TC4钛合金激光焊对接接头静力拉伸载荷下变形行为特征研究

静载拉伸试验是最基本的、应用最广的材料力学性能试验。本文试图通过对静力拉伸载荷下TC4母材和激光焊缝接头试样红外热像的记录和温度场变化特征的对比分析，来揭示激光焊缝的存在对于试样受力变形行为的影响规律。研究结果表明：宏观抗拉强度、屈服强度以及断裂时间都基本相同的焊缝和母材试样，其红外结果存在相同点，同时也存在明显的差异性。首先，开始出现物理屈服现象的时间以及对应的应力有差异；焊缝和母材试样在物理屈服发生后，其温度分布及演变规律具有很大的差异性，表明了焊缝的存在对试样的塑性变形规律具有较大的影响。

Study on Deformation Behavior of TC4 Titanium Alloy Laser Welded Butt Joint under Static Tensile Loading

Static load tensile test is the most widely used mechanical properties test. In this paper, it is tried to reveal that the influence of the presence of laser welded joint on the deformation behavior of the specimen by comparing the thermal effects of TC4 base metal and joint specimen during tensile test by infrared thermograph method. The results show that for joint and base metal specimens with the same tensile strength, there are many differences in the thermal effect, such as the beginning times of the physical yield phenomenon and the corresponding stresses, the temperature distribution and evolution process.