CN103131964A - Method for improving as-cast structure homogeneity of X12CrMoWVNbN10-1-1 martensitic stainless steel - Google Patents
Method for improving as-cast structure homogeneity of X12CrMoWVNbN10-1-1 martensitic stainless steel Download PDFInfo
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Abstract
The invention discloses a method for improving as-cast structure homogeneity of X12CrMoWVNbN10-1-1 martensitic stainless steel, which comprises the following steps: configuring an alloy, preheating a casting mold, heating the alloy, performing superheating treatment on the alloy liquid, and casting the alloy, thus obtaining a stainless steel cast ingot which is homogeneous and fine in structure. According to the method disclosed by the invention, the as-cast structure homogeneity of stainless steel can be greatly improved, the equiaxed crystal zone proportion is increased, and grains are refined, thereby being beneficial to enhance the comprehensive mechanical property of X12CrMoWVNbN10-1-1 martensitic stainless steel. The process disclosed by the invention is simple, and the as-cast structure homogeneity of X12CrMoWVNbN10-1-1 martensitic stainless steel can be effectively controlled by simply optimizing casting process parameters; and the process is easy to operate and control, and is suitable for industrial production.
Description
Technical field
The present invention relates to a kind of inhomogeneity method of the X12CrMoWVNbNl0-1-1 of improvement Martensite Stainless Steel as-cast structure, relate in particular to a kind of raising X12CrMoWVNbN10-1-1 Martensite Stainless Steel as-cast structure proportion of equiaxed grain, crystal grain thinning, improve the inhomogeneity method of as-cast structure; Belong to ingot casting casting technique field.
Background technology
The X12CrMoWVNbN10-1-1 Martensite Stainless Steel is widely used on Nuclear power plants and power station, ore deposit generating rotor material owing to having good corrosion resistance nature, hot strength and creep-resistant property, and its chemical composition is as shown in table 1.The domestic X12CrMoWVNbN10-1-1 nuclear power rotor steel that uses almost all relies on import at present, therefore produces the tiny ingot casting of homogeneous microstructure very urgent.
Table 1.X12CrMoWVNbN10-1-1 Martensite Stainless Steel chemical composition (wt%)
The inhomogeneity method of raising as-cast structure of generally using in industrial production mainly contains two kinds: method of chemical treatment (namely breed and go bad) and Physical (namely applying mechanical vibration, electric and magnetic oscillation, ultrasonic vibration etc.).Yet, fact proved although chemical method and Physical can the refinement ingot structures, all to have certain limitation.Method of chemical treatment fining agent complicated process of preparation for example, thus cause production cost to improve, and easily mother alloy is polluted (especially strict to composition alloy system).Physical is to equipment requirements is too high and effect is limited.
Therefore, those skilled in the art be devoted to develop a kind of with low cost, simply improve the inhomogeneity method of X12CrMoWVNbN10-1-1 Martensite Stainless Steel as-cast structure.
Summary of the invention
Because the defects of prior art, technical problem to be solved by this invention is to provide a kind of technique and simply improves the inhomogeneity method of X12CrMoWVNbN10-1-1 Martensite Stainless Steel as-cast structure.
For achieving the above object, the invention provides a kind of inhomogeneity method of the X12CrMoWVNbN10-1-1 of improvement Martensite Stainless Steel as-cast structure, method of the present invention is upper as-cast structure proportion of equiaxed grain, the crystal grain thinning of improving largely, thereby improves the comprehensive mechanical property of ingot casting.
The concrete steps of the inhomogeneity method of the X12CrMoWVNbN10-1-1 of improvement Martensite Stainless Steel as-cast structure of the present invention comprise:
1, configuration alloy
Require the configuration alloy raw material according to the composition of alloy: taking respectively carbon dust, extra low carbon ferrochromium, nitrided ferro-chromium, ferro-niobium, ferrotungsten, molybdenum-iron, vanadium iron, ferromanganese and pure nickel is alloy raw material; Due to the easy scaling loss of element such as Elements C, Cr, Mn in alloy, therefore these elements all configure by the upper limit of the requirement of alloying constituent shown in table 1, preferably, in alloy raw material, the ratio of C, N, Mn, Cr, Ni, Mo, W, V, Tb is 13:6:50:1060:80:110:100:20:5;
2, preheating casting mold
Casting mold is carried out preheating, and its preheating temperature is 750 ℃～900 ℃;
3, add thermalloy and alloy liquid carries out Overheating Treatment
Adopt the medium-frequency induction furnace alloy to heat, alloy liquid carries out Overheating Treatment after alloy melting, and the alloy superheat temperature is controlled between 1600 ℃～1650 ℃, between overheated time 3～10min;
4, cast alloys
After the alloy melt Overheating Treatment finished, stopped heating, made aluminium alloy cooling rapidly immediately, casts when alloy temperature drops to 1580 ℃～1610 ℃, can obtain the tiny ingot casting of homogeneous microstructure.
In better embodiment of the present invention, in alloy, 13:1060:110 is compared in the configuration of Elements C, Cr, Mn.
In another better embodiment of the present invention, for degasification, anti-oxidation, whole process is all to carry out in a vacuum.Especially molten alloy described in step 3) and alloy liquid carry out the Overheating Treatment process and all carry out under 30～100Pa.
Method of the present invention has following advantage:
The inhomogeneity method of the X12CrMoWVNbN10-1-1 of improvement Martensite Stainless Steel as-cast structure of the present invention can be improved X12CrMoWVNbN10-1-1 Martensite Stainless Steel as-cast structure homogeneity largely, especially can upward improve largely proportion of equiaxed grain, crystal grain thinning.Method of the present invention is simple, only needs to optimize casting technological parameter (melt overheat temperature, casting mold preheating temperature, pouring temperature), can realize the inhomogeneity effective control of X12CrMoWVNbN10-1-1 Martensite Stainless Steel as-cast structure.Adopt processing method of the present invention, can increase largely equiax crystal regional percentage in as-cast structure, thereby obtain the tiny Stainless Steel Alloy ingot casting of homogeneous microstructure, be conducive to improve the comprehensive mechanical property of X12CrMoWVNbN10-1-1 Martensite Stainless Steel.Technique of the present invention is simple, is easy to control, and is suitable for industrialized popularization and use.
Be described further below with reference to the technique effect of accompanying drawing to design of the present invention, concrete structure and generation, to understand fully purpose of the present invention, feature and effect.
Description of drawings
Fig. 1 is the X12CrMoWVNbN10-1-1 Martensite Stainless Steel as cast condition macrostructure that embodiments of the invention 1 obtain;
Fig. 2 is the X12CrMoWVNbN10-1-1 Martensite Stainless Steel as-cast microstructure that embodiments of the invention 1 obtain.
Embodiment
The inhomogeneity method of X12CrMoWVNbN10-1-1 Martensite Stainless Steel as-cast structure upper proportion of equiaxed grain, the crystal grain thinning of improving largely that improve of the present invention.In the specific embodiment of the present invention, described method only need determine casting process parameter (melt overheat temperature, casting mold preheating temperature, pouring temperature), can realize the inhomogeneity effective control of X12CrMoWVNbN10-1-1 Martensite Stainless Steel as-cast structure.
In specific embodiments of the invention, the medium-frequency induction furnace that uses is this area instrument commonly used, and the present invention is not particularly limited this.
Embodiment 1
1, configuration alloy
The raw material of configuration alloy is: carbon dust, extra low carbon ferrochromium, nitrided ferro-chromium, ferro-niobium, ferrotungsten, molybdenum-iron, vanadium iron, ferromanganese and pure nickel, wherein, in alloy, the ratio of Elements C, N, Mn, Cr, Ni, Mo, W, V, Tb is 13:6:50:1060:80:110:100:20:5, and the gross weight of alloy is 10Kg;
2, casting mold is carried out preheating
Casting mold is made into take 400 purposes industry magnesia and silicon sol as raw material, and mould dimension is φ 100mm * 200mm, casting mold is put into resistance furnace carry out preheating, and preheating temperature is set as 800 ℃;
3, add thermalloy and alloy solution carries out Overheating Treatment
Utilize the medium-frequency induction furnace alloy to heat, until after alloy melting, alloy liquid carries out Overheating Treatment, temperature of superheat is 1630 ℃, and the overheated time is 5min.
4, cast alloys
After the aluminium alloy Melt Overheating Treatment finishes, close medium-frequency induction furnace, make alloy cooling rapidly, when dropping to 1600 ℃, alloy temperature casts, obtain the tiny ingot casting of homogeneous microstructure, the as cast condition macrostructure of this X12CrMoWVNbN10-1-1 Martensite Stainless Steel ingot casting as shown in Figure 1, as-cast microstructure is as shown in Figure 2.
5, ingot casting detects
The ingot casting that makes is taken out, vertically cuts open along diameter, with sand paper with surface grinding after, corrode with chloroazotic acid.After testing, in ingot macrostructure, the remove feeder position, all the other are all the equiax crystal district, and the equiax crystal district has surpassed 60% of whole ingot casting volume, and the equiax crystal diameter is less than 1.100m.
More than describe preferred embodiment of the present invention in detail.The ordinary skill that should be appreciated that this area need not creative work and just can design according to the present invention make many modifications and variations.Therefore, all technician in the art all should be in the determined protection domain by claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (3)
1. one kind is improved the inhomogeneity method of X12CrMoWVNbNl0-1-1 Martensite Stainless Steel as-cast structure, it is characterized in that, comprises the steps:
Step 1) configuration alloy
Take carbon dust, extra low carbon ferrochromium, nitrided ferro-chromium, ferro-niobium, ferrotungsten, molybdenum-iron, vanadium iron, ferromanganese and pure nickel as alloy raw material, require described each alloy raw material of configuration according to the X12CrMoWVNbNl0-1-1 alloying constituent respectively;
Step 2) preheating casting mold
Adopt sand mo(u)ld to be casting mold and it is carried out preheating, described preheating temperature is 750 ℃～900 ℃;
Step 3) adds thermalloy and alloy liquid carries out Overheating Treatment
Alloy heats, and alloy liquid carries out Overheating Treatment again after its fusing, and the alloy superheat temperature is 1600 ℃～1650 ℃, overheated time 3～10min;
The step 4) cast alloys
After described alloy melt Overheating Treatment finishes, stopped heating immediately, cooling described aluminium alloy, cast when temperature drops to 1580 ℃～1610 ℃ rapidly, obtains the tiny ingot casting of homogeneous microstructure.
2. the method for claim 1, wherein molten alloy described in step 3) and alloy liquid carry out the Overheating Treatment process and all carry out under 30～100Pa.
3. when the method for claim 1, wherein configuring each raw material, in described alloy, the mass ratio of C, N, Mn, Cr, Ni, Mo, W, V, Tb is 13:6:50:1060:80:110:100:20:5.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111187930A (en) * | 2020-02-28 | 2020-05-22 | 沈阳金纳新材料股份有限公司 | Method for improving intermetallic compound in casting alloy |
| CN112626413A (en) * | 2020-11-28 | 2021-04-09 | 四川维珍高新材料有限公司 | Aviation case product and production process thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58217664A (en) * | 1982-06-11 | 1983-12-17 | Toshiba Corp | Steam turbine blade |
| CN1388266A (en) * | 2002-03-19 | 2003-01-01 | 上海交通大学 | Parallel integrated melt hot treating process and test method |
| CN101831535A (en) * | 2009-03-12 | 2010-09-15 | 上海重型机器锻件厂 | Heat treatment method after forging of ultra-supercritical high and medium pressure rotor steel |
-
2013
- 2013-03-26 CN CN201310101298.0A patent/CN103131964B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58217664A (en) * | 1982-06-11 | 1983-12-17 | Toshiba Corp | Steam turbine blade |
| CN1388266A (en) * | 2002-03-19 | 2003-01-01 | 上海交通大学 | Parallel integrated melt hot treating process and test method |
| CN101831535A (en) * | 2009-03-12 | 2010-09-15 | 上海重型机器锻件厂 | Heat treatment method after forging of ultra-supercritical high and medium pressure rotor steel |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111187930A (en) * | 2020-02-28 | 2020-05-22 | 沈阳金纳新材料股份有限公司 | Method for improving intermetallic compound in casting alloy |
| CN111187930B (en) * | 2020-02-28 | 2021-10-01 | 沈阳金纳新材料股份有限公司 | Method for improving intermetallic compound in casting alloy |
| CN112626413A (en) * | 2020-11-28 | 2021-04-09 | 四川维珍高新材料有限公司 | Aviation case product and production process thereof |
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