Transactions of Materials and Heat Treatment

Title：Influence law of retained austenite on physical properties for S136 series steel

Authors： Wu Zhenghuan Huang Lifeng Gu Liwen Li Rongfeng Ruan Feng Sun Kangbin Li Xiaohui Fan Qixiang Wang Quan

Unit： National Center for Quality Supervision and Inspection of Mold Products Tianjin Vocational and Technical Normal University Centre of Excellence for Advance for Advanced Materials South China University of Technology

KeyWords： S136 steel typical heat treatment retained austenite impact toughness dimensional stability

ClassificationCode：TG142.14

year,vol(issue):pagenumber：2021,46(8):217-223

Abstract：

For the S136 steel of Associated Swedish Steel AB (ASSAB) and S136 SUP steel and 2083 ESR steel of Hong Kong Lung Kee Company (LKM), the distribution of retained austenite and the variation of dimensional stability and impact toughness for specimens after typical heat treatment process were compared and analyzed，and the influence laws of retained austenite on the latter two were summarized. The experiment results show that the S136 SUP steel has the highest content of retained austenite，while the S136 steel and 2083 ESR steel have lower contents. At the same time, the content of retained austenite is greatly increased by low temperature tempering at 280 ℃. Furthermore, the impact toughness of die steel after typical heat treatment is directly proportional to the content of retained austenite and inversely proportional to the tempering temperature, and the dimensions of die steel follow the law of first decreasing，then increasing and then stabilizing. In addition，the specimen dimensions of die steel in different periods are calculated and predicted by the mathematical model based on the volume stabilization rate of martensite and the conversion rate of retained austenite.

Funds：

国家教师科研基金十二五规划（CTF120702）；天津市科技特派员项目（20YDTPJC00900，20YDTPJC00100）

吴正环（1986-），男，博士，讲师，硕士研究生导师 E-mail：wzh@gddqt.com 通信作者：谷历文（1968-），男，硕士，教授级高工 E-mail：glw@gddqt.com

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