Carbide evolution law of high chromium and high vanadium powder metallurgy tool steel M390 during austenitizing

doi:10.13251/j.issn.0254-6051.2023.11.001

Abstract

Abstract: Evolution of carbides in the M390 steel during different austenitizing processes was studied using analysis methods such as SEM-EDS, TEM, and Image-Pro Plus. The results show that under the austenitizing conditions of heating at 1075-1150 ℃ and holding for 15-120 min, the volume fraction and average size of carbides in the M390 steel show a decreasing trend as the quenching temperature increases. At the same quenching temperature, with the prolongation of holding time, the amount of carbides decreases as a whole, the average size of carbides decreases first and then increases, while the amount of small carbides and hardness increase first and then decrease. The types of undissolved carbides in high temperature oil quenched steel are mainly M₇C₃ and M₈C₇. During austenitizing, the change of carbides in the M390 steel is mainly the dissolution, growth and dissolution of M₇C₃.

Key words: stainless tool steel M390, austenitizing, carbides

CLC Number:

TG156

Deng Jinqiang, Zhang Qinyi, Chen Jun, Wu Dong, Liu Wei, Zhou Hongfeng. Carbide evolution law of high chromium and high vanadium powder metallurgy tool steel M390 during austenitizing[J]. Heat Treatment of Metals, 2023, 48(11): 1-7.

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