锻压技术

基于加工图技术的铸态TB6钛合金锻造工艺优化

英文标题：Optimization of high-temperature alloy forging process of TB6 alloy casting by processing map

分类号：V252；TG146.2

出版年,卷(期):页码：2010,35(3):11-15

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.

基金项目：

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）

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