Transactions of Materials and Heat Treatment

Title：Failure analysis of extrusion die and optimization of heat treatment process for aluminum alloy circular tube

Authors： Xu Yongli Huang Shuangjian Pang Zugao Wang Yuwen Wei Shibao

Unit： Guangxi College of Water Resources and Electric Power Guangxi University Guangxi YulinKunda Machinery Manufacturing Co. Ltd.

KeyWords： die failure orthogonal experiment heat treatment process mechanical properties

ClassificationCode：TG162.4

year,vol(issue):pagenumber：2015,40(2):116-122

Abstract：

By wreckage analysis method, a study on the failure punch of H13 steel circular tube aluminum alloy after extrusion was carried out. It is found that improper heat treatment condition causes the shunt bridge cracking. And the parameters of heat treatment process were optimized by orthogonal experiment. The results show that after optimizing the heat treatment process, annealed microstructure is spheroidal pearlite of granular cementite dispersing on ferrite, quenched microstructure is needle-type martensite+ residual austenite + remaining carbides, and tempered microstructure is tempered troostite with uniform distribution of fine carbide particles + tempered martensite + residual cementite. The mechanical properties of materials, such as tensile strength, yield strength, impact toughness, elongation, reduction rate of cross section and hardness of the material, are 1549 MPa,1420 MPa, 34.7 J·cm-2 ,15.2%,36.7%, and 49.6 HRC respectively. A good metallographic structure and mechanical properties are obtained to avoid brittle cracking in the die.

Funds：

广西自然科学基金资助项目（2013GXNSFAA019303)；广西有色金属及特色材料加工重点实验室开放课题基金项目（GXKFJ12-04）

徐永礼(1956-)，男，学士，副教授黄双健（1991-），男，硕士研究生

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