Transactions of Materials and Heat Treatment

Title：Study on properties of heat deformation and heat treatment for Ti alloy TC8M-1

Authors： Li Yafei Fang Bo Wang Guan Ma Wen'ge Zhang Pinghui

Unit： Guizhou Aero-Engineer Institute of AVIC Shenyang Liming Aero-Engineer Company West Super-Conduction Technology Company Limited Baoji Titanium Alloy Group

KeyWords： Ti alloy TC8M-1 forging heat treatment microstructure

ClassificationCode：TG166.5；TG319

year,vol(issue):pagenumber：2015,40(2):127-132

Abstract：

Ti alloy TC8M-1 under the deformation rates of 5%，15%，30%，50% and 70% at 910 ℃ was forged respectively for testing its properties of heat deformation and heat treatment. Microstructure was observed and compared with the ones which were observed under the deformation rate of 40% at 890℃ and 930 ℃ respectively. Finally heat treatment experiments were carried out. The results show that TC8M-1 alloy is of good plastic deformation properties and wide forging temperature range. When the forging temperature is at 910 ℃, the deformation rate shoots up to 70% at once heat treatment. However, fine microstructure areas are found when the deformation rate exceeds 50%. Under the condition of deformation rate 40%，primary α phase is spheroidized at 930 ℃, and primary α phase is kept plastic deformation at 890 ℃. Thus, suitable heat treatment condition of Ti alloy TC8M-1 is under cooling for two hours at 930 ℃ or cooling for an hour at 590 ℃ to meet the tensile strength at room temperature and enduring strength at 450 ℃.

Funds：

江苏省自然科学基金资助项目（BK2005128）

李亚非（1986-），男，硕士，工程师

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