TC4钛合金激光焊接接头组织与性能

Microstructure and Mechanical Properties of Ti-6AL-4V Joints by Laser Beam Welding

摘要:

分析不同激光焊接工艺参数下焊缝的微观组织特征，并测试焊缝的力学性能。结果表明：TC4钛合金激光焊接焊缝为针状马氏体α′组成的网篮组织和少量α″相；随着焊接热输入量的增加，由于熔池搅拌、焊接应力、合金元素烧损等原因，马氏体的分布更加散乱和密集；焊接工艺参数对焊缝相组成和各相相对含量的影响均不显著。合理的焊接工艺参数下，接头的强度高于母材

Abstract:

The microstructure of Ti-6Al-4V joints by laser beam welding with different welding parameters was studied, and the tensile properties were investigated. The microstructure of welding seam by laser beam welding consists mainly of α′ martensite phase as well as some α″ phase. By increasing the weld heat input，the distribution of martensite becomes more dispersive and glomerate due to the molten pool stiring, the welding stress and the burning loss of alloy elements. However, the welding parameters have no obviously effects on both the phase composition and the phase ratio. The tensile strength of joints is higher than basal metal when welded with reasonable parameters