Transactions of Materials and Heat Treatment

Title：Study on temper brittleness for 30CrMnSiA steel of type II

Authors： Huang Youhua1 Ai Yongping2

Unit： (1.College of Mechanical Engineering Jiangxi Vocational and Technical College of Mechanical and Electrical Engineering Nanchang 330006 China 2.College of Mechanical and Electrical Engineering Jinggangshan University Ji′an 343009 China)

KeyWords： alloy structural steel tempering brittleness cooling rate impact toughness mechanical properties

ClassificationCode：TB31

year,vol(issue):pagenumber：2024,49(12):162-165

Abstract：

Abstract: In order to solve the problem of 30CrMnSiA steel of type II being prone to temper brittleness, which leads to a decrease in impact toughness and subsequently caused fatigue fracture accidents, the quenching and tempering treatments of 30CrMnSiA steel of type II were carried out at different temperatures and cooling media, and the mechanical properties and microstructure of 30CrMnSiA steel of type II after tempering were analyzed. Then, the relationship between tempering brittleness and tempering cooling rate of 30CrMnSiA steel of type II was studied. The results show that carbides in the matrix of 30CrMnSiA steel of type II are disperseclly distributed at grain boundaries and within grains, and the hardness after tempering at 650 ℃ is significantly reduced compared to that after tempering at 510 ℃.Tempering at 510 ℃ belongs to the brittle section of

30CrMnSiA steel of type II. The brittleness generated after tempering is independent of the cooling rate of tempering. At this temperature, whether it is fast cooling or slow cooling, tempering brittleness occurs, and tempering at this temperature should be avoided as much as possible. At the same temperature of tempering, the hardness of rapid cooling is higher than that of slow cooling, but the difference in impact performance is not significant, and the impact performance is mainly affected by the tempering temperature.

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作者简介：黄有华（1973-），男，学士，副教授 E-mail：284932031@qq.com 通信作者：艾永平（1977-），男，博士，教授 E-mail：27440767@qq.com

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