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采用光学显微镜、拉伸实验机及显微硬度计研究了热处理对BTi-6431S合金激光焊焊接接头组织与性能的影响。结果表明,BTi-6431S合金激光焊原始焊接组织为块状初生α相和片层状β相转变组织组成,经不同温度热处理获得不同形态α相。随着热处理温度的升高,次生α相的体积分数增加;焊接接头室温与高温抗拉强度和屈服强度逐渐升高,伸长率呈现先升高后降低的变化趋势。经650℃热处理后,BTi-6431S合金激光焊接接头室温显微硬度最高。
The effects of heat treatment on the microstructure and properties of BTi-6431S alloy laser welded joints were studied by optical microscope, tensile testing machine and microhardness tester. The results show that the original welded structure of BTi-6431S alloy is a bulk primary α phase and a lamellar β phase transformation structure, and different morphology α phases are obtained by heat treatment at different temperatures. With the increase of the heat treatment temperature, the volume fraction of the secondary α phase increased. The tensile strength and yield strength of the welded joint at room temperature and high temperature gradually increased, and the elongation increased first and then decreased. After heat treatment at 650 ℃, BTi-6431S alloy laser welded joints have the highest microhardness at room temperature.