Transactions of Materials and Heat Treatment

Title：Formation and control measures on microstructure defect of “center bright line” for TA15 titanium alloy large forgings

Authors： Wang Deyong Mo Anjun Yang Lixin Min Wu Wei Minggang Yu Shengfeng Li Wenqiang Xie Jing

Unit： Shenyang Aircraft Industry （Group）Co. Ltd. China National Erzhong Group Deyang Wanhang Die Forging Co. Ltd.

KeyWords： TA15 titanium alloy large forgings center bright line microstructure mechanical property

ClassificationCode：TG316.2

year,vol(issue):pagenumber：2022,47(2):25-29

Abstract：

The evolution law of microstructure and properties for TA15 titanium alloy large forgings during thermal deformation process was studied by process test. The results show that when TA15 titanium alloy undergoes thermal deformation at 950,965 and 980 ℃, excessive thermal deformation occurs, and the significant recrystallization refinement in the center of forgings is found to form a “double set” structure. Furthermore, the new α-phase structure is about 3-5 μm, which is significantly different from the primary α-phase structure (about 10 μm ), resulting in microstructure defects of “center bright line” in the macrostructure of forgings, and the mechanical properties such as strength and plasticity in the microstructure defects region are lower than those in the normal region. Meanwhile, it is found that with the increasing of temperature, the deformation amount decreases to less than 80%, and the generation of microstructure defects is inhibited and the performance of forgings is improved. So by exploring the formation reason of “center bright line” microstruture defects, the process conditions of suppressing microstructure defects are obtained, which provides a basis for the forming of high performance large titanium alloy integral forgings.

Funds：

国家工信部2018年绿色制造系统集成项目

作者简介：王德勇（1987-），男，学士，工程师，E-mail：547462166@163.com；通信作者：莫安军（1982-），男，博士，高级工程师，E-mail：moanjun@163.com

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