CN114000038B - Modified 4Cr5MoSiV1 hot-work die steel and preparation method thereof - Google Patents

Modified 4Cr5MoSiV1 hot-work die steel and preparation method thereof Download PDF

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CN114000038B
CN114000038B CN202111290413.4A CN202111290413A CN114000038B CN 114000038 B CN114000038 B CN 114000038B CN 202111290413 A CN202111290413 A CN 202111290413A CN 114000038 B CN114000038 B CN 114000038B
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steel
cerium
furnace
vacuum
cooling
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CN114000038A (en
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杨礼林
赵莉萍
徐祺昊
秦晨
张慧敏
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Inner Mongolia University of Science and Technology
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/002—Hybrid process, e.g. forging following casting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium

Abstract

The invention belongs to the technical field of hot work die steel, and discloses modified 4Cr5MoSiV1 hot work die steel and a preparation method thereof, wherein the preparation method comprises the following steps: putting the weighed raw materials into a vacuum furnace, smelting to a molten state, adding a reducing agent, smelting at 1450-1550 ℃, casting under the protection of argon, and naturally cooling after casting to obtain a steel ingot; remelting the steel ingot by a protective atmosphere electroslag remelting technology, preserving heat at 1250 ℃, forging and cooling; and preserving the temperature of the steel at 850 ℃, and then cooling the steel to room temperature along with the furnace in sections to obtain the modified 4Cr5MoSiV1 hot work die steel. According to the invention, the rare earth intermediate alloy is added, and the yield of the rare earth in the steel is improved by utilizing the interaction of all components; the segregation of alloy elements such as Cr, Mo, V and the like at the crystal boundary is reduced, and the purpose of reducing dendrite segregation is achieved; improves the cast structure of the steel and improves the mechanical properties of the steel, such as fatigue life, and the like.

Description

Modified 4Cr5MoSiV1 hot-work die steel and preparation method thereof
Technical Field
The invention relates to the technical field of hot-work die steel, in particular to modified 4Cr5MoSiV1 hot-work die steel and a preparation method thereof.
Background
At present, in order to avoid failure modes such as fracture, plastic deformation, abrasion, softening, fatigue and the like of a hot working die in the process of processing and forming parts, the hot working die material is required to have excellent strength, toughness, plasticity, wear resistance and temper softening resistance.
4Cr5MoSiV1 hot work die steel (namely H13 steel) has the characteristics of excellent hardenability, good toughness, high wear resistance, good thermal fatigue and the like, and is often used as hot forging die steel. Although the combination properties are quite outstanding, the secondary hardening ability in tempering is poor, the hardness rapidly decreases when the use temperature is higher than 540 ℃ (1000 DEG F), and the deformation of heat treatment is small.
In addition, with the common application of high-speed, high-load and high-precision die forging equipment and high-strength and high-toughness forgings, the service conditions of a hot working die are worse, and the existing 4Cr5MoSiV1 hot working die steel can also lose efficacy due to the reasons in the using process.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides modified 4Cr5MoSiV1 hot work die steel and a preparation method thereof.
The invention relates to modified 4Cr5MoSiV1 hot-work die steel and a preparation method thereof, which are realized by the following technical scheme:
the first purpose of the invention is to provide a preparation method of modified 4Cr5MoSiV1 hot-work die steel, which comprises the following steps:
s1, weighing the preparation raw materials in percentage by weight:
0.32-0.45% of C, 0.8-1.20% of Si, 0.20-0.50% of Mn, 4.75-5.50% of Cr, 1.10-1.75% of Mo, 0.80-1.20% of V, 0.1-0.5% of rare earth alloy raw material and the balance of Fe;
s2, putting the weighed preparation raw materials into a vacuum furnace to be smelted to a molten state, adding a reducing agent, smelting at 1450-1550 ℃ for 3-7 min, casting under the protection of argon, and naturally cooling after casting to obtain a steel ingot;
s3, remelting the steel ingot obtained in the step S2 by adopting a protective atmosphere electroslag remelting technology, then preserving the temperature of the remelted steel ingot at 1250 ℃ for 20-30 h, and naturally cooling at room temperature to obtain a first steel;
s4, carrying out forging and pressing treatment on the obtained first steel, wherein the initial forging temperature of the forging and pressing treatment is 1200 ℃, the final forging temperature is not lower than 960 ℃, the forging ratio is more than 4, and the obtained first steel is naturally cooled at room temperature after forging to obtain a second steel;
s5, preserving the temperature of the second steel at 850 ℃ for 2h, and then cooling the second steel to room temperature in a furnace in sections to obtain the modified 4Cr5MoSiV1 hot work die steel.
Further, each preparation raw material was charged into a vacuum furnace according to the following steps:
placing the weighed Fe, Cr, Mo and V into a vacuum furnace, smelting at a temperature of more than 1500 ℃ until the Fe, Cr, Mo and V are molten, adding Si and C, preserving heat at 1600-1700 ℃ for 3-7 min, and then adding rare earth alloy to continue smelting until the rare earth alloy is molten.
Further, the rare earth alloy is cerium-iron alloy, and the cerium content in the cerium-iron alloy is 10-20% of the weight of the cerium-iron alloy.
Further, the cerium-iron alloy is prepared by the following steps:
respectively weighing metal cerium and iron according to the proportion that the cerium content is 10-20% of the weight of the cerium-iron alloy and the balance is Fe, placing the metal cerium and iron in a vacuum induction furnace with the vacuum degree of 0.1-100 Pa, smelting at 1550-1600 ℃, keeping the vacuum state for 4-6 min after the alloy is completely melted, removing the vacuum, then casting under the protection of argon, and naturally cooling after casting is finished to obtain the cerium-iron alloy.
Further, the segmented furnace cooling is to keep the temperature of the second steel material at 850 ℃ for 2h, slowly cool the second steel material along with the furnace to 750 ℃ and keep the temperature for 5h, then slowly cool the second steel material along with the furnace to 600 ℃ at a temperature of less than or equal to 15 ℃/h, then slowly cool the second steel material along with the furnace to 500 ℃ at a temperature of less than or equal to 10 ℃/h, and then slowly cool the second steel material along with the furnace to room temperature, so that the modified 4Cr5MoSiV1 hot work die steel is obtained.
Further, in S2, the vacuum furnace is a vacuum induction furnace, and the vacuum degree is 0.05-10 Pa.
Further, the reducing agent is metal Al with the purity of more than 99%.
Furthermore, the mass ratio of the reducing agent to the total amount of the preparation raw materials is 0.05-0.15% to 1.
Further, the casting under the protection of argon refers to:
alloy melting is finished under vacuum, a side door of a vacuum chamber is opened, then an annular steel pipe filled with argon protective gas is horizontally placed at a furnace mouth of an induction furnace and is 50-100 mm higher than the furnace mouth, small holes with the diameter of 2-3 mm are densely arranged on the inner side of the argon annular steel pipe, the center distance of the small holes is 10-20 mm, the argon outflow direction of the small holes horizontally points to the center of an upper mouth of the induction furnace, and the total gas flow is 300-800L/min.
Further, in S2, the vacuum furnace is a vacuum induction furnace, and the vacuum degree is 0.05-10 Pa.
Further, in S2, in the smelting process, the residual quantity of rare earth elements in the molten steel is controlled to be 0.001-0.020%, and the oxygen content in the molten steel is controlled to be below 20 ppm; the residual amount of the rare earth elements in the molten steel refers to the content of the rare earth elements in the whole molten steel.
The second purpose of the invention is to provide 4Cr5MoSiV1 hot-work die steel prepared according to the preparation method.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, other alloy raw materials are sequentially smelted, and then the rare earth element is added in a cerium-iron alloy manner, so that compared with the addition of pure rare earth, the yield of rare earth in steel is obviously improved; and the yield of rare earth in steel is improved; by adding the cerium-iron alloy, the invention leads the 4Cr5MoSiV1 steel to be refined in the structure of cast state, forged state and normalized state, and not only leads the Al which is very small in amount and is mixed in the steel to be very fine2O3And MnS inclusion is denatured into fine spherical rare earth inclusions which are formed by RE and O, S and are dispersed and distributed; the segregation of alloy elements such as Cr, Mo, V and the like at the grain boundary is reduced, and the aim of reducing dendritic crystal segregation can be fulfilled; improves the cast structure of the 4Cr5MoSiV1 steel, and improves the mechanical properties of the 4Cr5MoSiV1 steel, such as fatigue life, and the like.
Drawings
FIG. 1 is a schematic view of a sample structure when an impact toughness test is performed according to the present invention;
FIG. 2 is a schematic diagram of a sample structure during a tensile property test according to the present invention;
FIG. 3 is a structural diagram of an as-cast hot mold steel of the present invention; FIG. 3(a) is a structural diagram of as-cast hot mold steel of comparative example 2 according to the present invention; FIG. 3(b) is a structural view of as-cast hot mold steel according to example 1 of the present invention;
FIG. 4 is a microstructure diagram of a spheroidizing annealed hot mold steel according to the present invention; FIG. 4(a) is a structural diagram of a spheroidizing annealed hot mold steel according to comparative example 2 of the present invention; FIG. 4(b) is a structural diagram of a spheroidizing annealed hot mold steel according to example 1 of the present invention;
FIG. 5 is a structural view of the hot die steel in a forged state of the present invention; FIG. 5(a) is a structural view of a hot die steel of comparative example 2 of the present invention in a forged state; FIG. 5(b) is a structural view of a hot die steel in a forged state according to example 1 of the present invention;
FIG. 6 is an elemental distribution diagram of inclusions in the hot die steel of example 1; fig. 6(a) is an element distribution diagram of spherical Ce sulfide in the hot die steel of example 1; fig. 6(b) is an element distribution diagram of sulfur oxides of spherical Ce in the hot die steel of example 1;
FIG. 7 elemental distribution diagram of inclusions in hot die steel of comparative example 2; FIG. 7(a) is an element distribution diagram of spherical Al oxides included in the hot die steel of comparative example 2; FIG. 7(b) is an element distribution diagram of a bulk Mn sulfide inclusion in the hot die steel of comparative example 2; fig. 7(c) and 7(d) are element distribution diagrams of the VC-CrC-MoC in the form of a strip or block included in the hot die steel of the comparative example 2.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Example 1
The embodiment provides a preparation method of modified 4Cr5MoSiV1 hot work die steel, which comprises the following steps:
s1, weighing the preparation raw materials in percentage by weight:
0.35% of C, 1.18% of Si, 0.46% of Mn, 4.88% of Cr, 1.57% of Mo, 1.19% of V, 0.3% of cerium-iron alloy and the balance of Fe.
S2, firstly, placing the weighed Fe, Cr, Mo and V into a vacuum furnace, smelting at 1500 ℃ until the weighed Fe, Cr, Mo and V are molten, then adding the weighed Si and C, keeping the temperature at 1650 ℃ for 5min, then adding the weighed rare earth alloy for continuous smelting, controlling the residual quantity of the rare earth elements in the steel to be 0.018%, and controlling the oxygen content in the steel to be 20 ppm;
s3, weighing Al according to 0.1% of the total amount of each preparation raw material, adding the Al into a vacuum furnace smelted in S2, controlling the temperature to be 1500 ℃, smelting for 5min, and then casting under the protection of argon gas to ensure that the oxygen content in steel is 20 ppm; naturally cooling after casting to obtain a steel ingot;
s4, remelting the steel ingot obtained in the step S3 by adopting a protective atmosphere electroslag remelting technology, and homogenizing the remelted steel ingot at 1250 ℃ for 25 hours to obtain a first steel material;
s5, carrying out forging treatment on the obtained first steel material, wherein the initial forging temperature of the forging treatment is 1200 ℃, the final forging temperature is 960 ℃, the forging ratio is 6, and air cooling is carried out after the forging treatment to obtain a second steel material;
s6, keeping the temperature of the second steel at 850 ℃ for 2h, slowly cooling to 750 ℃, keeping the temperature for 5h, then slowly cooling to 600 ℃ at 15 ℃/h, then slowly cooling to 500 ℃ at 10 ℃/h, and furnace cooling to obtain the modified 4Cr5MoSiV1 hot work die steel.
In this embodiment, the cerium-iron alloy is prepared by the following steps:
respectively weighing metal cerium and iron according to the proportion that the cerium content is 15 percent of the weight of the cerium-iron alloy and the balance is Fe, putting the metal cerium and iron into a vacuum induction furnace with the vacuum degree of 50Pa, smelting at 1570 ℃, keeping the vacuum state for 5min after the alloy is completely melted, removing the vacuum, then casting under the protection of argon, and naturally cooling after the casting is finished to obtain the cerium-iron alloy.
Example 2
The embodiment provides a preparation method of modified 4Cr5MoSiV1 hot-work die steel, which comprises the following steps:
s1, weighing the preparation raw materials in percentage by weight:
0.32 percent of C, 0.8 percent of Si, 0.2 percent of Mn, 4.75 percent of Cr, 1.10 percent of Mo, 0.8 percent of V, 0.1 percent of cerium-iron alloy and the balance of Fe.
S2, firstly, placing the weighed Fe, Cr, Mo and V into a vacuum furnace, smelting at 1550 ℃ until the weighed Fe, Cr, Mo and V are molten, then adding the weighed Si and C, keeping the temperature at 1600 ℃ for 7min, then adding the weighed rare earth alloy for continuous smelting, controlling the residual quantity of the rare earth elements in the steel to be 0.001%, and controlling the oxygen content in the steel to be 15 ppm;
s3, weighing Al according to 0.05% of the total amount of each preparation raw material, adding the Al into a vacuum furnace smelted in S2, smelting at 1450 ℃ for 3min, and then casting under the protection of argon to ensure that the oxygen content in the steel is 15 ppm; naturally cooling after the casting is finished to obtain a steel ingot;
s4, remelting the steel ingot obtained in the step S3 by adopting a protective atmosphere electroslag remelting technology, and then homogenizing the remelted steel ingot at 1250 ℃ for 20 hours to obtain a first steel material;
s5, carrying out forging treatment on the obtained first steel material, wherein the initial forging temperature of the forging treatment is 1200 ℃, the final forging temperature is 960 ℃, the forging ratio is 5, and air cooling is carried out after the forging treatment to obtain a second steel material;
s6, keeping the temperature of the second steel at 850 ℃ for 2h, slowly cooling to 750 ℃, keeping the temperature for 5h, then slowly cooling to 600 ℃ at 10 ℃/h, then slowly cooling to 500 ℃ at 5 ℃/h, and furnace cooling to obtain the modified 4Cr5MoSiV1 hot work die steel.
In this embodiment, the cerium-iron alloy is prepared by the following steps:
respectively weighing metal cerium and iron according to the proportion that the cerium content is 10 percent of the weight of the cerium-iron alloy and the balance is Fe, putting the metal cerium and iron into a vacuum induction furnace with the vacuum degree of 100Pa, smelting at 1550 ℃, keeping the vacuum state for 4min after the alloy is completely melted, then removing the vacuum, then casting under the protection of argon, and naturally cooling after the casting is finished to obtain the cerium-iron alloy.
Example 3
The embodiment provides a preparation method of modified 4Cr5MoSiV1 hot work die steel, which comprises the following steps:
s1, weighing the preparation raw materials in percentage by weight:
0.45 percent of C, 1.2 percent of Si, 0.5 percent of Mn, 5.50 percent of Cr, 1.75 percent of Mo, 1.2 percent of V, 0.5 percent of cerium-iron alloy and the balance of Fe.
S2, firstly, placing the weighed Fe, Cr, Mo and V into a vacuum furnace, smelting at 1600 ℃ until the weighed Fe, Cr, Mo and V are molten, then adding the weighed Si and C, preserving the heat at 1700 ℃ for 7min, then adding the weighed rare earth alloy for continuous smelting, controlling the residual quantity of the rare earth elements in the steel to be 0.02 percent, and controlling the oxygen content in the steel to be 18 ppm;
s3, weighing Al according to 0.15% of the total amount of each preparation raw material, adding the Al into a vacuum furnace smelted in S2, controlling the temperature to be 1550 ℃ for smelting for 7min, and then casting the Al under the protection of argon to ensure that the oxygen content in steel is 18 ppm; naturally cooling after the casting is finished to obtain a steel ingot;
s4, remelting the steel ingot obtained in the step S3 by adopting a protective atmosphere electroslag remelting technology, and homogenizing the remelted steel ingot at 1250 ℃ for 30 hours to obtain a first steel;
s5, carrying out forging treatment on the obtained first steel, wherein the initial forging temperature of the forging treatment is 1200 ℃, the final forging temperature is 1000 ℃, the forging ratio is 5, and air cooling is carried out after the forging treatment to obtain a second steel;
s6, keeping the temperature of the second steel at 850 ℃ for 2h, slowly cooling the second steel to 750 ℃ along with the furnace, keeping the temperature for 5h, then slowly cooling the second steel to 600 ℃ at 12 ℃/h, then slowly cooling the second steel to 500 ℃ at 7 ℃/h, and furnace cooling to obtain the modified 4Cr5MoSiV1 hot work die steel.
In this embodiment, the cerium-iron alloy is prepared by the following steps:
respectively weighing metal cerium and iron according to the proportion that the cerium content is 20 percent of the weight of the cerium-iron alloy and the balance is Fe, putting the metal cerium and iron into a vacuum induction furnace with the vacuum degree of 1Pa, smelting at 1600 ℃, keeping the vacuum state for 6min after the alloy is completely melted, then removing the vacuum, then casting under the protection of argon, and naturally cooling after the casting is finished to obtain the cerium-iron alloy.
Comparative example 1
The only difference from example 1 is that the rare earth alloy raw material in comparative example 1 is added in the form of pure Ce, and the amount of pure Ce added is the same as the cerium content in the cerium-iron alloy added in example 1.
Comparative example 2
The only difference from example 1 is that no cerium-iron alloy was added.
Test section
In order to verify the properties of the hot work die steel manufactured by the method of the present invention, the hot work die steels of example 1 and comparative example 1 were subjected to the following tests:
(I) impact toughness test
The hot work die steels of example 1 and comparative example 1 were processed into test piece sizes of 10mm × 10mm × 55mm by the same processing method, and were each processed with a U-shaped notch having a diameter of 1mm "as shown in fig. 1. Then, the samples of example 1 and comparative example 1 were subjected to Charpy pendulum impact test with reference to GB/T229-2007, and the impact toughness results of the two samples are shown in Table 1.
Impact toughness of the samples of Table 1
Impact toughness (Ak, J/cm)2)
Comparative example ≥8
Test examples ≥10
(II) tensile Property test
The hot-work die steels of example 1 and comparative example 1 were processed to the sample size shown in FIG. 2, wherein Φ was1＝8mm，Φ2＝14mm，L0＝40mm，Lc＝50mm，Lt＝82mmAnd R is 3 mm. Then, the samples of example 1 and comparative example 1 were stretched on a WDW3200 type micro-control electronic universal tester with reference to the national standard GB/T228.1-2010, the constant pulling speed adopted in the test process was 0.50mm/min, and the tensile properties of the two samples obtained by the test are shown in Table 2.
TABLE 2 tensile Properties of the samples
Figure BDA0003334509670000091
Effect of (III) Ce on the Properties of 4Cr5MoSiV1 Steel
The present invention takes the samples of example 1 and comparative example 2 in the as-cast state, normalized state, spheroidized annealed state and forged state, respectively, and the results are shown in fig. 3, fig. 4, fig. 5 and fig. 6, respectively, when they are observed under an electron microscope.
It can be seen that the rare earth elements are added in the cerium-iron alloy mode, and compared with the method of adding pure rare earth, the method obviously improves the yield of the rare earth in the steel. Meanwhile, the grains of the structure of the 4Cr5MoSiV1 steel in the casting state, the forging state and the normalizing state are refined, the degree of segregation of alloy elements is reduced, and the as-cast structure is improved; the inclusion type in the die steel is also changed into rare earth inclusion by inclusion of Al oxide and Mn sulfide, thereby improving the obdurability, thermal stability and fatigue resistance of the 4Cr5MoSiV1 matrix steel. And by adding rare earth Ce. The type of the inclusions is changed, the size of the inclusions is reduced, and the morphology of the inclusions tends to be spherical.
It is to be understood that the above-described embodiments are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

Claims (4)

1. A preparation method of modified 4Cr5MoSiV1 hot work die steel is characterized by comprising the following steps:
s1, weighing the following raw materials in percentage by weight:
0.32-0.45% of C, 0.8-1.20% of Si, 0.20-0.50% of Mn, 4.75-5.50% of Cr, 1.10-1.75% of Mo, 0.80-1.20% of V, 0.1-0.5% of rare earth alloy raw material and the balance of Fe;
s2, putting the weighed preparation raw materials into a vacuum furnace to be smelted to a molten state, adding a reducing agent, smelting at 1450-1550 ℃ for 3-7 min, casting under the protection of argon, and naturally cooling after casting to obtain a steel ingot;
s3, remelting the steel ingot obtained in the step S2 by adopting a protective atmosphere electroslag remelting technology, then preserving the temperature of the remelted steel ingot at 1250 ℃ for 20-30 h, and naturally cooling at room temperature to obtain a first steel;
s4, carrying out forging and pressing treatment on the obtained first steel, wherein the initial forging temperature of the forging and pressing treatment is 1200 ℃, the final forging temperature is not lower than 960 ℃, the forging ratio is more than 4, and the obtained first steel is naturally cooled at room temperature after forging to obtain a second steel;
s5, preserving the temperature of the second steel at 850 ℃ for 2h, and then cooling the second steel to room temperature in a furnace in sections to obtain the modified 4Cr5MoSiV1 hot-work die steel;
the preparation raw materials are added into a vacuum furnace according to the following steps:
placing the weighed Fe, Cr, Mo and V into a vacuum furnace, smelting at the temperature of more than 1500 ℃ until the Fe, Cr, Mo and V are molten, then adding the weighed Si and C, preserving the heat at 1600-1700 ℃ for 3-7 min, and then adding rare earth alloy to continue smelting to a molten state;
the rare earth alloy raw material is cerium-iron alloy, and the cerium content in the cerium-iron alloy is 10-20% of the weight of the cerium-iron alloy;
the reducing agent is Al;
the cerium-iron alloy is prepared by the following steps:
respectively weighing metal cerium and iron according to the proportion that the cerium content is 10-20% of the weight of the cerium-iron alloy and the balance is Fe, placing the metal cerium and iron in a vacuum induction furnace with the vacuum degree of 1-100 Pa, smelting at 1550-1600 ℃, keeping the vacuum state for 4-6 min after the alloy is completely melted, removing the vacuum, then casting under the protection of argon, and naturally cooling after casting is finished to obtain the cerium-iron alloy;
the segmented furnace cooling is to perform heat preservation on the second steel at 850 ℃ for 2h, then perform furnace slow cooling to 750 ℃ and perform heat preservation for 5h, then perform furnace slow cooling to 600 ℃ at a speed of less than or equal to 15 ℃/h, then perform furnace slow cooling to 500 ℃ at a speed of less than or equal to 10 ℃/h, and perform furnace cooling to room temperature, thus obtaining the modified 4Cr5MoSiV1 hot work die steel;
the mass ratio of the reducing agent to the total amount of all the preparation raw materials is 0.05-0.15: 1.
2. The method according to claim 1, wherein in S2, the vacuum furnace is a vacuum induction furnace and the degree of vacuum is 0.05-10 Pa.
3. The method of claim 1, wherein in S2, during the melting process, the residual rare earth element content in the molten steel is controlled to be 0.001-0.020%, and the oxygen content in the molten steel is controlled to be less than 20 ppm.
4. A modified 4Cr5MoSiV1 hot work die steel prepared by the method of any one of claims 1 to 3.
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