Development of microstructural inhomogeneity in multi-pass flow forming of TA15 alloy cylindrical parts

作     者：Xianxian WANG Pengfei GAO Mei ZHAN Ke YANG Yunda DONG Yukun LI Xianxian WANG;Pengfei GAO;Mei ZHAN;Ke YANG;Yunda DONG;Yukun LI

作者机构：State Key Laboratory of Solidification ProcessingShaanxi Key Laboratory of High-Performance Precision Forming Technology and EquipmentSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi'an 710072China 

出 版 物：《Chinese Journal of Aeronautics》 (中国航空学报（英文版）)

年 卷 期：2020年第33卷第7期

页      面：2088-2097页

核心收录：

学科分类：08[工学] 082503[工学-航空宇航制造工程] 0802[工学-机械工程] 0825[工学-航空宇航科学与技术] 0801[工学-力学（可授工学、理学学位）] 

基　　金：the financial support from the National Science Fund for Distinguished Young Scholars of China(No.51625505) the Key Program Project of the Joint Fund of Astronomy and National Natural Science Foundation of China(No.U1537203) National Natural Science Foundation of China(No.51875467) the support of Young Elite Scientists Sponsorship Program by CAST of China(No.2018QNRC001) 

主　　题：Deformation history Microstructural inhomogeneity Multi-pass flow forming TA15 alloy cylindrical parts Vickers hardness 

摘      要：Revealing the development of microstructural inhomogeneity in the multi-pass flow forming of titanium alloy components is of great significance to the microstructure control and property *** this end,the microstructural inhomogeneity of TA15 alloy spun cylindrical parts was analyzed based on the deformation *** results indicate that the material underwent significant compressive strain in the normal direction(ND),tension strain in the rolling and circumferential directions(RD and CD),while tension strain in the CD is slightly small due to the limited material flow in this *** strain characteristics make the microstructure,especially the primary a(ap),present different morphologies in the different planes of the ***,the combined effects of inhomogeneous deformation and temperature distribution in the ND also cause the inhomogeneity of microstructure morphology and parameters in this *** analyses show that with the forming pass increasing,the aspect ratio of apincreases most in the normal-rolling plane,then in the normal-circumferential plane and least in the circumferential-rolling plane,whereas apcontent decreases in an opposite *** the ND,the aspect ratio and content of apis relatively high in the outer and inner surface areas but lowest in the central area,and these inhomogeneous characteristics can be gradually diminished with the forming pass ***,the variation of hardness inhomogeneity factor indicates that a four-pass forming with the total reduction ratio of 63%could obtain a homogenous microstructure along the ND of the TA15 alloy spun cylindrical part.