在超低温下使用的TC4 ELI钛合金锻棒的研制  

Development of TC4 ELI Titanium Alloy Rod under Ultra Low Temperature

作　　者：陈国财[1] 单学锋 陈苏[1] 晁雷[1] 杨文甲 冯新 闫东辉 

机构地区：[1]沈阳市亨运达钛业开发有限公司,辽宁沈阳110102 [2]沈阳市和世泰通用钛业有限公司,辽宁沈阳110102

出　　处：《钛工业进展》2012年第5期27-29,共3页Titanium Industry Progress

摘　　要：在低温下,TC4 ELI钛合金只能在-196℃下使用。根据某工程的实际需要,开发超低温(-253℃)用TC4ELI钛合金锻棒。从控制氧含量和提高合金纯洁度入手,并在锻造工艺上采用最新"三三一"镦拔组合变形工艺来提升锻棒的组织均匀性,来提高强度和塑性。实验结果表明:高纯洁度是提高TC4 ELI钛合金在-253℃下塑性的基础;"三三一"镦拔变形工艺制得100 mm棒材的超低温力学性能较好,其Rm为1 480～1 510 MPa,Rp0.2为1 240～1 290MPa,A为12.67%～18.67%,Z为27.8%～33.3%,满足工程技术性能指标要求(J901-01-2009)。Under ultra low temperature, TC4 ELI titanium alloy be competent for the work only under - 196 ℃. Ac- cording to the requirement of a project, development of TC4 ELI titanium alloy rod under ultra low temperature（ -253 ℃ ）was carried out. In order to increase the strength and ductility, several important technological parameters were optimized including oxygen content control, alloy purity improvement and the latest ＂331＂ upsetting and stretching forging process application. The results show that the high purity is the key parameter to increase the ductility of TC4 ELI titanium alloy at -253 ℃. The mechanical properties of Ф100 mm rod from ＂331＂ upsetting and stretching forg- ing process are： 1480-1510 MPa forR 1 240-1 290 MPa for Rp0.2, 12.67% -18.67 %forA and 27.8% 33.3% for Z. The mechanical properties have satisfied the demand of J901 -01 -2009.

关 键 词：TC4 ELI钛合金 -253℃ 镦拔变形 力学性能 

分 类 号：TG166.5[金属学及工艺—热处理]