摘要
采用扫描电镜、显微硬度和抗拉强度等测试方法,研究了5052铝合金激光焊接接头组织和性能。研究结果表明,铝合金激光焊接接头热影响区主要为树枝晶,晶粒较为粗大;焊缝区主要为等轴晶,晶粒较母材和热影响区细小。铝合金激光焊接接头显微硬度焊缝区最高,热影响区最低。随着激光功率的增加,铝合金激光焊接接头抗拉强度先增加后降低,激光功率3.0 k W时达到最大值204.5 MPa,拉伸断口为典型的韧窝断口形貌。
The microstructure and properties of aluminium alloy laser welded joints were studied by means of scanning electron microscope, microhardness and tensile tests. The results show that the heat affected zone of the laser welded joint is mainly dendrite, and the grain is coarse. The weld zone is mainly equal axial grain, and the grain size is smaller than that of the base metal and heat affected zone. The microhardness of weld zone in aluminium alloy laser welded joint is the highest, and the microhardness of heat affected zone is the lowest. With the increase of laser power, the tensile strength of aluminium alloy laser welded joint increases firstly and then decreases, and the maximum value of 204.5 MPa is achieved at laser power of 3 kW. The tensile fracture is a typical ductile dimple fracture morphology.
出处
《热加工工艺》
CSCD
北大核心
2017年第1期236-237,242,共3页
Hot Working Technology
基金
山东省自然科学基金项目(ZR2014EL011)
关键词
铝合金
激光焊接
显微组织
抗拉强度
aluminium alloy
laser welding
microstructure
tensile strength
