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Title:: Effect of Heat Treatment on Microstructure and Mechanical Properties of High Strength Titanium Alloy

Author(s):: WANG Fuqiang1; ZHANG Ruixue2; YANG Lixin1; WANG Xiaowei1; MA Yingjie3; Huang Sensen3; LEI Jiafeng3; 1. Shenyang Aircraft Industry (Group) Co. , Ltd. , Shenyang 110850, China 2. School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China 3. Shi-Changxu Innovation Center for Advanced Materials, Institute of Metal Research,Chinese Academy of Sciences, Shenyang 110016, China

Keywords:: high strength titanium alloy; heat treatment; grain size; grain boundary coarsening; mechanical properties

Abstract:: The near β high-strength titanium alloy is widely used in the aerospace field. Microstructure control is being focused on to achieve a good match between strength and toughness of high-strength titanium alloys. The size of β grains and the morphology of grain boundaries of a novel near β titanium with different heat treatments were characterized in this paper.The grain size was affected by the solution time, and the behavior of grain boundary coarsening was affected by (α+β) phase region solution. The effect of grain size and the morphology of grain boundary on mechanical properties were studied. The results show that the β grains grow up gradually with the extension of solution time in β phase region, and the size of β grains has no significant effect on tensile property and impact toughness. In the process of two-stage solution, the primary α phase precipitates preferentially along the grain boundary, which coarsen the grain boundary. The lower temperature in the (α+β) phase region solution, the more obvious the grain boundary coarsening. The grain boundary coarsening reduces the strength and plasticity of at the same time, but has no significant effect on the impact toughness.