热处理对航空用TC4钛合金薄板力学性能影响研究

Study on the Effects of Heat-treatment on Mechanical Properties of TC4 Titanium Alloy Sheets for Aviation Application

研究了TC4钛合金薄板经普通退火、α+β两相区固溶加时效处理及β单相区固溶加普通退火处理后,显微组织与力学性能的关系。结果表明,普通退火处理对TC4钛合金板材显微组织的影响较小,α+β两相区固溶加时效处理后能够获得双态组织,而β单相区固溶加普通退火处理能获得粗大的魏氏组织;其中双态组织的TC4钛合金薄板表现出优异的拉伸性能,而魏氏组织的TC4钛合金薄板具有较低的疲劳裂纹扩展速率及较高的裂纹扩展阻力。

This paper investigated the microstructure and mechanical properties of TC4 titanium sheets under annealing, α＋β solution and aging treatment and β solution and annealing treatment. The results show that annealing treatment has little effect on microscopic morphology of TC4 titanium sheets. TC4 titanium sheet with bimodal structure is obtained by α＋βsolution and aging treatment, and Widmanstattten structure with rough grains could be obtained by β phase solution and annealing treatment. In terms of mechanics performance, TC4 titanium sheet with binary structure shows excellent tensile properties, while Widmanstatten structure exhibits the highest ability to resist crack propagating.