Transactions of Materials and Heat Treatment

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

Authors： YU Xing-qiang LU Shi-qiang LI Xin OUYANG De-lai HUANG Xu LEI Li-ming

Unit： Nanchang Hangkong University Beijing Institute of Aeronautical Materials

KeyWords： casting TB6 alloy Murty criterion deformation mechanism forging process optimization

ClassificationCode：V252；TG146.2

year,vol(issue):pagenumber：2010,35(3):11-15

Abstract：

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.

Funds：

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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