热轧温度对TC20合金坯料冷轧成形性的影响-中国材料进展

文章信息/Info

Title:: Effect of Hot Rolling Temperature on Cold Roll Formability of TC20 Alloy

作者:: 罗锦华1; 朱燕丽1; 2; 侯峰起1; 张铁邦2; 田成1; 李英浩1; （1.西部超导材料科技股份有限公司，陕西西安 710018）（2.西北工业大学材料学院，陕西西安 710072）

Author(s):: LUO Jinhua1; ZHU Yanli1; 2; HOU Fengqi1; ZHANG Tiebang2; TIAN Cheng1; LI Yinghao1; (1. Western Superconducting Technologies Co, Ltd, Xian 710018, China)(2. School of Materials Science and Engineering, Northwestern Polytechnical University, Xian 710072, China)

Keywords:: TC20 titanium alloy; hot rolling temperature; cold roll formability; microstructure; room temperature compression

摘要:: 研究了在1000，940，850 ℃不同温度热轧的TC20合金坯料在冷连轧过程中的变形与失稳情况，结合热轧棒材组织和室温压缩的实验结果，表明：热轧温度越低，冷轧成形性越差。850 ℃热轧的TC20合金棒坯纵向组织中α相呈连续纤维状，冷连轧成形性比较差，极限变形量仅40%左右；1000 ℃的热轧坯料组织中β相占比增加，冷连轧变形量可以达到60%，同时，其室温压缩实验过程中断裂压缩率高，塑性变形阶段加工硬化速率较小。通过室温压缩实验可直观评价TC20合金丝材的冷轧成形性能。

Abstract:: In this paper, the deformation and destabilization of cold rolling TC20 alloy bars which were hotrolled at 1000, 940 and 850 ℃, were analyzed and compared. Combined with the microstructure of hotrolled bars and room temperature compression experiments, the result showed that the lower hotrolling temperature, the poorer the coldrolling formability. The bar hotrolled at 850 ℃ possessed the longitudinal microstructure of continuous fibrous αphase, and cold deformation property was poor, about 40%. The bar hotrolled at 1000 ℃ possessed more βphase, the cold deformation reached up to 60%, and showed higher compression rate and lower workhardening rate. The coldrolling formability of TC20 alloy bar had a strong correlation with its room temperature compression performance, the bars with higher compression rate and lower hardening rate in the plastic deformation stage had better cold roll formability.