基于加工图技术的铸态TB6钛合金锻造工艺优化  

Optimization of high-temperature alloy forging process of TB6 alloy casting by processing map

作　　者：余兴强[1] 鲁世强[1] 李鑫[1] 欧阳德来[1] 黄旭[2] 雷力明[2] 

机构地区：[1]南昌航空大学材料科学与工程学院,江西南昌330063 [2]北京航空材料研究院,北京100095

出　　处：《锻压技术》2010年第3期11-15,共5页Forging & Stamping Technology

基　　金：国家重点基础研究发展计划资助(2007CB613803);航空科学基金(2009ZE56014);江西省自然科学基金(2008GZC0041);江西省教育厅科技项目(GJJ08203);江西省研究生创新专项资金项目(YC08A085);南昌航空大学研究生科技创新基金资助项目(YC2007001)

摘　　要：在Thermecmaster-Z型热模拟实验机上对铸态TB6钛合金在800－1150℃、0.001－10 s^-1变形参数范围内进行了等温恒应变速率压缩实验,根据实验数据采用基于Murty准则的加工图技术对该合金的锻造工艺进行了优化,并结合显微组织观察研究了该合金的变形机制。结果表明,在低温区的较佳变形参数为800－950℃、0.001－0.01 s^-1,其变形机制为大晶粒超塑性;在高温区的较佳变形参数为1020－1080℃、0.001－0.006 s^-1,其变形机制为动态再结晶。失稳区出现在800－890℃、0.01－10 s^-1的低温区和975－1120℃、3.162－10 s^-1的高温区域,在流变失稳区会出现晶界裂纹。The isothermal and constant strain rate compression tests of TB6 alloy casting were conducted in the range of 800-1150 ℃ and 0.001-10 s^-1 by Thermecmaster-Z simulator.According to the experimental data,the alloy forging process was optimized by means of processing map technology based on Murty criterion,and micro-deformation mechanisms was investigated combined with microstructure observation.The results show that at low deformation temperature,the feasible deformation conditions are 800-950 ℃,0.001-0.01 s^-1 with the deformation mechanism of large grain superplasticity.The feasible deformation conditions at high deformation temperature are 1020-1080 ℃,0.001-0.0056 s^-1 with the deformation mechanism of dynamic recrystallization.The region of flow instability occurs in the area of low deformation temperature with 800-890 ℃,0.01-10 s^-1 and of high deformation temperature with 975-1120 ℃,3.162-10 s^-1.The grain boundary crack appears in the region of flow instability.

关 键 词：铸态TB6钛合金 Murty准则 变形机制 锻造工艺优化 

分 类 号：TG319[金属学及工艺—金属压力加工]