Transactions of Materials and Heat Treatment

Title：Changes in microstructure and mechanical properties of TP2 copper tube during multipass bull block drawing process

Authors： Ma Chunxiao1 Liu Jinsong1 2 Chen Yan2 Wang Songwei2 Zhang Shihong2 Fu Tieyan3 Zhang Yongjing3

Unit： 1.School of Material Science and Engineering Shenyang Ligong University 2.Institute of Metal Research Chinese Academy of Sciences 3.Shanghai Longyang Precision Compound Copper Tube Co. Ltd.

KeyWords： TP2 copper tube bull block drawing microstructure tensile strength hardness

ClassificationCode：TG356.5

year,vol(issue):pagenumber：2018,43(12):62-66

Abstract：

The microstructure and mechanical properties of a multipass bull block drawing process for Φ30 mm×1.4 mm TP2 copper tube of a company were analyzed, and the metallographic microstructure of each pass was given during the bull block process. Then, the strainstress curve of each pass was plotted, and the change rule of tensile strength and hardness during processing were given. The results show that the grain sizes are different in different crosssection regions at pass0, and after pass1 the average grain size of different regions tends to be the same（the processing rate is 30.22％）. With the increasing of the number of passes ,the average grain size gradually decreases in the same crosssection region of different passes from 21 μm（at pass0）to 6 μm（at pass5）, meanwhile the crosssection gradually appears striplike grains and the longitudinalsection gradually forms elongated fibrous tissue. Compared with the last pass, the tensile strength and hardness values show a increasing trend, and the tensile strengths increase by 8.3％ and 10.6％at pass1 and pass5 respectively. The hardness values increase by 9.6% and 9.8％at pass1 and pass4 respectively, while other passes have very little fluctuations.

Funds：

基金项目:国家自然科学基金青年基金资助项目(51605307)

作者简介：马春晓（1992-），女，硕士研究生 Email：2291193567@qq.com 通讯作者：刘劲松（1971-），男，博士，副教授 Email：jsliu@imr.ac.cn

Reference：

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