β锻造工艺对TC17钛合金显微组织的影响  

Effect of β Forging Process on Microstructure of TC17 Titanium Alloy

作　　者：赵兴东 魏鑫 曾卫东[2] 贺胜通 徐建伟[2] Zhao Xingdong;Wei Xin;Zeng Weidong;He Shengtong;Xu Jianwei(AECC Shenyang Liming Aero-engine Co.,Ltd.,Shenyang 110043,China;State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an 710072,China)

机构地区：[1]中国航发沈阳黎明航空发动机有限责任公司,辽宁沈阳110043 [2]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《钛工业进展》2019年第5期13-17,共5页Titanium Industry Progress

基　　金：国家重点研发计划资助项目(2016YFB0301203)

摘　　要：通过对Φ100 mm×150 mm TC17钛合金棒材进行镦粗试验,研究了β锻造工艺对其微观组织形貌的影响。结果表明:变形量和变形速率对TC17钛合金显微组织有显著的影响。当变形速率为0.1 mm/s时,晶界α相容易被破碎,变形量越大,破碎越严重,且越容易球化,80%变形量时α相的球化率达到80%。当变形速率为2 mm/s时,β晶粒容易发生动态再结晶,变形量越大,再结晶体积分数越高,80%变形量时β相的再结晶体积分数为50%。晶界α相发生球化对变形量和变形速率均较为苛刻,仅在变形量为80%、变形速率为0.1 mm/s时大量晶界α相发生了球化。此外,相比变形量,β再结晶数量对变形速率更加敏感。The effect of β forging process on microstructure was studied by compressing test for Φ100 mm×150 mm TC17 titanium alloy bar.The results show that the height reduction and the deformation rate have a significant effect on the microstructure of TC17 titanium alloy.When the deformation rate is 0.1 mm/s,the grain boundary α phase is easily broken.And the larger the deformation is,the easier grain boundary α phases are to be globularized,which has been severely broken.The percent of globularized α phases is 80% at the height reduction of 80% and deformation rate of 0.1 mm/s.When the deformation rate is 2 mm/s,the β grains are prone to dynamic recrystallization.And the larger the deformation is,the higher the recrystallization volume fraction is.The recrystallization volume fraction of β grain is 50% at the height reduction of 80% and deformation rate of 2 mm/s.The grain boundary a phase can be globularized only in some strict conditions.The a phases are globularized only at the height reduction of 80% and deformation rate of 0.1 mm/s in this study.In addition,the amount of β grain recrystallization is more sensitive to the deformation rate than the height reduction.

关 键 词：TC17钛合金 Β锻造 变形量 变形速率 再结晶 

分 类 号：TG319[金属学及工艺—金属压力加工] TG146.23[一般工业技术—材料科学与工程]