Transactions of Materials and Heat Treatment

Title：Influence of isothermal forging deformation degree on microstructure and mechanical property of titanium alloy BT25y

Authors： Yuan Shichong Yang Xuemei Guo Hongzhen

Unit： Deyang Wan Hang Die Forging Co. Ltd. China National Erzhong Group Co. Northwestern Polytechnical University

KeyWords： titanium alloy BT25y isothermal forging deformation degree fracture microstructure mechanical property

ClassificationCode：TG319

year,vol(issue):pagenumber：2017,42(1):131-137

Abstract：

In order to confirm the optimum isothermal forging parameters for BT25y titanium alloy, the influences of deformation degree such as 20%，40%，60% on the microstructure and mechanical properties were studied. Results show that with the increase of deformation degree, the original big β grain is gradually squashed, the β grain boundary is broken at a certain degree, the width of intracrystalline lamellar α increases, and the whole microstructure becomes more uniform. At the same time, the tensile strength shows a trend of increase after a first decline, the elongation and reduction of area show a trend of rise, and the fracture toughness basically maintains the upward trend. The room-temperature tensile fracture mode is changed from transgranular cleavage fracture to quasi-cleavage fracture, and finally it is transformed into mainly ductile fracture when the large deformation occurs. Under the above experimental conditions, the corresponding microstructures and properties of forgings can achieve a good match at the deformation degree of 60%.

Funds：

国家自然科学基金资助项目（51205319）

袁士翀（1982-），男，硕士，工程师 E-mail：yuanshichong@126.com 通讯作者：杨雪梅（1989-），女，博士研究生 E-mail：yangxuemei@mail.nwpu.edu.cn

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