Study on the carbide refining technology of semi high speed steel for cold roller

Lin Faju; Li Xiong; Wu Chengchuan

doi:10.7513/j.issn.1004-7638.2021.03.025

Volume 42 Issue 3

Jun. 2021

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Lin Faju, Li Xiong, Wu Chengchuan. Study on the carbide refining technology of semi high speed steel for cold roller[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(3): 162-171. doi: 10.7513/j.issn.1004-7638.2021.03.025

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Lin Faju, Li Xiong, Wu Chengchuan. Study on the carbide refining technology of semi high speed steel for cold roller[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(3): 162-171. doi: 10.7513/j.issn.1004-7638.2021.03.025

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Study on the carbide refining technology of semi high speed steel for cold roller

doi: 10.7513/j.issn.1004-7638.2021.03.025

Lin Faju^{1, 2
,},
Li Xiong^{1, 2},
Wu Chengchuan^{1, 2}

1.
Special Steel Research Department, Chengdu Advanced Metal Materials Industrial Technology Institute Co., Ltd., Chengdu 610303, Sichuan, China
2.
State Key Laboratory of Marine Equipment Made of Metal Material and Application, Anshan 114009, Liaoning, China

Received Date: 2021-04-09
Publish Date: 2021-06-10

Abstract

Abstract

Based on the results of thermos-Calc calculation and in-situ observation, the carbide refinement technology of 95Cr5mMoV cold roll semi high speed steel was studied. The equilibrium solidification carbides of 95Cr5MoV semi high speed steel mainly include MC, M₇C₃ and M₂₃C₆. Among them, M₂₃C₆ carbides completely dissolve into the matrix at about 785 ℃, M₇C₃ carbides completely dissolve into the matrix at 1100 ℃ and MC carbides completely dissolve into the matrix at about 1170 ℃. It is observed by high temperature confocal microscope that the massive MC carbides begins to dissolve at 960 ℃, and when the temperature rises to 1170 ℃, the dissolution accelerates, but it still exists until 1217 ℃, which indicates that the dissolution temperature of non-equilibrium state is higher than that of equilibrium state. In order to refine carbides, the heat treatment process of “1100 ℃ high temperature solid solution + 880 ℃ three times circulation + 740 ℃ annealing” was adopted in the laboratory. The size of large liquidus carbides decreased obviously, and the microstructure is uniform. The reliability of the process was verified in industrial production.
- cold roller,
- semi high speed steel,
- carbide,
- in situ observation,
- superfine treatment

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References(19)

References

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