摘要
采用金相显微镜(OM)、扫描电镜(SEM)、微机控制电子万能试验机对ZL101A焊丝MIG焊焊接6061-T6铝合金焊接接头固溶+时效处理前后的显微组织、力学性能进行研究。结果表明,焊接接头经固溶+时效处理后,只有3个区,基体区、熔合区以及焊缝区,无明显的热影响区。基体组织中Mg2Si强化相、未熔Si相有所减少;焊缝区晶界及晶粒内部时效析出的Mg2Si强化相增多,且弥散分布。焊接接头在较高的抗拉强度和伸长率下断裂处在焊缝区,抗拉强度达到293.3MPa,是母材的94.6%,伸长率为6.8%,是母材的56.7%。未经处理的焊接接头断裂处在热影响区。处理前后的焊接接头断裂形式均为典型的韧性断裂。
Microstructure and properties of 6061-T6 aluminum alloy joint welded with ZL101 A welding wire by MIG after and before solid solution and aging treatment were investigated by optical microscope（OM）,scanning electron microscope（SEM）and computer-controlled electronic universal testing machine.The results show that there exist only three zones including matrix,fusion and welded zone.Mg2 Si strengthening phases and incomplete fusion phases are decreased in the matrix,however,Mg2 Si strengthening phases with increase and uniform distribution can be precipitated at the grain boundary and grain interior in the welded zone during aging treatment.The welding joints have the higher tensile strength and elongation in the weld zone,reaching 293.3 MPa and 6.8%,which are 94.6% and 56.7%of the base metal,respectively,so it is cracked at the welded zone.On the contrary,the untreated welding joints are cracked at the heat affected zone.Welded joints before and after treatment are characterized by typical ductile fracture.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2017年第1期18-21,共4页
Special Casting & Nonferrous Alloys
关键词
焊接接头
显微组织
抗拉强度
伸长率
Welding Joint
Microstructure
Tensile Strength
Elongation
