Transactions of Materials and Heat Treatment

Title：Influence of quasi-β forging process on microstructure and properties of TC21 titanium alloy large forgings

Authors： Zhou Xiaohu Liu Wei Hao Fang Mao Youchuan Lai Yunjin Zhao Zhanglong

Unit： Xi′an Triangle Defense Incorporated Company Western Superconducting Technologies Co. Ltd. Northwestern Polytechnical University Sino-Euro Materials Technologies of Xi′an Co. Ltd.

KeyWords： TC21 titanium alloy quasi-β forging large forgings mechanical properties microstructure

ClassificationCode：TG113.25

year,vol(issue):pagenumber：2020,45(6):29-34

Abstract：

For the TC21 titanium alloy oversized bar and the large forgings manufactured by it, TC21 titanium alloy was forged by the quasi-β forging process, and the influence laws of three different forging plans on the microstructure and mechanical properties of forgings were analyzed. The results show that the TC21 titanium alloy obtains better metallurgical structure and mechanical properties by quasi-β forging process at a certain temperature above the phase transformation point and under different heating process parameters as well as heat treatment by double annealing. Furthermore, TC21 titanium alloy obtains better tensile performance (about 1100 MPa) and fracture toughness (greater than 90 MPa·m1/2) under different forging temperatures and forging fire times in the quasi-β forging process. In the process of quasi-β forging, the higher forging temperature is conducive to obtain the basket structure, the fracture toughness of alloy is higher, and the lamellar α phase of structure has a tendency to coarsen. However, the lower quasi-β forging temperature is conducive to the refinement of microstructure, but there is a small amount of residual equiaxed α phase in the structure after forging. Under the same amount of forging deformation, the finer microstructure is obtained by less forging fire times, but the microstructure morphologies at different positions of the forgings are different.

Funds：

陕西省重点研发计划(2018ZDXM-GY-132)

作者简介：周晓虎（1975-），男，硕士，高级工程师 E-mail：zzhouxiaohu@126.com 通讯作者：赖运金（1979-），男，博士，教授级高级工程师 E-mail：30149395@qq.com

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