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A kind of rare earth die steel and its preparation method

A die steel and rare earth technology, applied in the field of die steel, can solve the problems of limited microalloying of rare earth elements and inability to obtain impact toughness rare earth die steel, etc.

Active Publication Date: 2022-04-22
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the difference in atomic radius between rare earth elements and iron elements limits the microalloying effect of rare earth elements, especially in controlling the phase transformation during cooling, and there is still insufficient suppression of non-martensitic structures, so that it is impossible to obtain high impact alloys. Tough and highly isotropic rare earth tool steel

Method used

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  • A kind of rare earth die steel and its preparation method
  • A kind of rare earth die steel and its preparation method
  • A kind of rare earth die steel and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Composition (mass percentage): C: 0.39%, Si: 0.85%, Mn: 0.38%, Cr: 4.98%, Mo: 1.48%, V: 0.89%, O: 0.0012%, S: 0.002%, P: 0.011% , H: 0.004%, Y: 0.009%, Mg: 0.003%, B: 0.003% and the balance Fe.

[0059] making process:

[0060] (1) Carry out converter smelting and LF refining of other component raw materials except Y and Mg elements, then carry out VD refining treatment, feed yttrium-magnesium intermediate alloy wire at the same time, and finally carry out continuous casting to obtain continuous casting slabs; , the feeding speed of the yttrium-magnesium intermediate alloy wire is 3m / s, the flow rate of argon gas during the wire feeding process is 80L / min, and the flow rate of argon gas after the wire feeding is 50L / min, and the whole process is treated by blowing argon; The mass content of Y in the alloy wire is 30%, and the mass content of Mg is 70%;

[0061] (2) Carry out electroslag remelting treatment, homogenization treatment and multi-directional hot forging to...

Embodiment 2

[0066] The difference from Example 1 is that Y: 0.007%, Mg: 0.004%, B: 0.004%, and the rest are the same as Example 1.

Embodiment 3

[0068] The difference from Example 1 is that Y: 0.008%, Mg: 0.003%, B: 0.002%, and the rest are the same as Example 1.

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Abstract

The invention belongs to the technical field of die steel and provides a rare earth die steel. By adding Mg and B elements on the basis of adding rare earth element Y, the grain boundaries of Mg and B are fully utilized while playing the role of rare earth elements in purifying the matrix. position, realizes the control of grain boundary reticular chromium-based carbides; moreover, B element can fully improve the hardenability of austenite, ensuring that non-martensitic phases such as bainite will not appear during the cooling process, and thus obtained Rare earth tool steel with high impact toughness and high isotropy. The results of the examples show that the rare earth mold steel provided by the present invention has a band segregation degree of As1, an inclusion level of level 1, a longitudinal impact energy of 16.2J, a transverse impact energy of 14.4J, and an isotropy of 0.88.

Description

technical field [0001] The invention relates to the technical field of die steel, in particular to a rare earth die steel and a preparation method thereof. Background technique [0002] Hot work die steel has high strength and good wear resistance, and is widely used in hammer forging dies, hot extrusion dies, die-casting dies and other molds. There is still a certain gap between hardness and thermal fatigue performance compared with foreign products, and the regulation of blank structure before mold opening of hot work die steel is very important to the influence of die performance. Therefore, the preparation of hot work die steel that can meet the band structure and carbide segregation requirements of annealed die steel in the North American Association standard (NADCA#207-2016) is expected to narrow the gap between domestic hot work die steel and foreign products. [0003] The alloying elements in hot work die steel mainly include chromium, molybdenum, and vanadium. They...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/24C22C38/32B21J5/00C21C7/00C21C7/072C22C33/06
CPCC22C38/02C22C38/04C22C38/22C22C38/24C22C38/32C22C38/005C22C38/002C22C33/06C21C7/072C21C7/0006C21C7/0056B21J5/002C21D8/005
Inventor 汪志刚齐亮王和斌叶洁云蔡伟豪刘绪伟
Owner JIANGXI UNIV OF SCI & TECH
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