【摘要】 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。更多还原

【Abstract】 The effect of heat treatment processes on microstructure and mechanical properties of laser-welded BTi-6431 S alloy was investigated by means of optical microscope,tensile tester and microhardness tester. The results show that the as-welded microstructure of laser-welded BTi-6431 S alloy is composed of massive primary α phase and lamellar β phase transformation microstructure. The various αphases can be obtained by different heat treatment processes. With the increase of heat treatment temperature,the secondary α-phase increases,meanwhile the tensile and yield strength of the welded joints at room and high temperature increases,while the elongation increases firstly and then decreases. The best microhardness appears when the temperature is 650 ℃.更多还原