Transactions of Materials and Heat Treatment

Title：Influence of heat treatment process on the properties of new-typed hot-extruded die containing magnesium

Authors： Zhao Ping Guan Yunqing Zhao Guoji

Unit： Chongqing Industry Polytechnic College Chongqing University

KeyWords： hot extrusion die isothermal annealing quenching wear resistance thermal fatigue

ClassificationCode：TG249.2

year,vol(issue):pagenumber：2016,41(10):138-141

Abstract：

In order to study the influences of heat treatment process on the wear resistance and thermal fatigue resistance of the new-typed hot-extruded die containing magnesium 4Cr5MoSiV1Mg1, the new-typed hot-extruded dies were heated under six different processes, and the surface hardness test, high temperature wear test at the temperature of 500 ℃ and thermal fatigue test of the dies after heat treatment were conducted and analyzed. The results show that they first increase and then decrease with increase of annealing temperature from 820 ℃ to 920 ℃ or quenching temperature from 1000 ℃ to 1080 ℃. Comparing with normal annealing 870 ℃×8 h, the isothermal annealing 870 ℃×2 h+700 ℃×6 h increases the surface hardness by 14%, decreases wear volume by 45% at 500 ℃, reduces the mesh crackle and main crackle grade from grade 2 to grade 1 respectively, and reduces the grade of thermal fatigue crackle from grade 4 to grade 2. Thus, the optimized annealing process is the isothermal annealing process at 870 ℃×2 h+700 ℃×6 h, and the optimized quenching temperature is 1040 ℃.

Funds：

重庆市教委科研项目（KJ132105）；2010年重庆市高等教育教学改革重大项目（101403）

作者简介：赵平（1962-），男，学士，副教授,高级工程师 E-mail：zhp827@qq.com

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