which the Si content deviates from the provisions of the present invention. These have an average crystal grain size of 200 zm or more.
- Comparative Examples No. 1 1 8 and No. 1 1 9 indicate that the average grain size increases when Fe and Ni as impurities exceed the specified range of the present invention, respectively.
- Sample No. 8 of the invention example (average crystal grain size 25 xm), Test sample No. 1 1 5 of the comparative example (average crystal grain size 3 5 0 m), No. 1 1 0 (average crystal grain)
- Figure 5 shows the metal structures after etching a sample cooled with water from a solidification process (semi-molten state) with a solid phase ratio of 40% and a liquid phase ratio of 60%. As shown in FIG.
- specimen No. 8 In the solidification process (during melting and solidification), specimen No. 8 has no dendrite arm and is in the form of a circle or ellipse, whereas dendrites No. 1 1 5 and No. 1 1 0 Is a tooth-like form. Thus, No. 8 shows that crystal nucleation exceeded crystal grain growth (dendritic arm growth) and that crystal grain refinement was achieved (the matrix was semi-molten in a liquid state). A phase).
- the copper-based alloy of the present invention is particularly suitable for semi-molten (semi-solid) fabrication. If the solid phase is granular, the solid-liquid phase is not subjected to great resistance to every corner of the mold. It shows that it crosses over.
- Specimens No. 110, 111, and 112 were further heated to 750 ° C and subjected to hot extrusion at an extrusion ratio of 9 and a processing rate of 89% to obtain round bars with a diameter of 13.3 mm. Above, the average grain size and mechanical properties were measured.
- the specimens after hot extrusion of these specimens are shown as No. 1 10a, No. 1 1 1a and No. 1 12a, respectively.
- the mechanical property test was conducted by taking a No. 10 test piece specified in JISZ 2201 from the test material and conducting a tensile test with an Amsla type universal testing machine. Tensile strength, resistance (0.2%), Elongation and fatigue strength were measured. Table 5 shows the test results.
- No. 1 10 to No. 112 show that the crystal grain size is large at the stage after melting and solidification, but the crystal grain is refined to 30 / zm or less by hot extrusion.
- the mechanical properties after the crystal grains are refined by hot extrusion are almost the same as or rather inferior to those of the inventive examples after melting and solidification. From these results, it is clear that the mechanical properties depend on the average grain size. Therefore, the copper-based alloy product of the present invention in which the crystal grains are refined in the melt-solidification stage can have the same level of mechanical properties as those subjected to hot working without hot working. I understand.
- the dezincification corrosion test is based on ISO 6509. A sample collected from a test material is embedded in a phenol resin material, and the sample surface is polished to # 1200 with emiri paper, and then this is removed in pure water. Ultrasonic cleaning and drying. The corrosion test sample thus obtained was immersed in an aqueous solution (12.7 g, l) of 1.0% cupric chloride dihydrate (CuC 12 2H 2 0). After holding at 75 ° C for 24 hours, the sample was taken out from the aqueous solution and the maximum value of the dezincification corrosion depth (maximum dezincification corrosion depth) was measured. The results are shown in Table 7.
- the stress corrosion cracking test conforms to JISH 3250 and is a plate-shaped sample taken from the specimen.
- a sample (width 10 mm, length 60 mm, thickness 5 mm) is bent into a 45 degree V-shape (bending radius 5 mm) (adding residual tensile stress), degreased, After drying, it was kept in an ammonia atmosphere (25 ° C) in a dessert overnight containing 12.5% ammonia water (a solution of ammonia diluted with an equal amount of pure water). After holding (exposure) for a predetermined time as described below, the sample was taken out from Desike overnight, washed with 10% sulfuric acid, and then observed for cracking with a magnifier (10x magnification). Table 6 shows the observation results.
- the outer peripheral surface of the test material shown in Table 7 is a serious tool (rake angle: 1-6 °, nose radius: 0.4 With a lathe attached, the cutting speed was 100 m / min, the cutting depth was 1.5 mm, the feed was 0.1 lmm / re v., and the cutting was measured with a 3-component dynamometer attached to the cutting tool. Converted to main component. In addition, chips generated by cutting were collected, and the quality of the machinability was judged from the shape. In other words, the chips that are sheared into a fan-shaped piece or an arc-shaped piece with a half or less winding are the best in chip disposal and are indicated by ⁇ .
- Fine needle-shaped chips are indicated with a circle because they are easy to handle, but there are dangers such as obstacles to machine tools such as lathes and piercing workers' fingers.
- a spiral shape with more than 3 turns of chips has an adverse effect on the cutting processability, and there are inconveniences such as entanglement of the chips with the cutting tool and damage to the cut surface.
- chip processing is inferior, bite entanglement during continuous cutting, surface damage Since it may cause scratches, it is indicated by ⁇ .
- Ry is ideally close to the theoretical surface roughness, and less than 7.5 m is indicated by ⁇ . In order to obtain an industrially satisfactory cutting surface, Ry is 7.5 to 12 im, and X is the case where Ry exceeds 12 xm.
- the copper-based alloy of the present invention in which the crystal grains are refined at the time of melting and solidification can be suitably used, for example, as the following constituent member.
- Valves that require pressure resistance, wear resistance, machinability, and forgeability pump bodies, impellers, water supply taps, mixing taps, water supply valves, fittings, sprinklers, cocks, water meters, stopcocks, Sensor parts, scroll compressor parts, high pressure valves, sleeves pressure vessels;
- Bonding strength, overlaying, lining, overlay, corrosion resistance, forging are required Welding pipes for desalination equipment, water supply pipes, heat exchanger pipes, heat exchanger pipe plates, gas piping pipes, ELPO, marine structural materials, welding members, welding materials;
- Valve shoe, bag nut, header faucet parts that are required to have excellent pressure resistance, wear resistance, and machinability;
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Abstract
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Priority Applications (9)
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JP2006531272A JP3964930B2 (ja) | 2004-08-10 | 2005-05-02 | 結晶粒が微細化された銅基合金鋳物 |
AT05738890T ATE482294T1 (de) | 2004-08-10 | 2005-05-02 | Gussteil aus kupferbasislegierung mit raffinierten kristallkörnern |
US10/596,849 US20070169854A1 (en) | 2004-08-10 | 2005-05-02 | Copper-based alloy casting in which grains are refined |
CA2563094A CA2563094C (en) | 2004-08-10 | 2005-05-02 | Copper-based alloy casting in which grains are refined |
DK05738890.2T DK1777305T3 (da) | 2004-08-10 | 2005-05-02 | Støbning af kobberbaselegering med raffinerede krystalkorn |
EP05738890A EP1777305B1 (en) | 2004-08-10 | 2005-05-02 | Copper-base alloy casting with refined crystal grains |
DE602005023737T DE602005023737D1 (de) | 2004-08-10 | 2005-05-02 | Gussteil aus kupferbasislegierung mit raffinierten kristallkörnern |
MXPA06010613A MXPA06010613A (es) | 2004-08-10 | 2005-05-02 | Fundicion de aleacion basada en cobre con granos de cristal refinados. |
US16/033,689 US10570483B2 (en) | 2004-08-10 | 2018-07-12 | Copper-based alloy casting in which grains are refined |
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US16/033,689 Continuation US10570483B2 (en) | 2004-08-10 | 2018-07-12 | Copper-based alloy casting in which grains are refined |
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PCT/JP2005/014698 WO2006016630A1 (ja) | 2004-08-10 | 2005-08-10 | 銅合金鋳物及びその鋳造方法 |
PCT/JP2005/014687 WO2006016621A1 (ja) | 2004-08-10 | 2005-08-10 | 海水用構造物並びにこれを構成する線状若しくは棒状の銅合金材及びその製造方法 |
PCT/JP2005/014697 WO2006016629A1 (ja) | 2004-08-10 | 2005-08-10 | 被削性、強度、耐摩耗性及び耐蝕性に優れた銅合金鋳物及びその鋳造方法 |
PCT/JP2005/014678 WO2006016614A1 (ja) | 2004-08-10 | 2005-08-10 | 銅合金改質用マスターアロイおよびそれを用いる鋳造方法 |
PCT/JP2005/014691 WO2006016624A1 (ja) | 2004-08-10 | 2005-08-10 | 銅合金 |
PCT/JP2005/014699 WO2006016631A1 (ja) | 2004-08-10 | 2005-08-10 | Sn含有銅合金及びその製造方法 |
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PCT/JP2005/014687 WO2006016621A1 (ja) | 2004-08-10 | 2005-08-10 | 海水用構造物並びにこれを構成する線状若しくは棒状の銅合金材及びその製造方法 |
PCT/JP2005/014697 WO2006016629A1 (ja) | 2004-08-10 | 2005-08-10 | 被削性、強度、耐摩耗性及び耐蝕性に優れた銅合金鋳物及びその鋳造方法 |
PCT/JP2005/014678 WO2006016614A1 (ja) | 2004-08-10 | 2005-08-10 | 銅合金改質用マスターアロイおよびそれを用いる鋳造方法 |
PCT/JP2005/014691 WO2006016624A1 (ja) | 2004-08-10 | 2005-08-10 | 銅合金 |
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