Heat Treatment of Metals ›› 2022, Vol. 47 ›› Issue (11): 82-86.DOI: 10.13251/j.issn.0254-6051.2022.11.013

• PROCESS RESEARCH • Previous Articles     Next Articles

Effect of annealing temperature on microstructure and properties of low cost TC4LCA titanium alloy plate

Wang Jian2, Feng Qiuyuan1,2, Lei Ting2, Zhang Yongqiang1,2, Wang Xiaoxiang1,2   

  1. 1. Baoti Group Ltd., Baoji Shaanxi 721014, China;
    2. Baoji Titanium Industry Co., Ltd., Baoji Shaanxi 721014, China
  • Received:2022-08-30 Revised:2022-09-28 Online:2022-11-25 Published:2023-01-04

Abstract: In order to improve the strength and impact properties of the low cost TC4LCA titanium alloy plate, different annealing temperatures were selected for heat treatment of the plate with typical dimensions. After annealing, the change law of the microstructure and properties of the alloy was investigated, and the effect of microstructure on strength and impact properties was analyzed. The results show that the long strip primary α phase transforms to be equiaxed with the increase of annealing temperature, meanwhile, the acicular or flake secondary α phase is precipitated from the β transformation microstructure. With the increase of annealing temperature, the long strip primary α phase decreases in amount and tends to be equiaxed obviously until to its coarsening, and the acicular or flake secondary α phase grows up. When the annealing temperature increases, the strength of the alloy first increases and then decreases, the elongation after fracture decreases slightly, while the impact absorbed energy increases. For comprehensive consideration, the strengths, plasticity and toughness of the TC4LCA titanium alloy plates can get optimum match when the annealing temperature is in the range of 800-880 ℃.

Key words: TC4LCA titanium alloy, microstructure, strength, toughness

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