Effect of Solid Solution and Aging Treatment on the Strength and Toughness of TC21 Titanium Alloy
Author of the article:MI Lei 1,2 , ZHANG Chenhui 1,2 , HE Tianqi 1,2 , HE Rong 1,2 , FAN Jiangkun 3 , XUE Xiangyi 1,2,3
Author's Workplace：1. Xi'an Chao Jing Technology Co., Ltd., Xi'an 710200, China; 2. Shaanxi Key Laboratory of Advanced Metal Structural Materials Precision Thermoforming, Xi'an 710200, China; 3. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi' an 710072, China
Key Words： TC21 titanium alloy; heat treatment; tensile properties; toughness
Abstract：
The effects of aging temperature and time on microstructure, room temperature tensile properties and impact properties of TC21 titanium alloy after rapid cooling in two-phase field solution treatment were investigated and discussed. The results show that the size of primary α phase increases with the increase of aging time, but room temperature tensile strength decreases, and the plasticity has no obvious change. The size of primary α phase and the plasticity increases with the increase of aging temperature, but room temperature tensile strength decreases obviously. TC21 titanium alloy can achieve the best strength and plasticity matching through the heat treatment process of 900 ℃ insulation for 120 min followed by water cooling (WC), and 600 ℃ insulation for 360 min followed by air cooling (AC) under the rapid cooling of two-phase solid solution treatment.
