薄壁H65黄铜管高频感应焊接接头组织和力学性能  

Microstructure and Mechanical Properties of Thin-walled H65 Brass Pipe Welded Joint by High Frequency Induction

作　　者：蔡琰 周雷 叶枫 张炎雨 谢志雄[1,2] 董仕节 谈芬芳[3] 解剑英 CAI Yan;ZHOU Lei;YE Feng;ZHANG Yanyu;XIE Zhixiong;DONG Shijie;TAN Fenfang;XIE Jianying(Hubei Key Laboratory of Green Light Industrial Materials,Hubei University of Technology,Wuhan 430068,China;Hubei Longzhong Laboratory,Xiangyang 441000,Hubei,China;School of Mechanical Engineering,Wuhan Polytechnic University,Wuhan 430023,China;Wuhan Botal New Materials Technology Co.,Ltd.,Wuhan 430058,China)

机构地区：[1]湖北工业大学绿色轻工材料湖北省重点实验室,武汉430068 [2]湖北隆中实验室,湖北襄阳441000 [3]武汉轻工大学机械工程学院,武汉430023 [4]武汉市博钛新材料科技有限公司,武汉430058

出　　处：《材料导报》2024年第14期182-187,共6页Materials Reports

基　　金：国家自然科学基金(51771071);湖北省国际科技合作项目(2022EHB020);湖北隆中实验室自主创新项目(2022ZZ-17)。

摘　　要：对薄壁H65黄铜高频感应焊接后的焊接接头微观组织和力学性能进行了研究。结果表明,利用高频感应焊接技术焊接H65黄铜管,获得了表面成型良好的焊接接头,实现了高质量焊接。焊接接头熔合区和热影响区均呈上下宽,中间窄的腰鼓状,焊接接头宽度约为173μm,其中熔合区宽约15μm,由大量细小的等轴状晶粒和少量条状晶粒组成,熔合区和热影响区的晶粒较母材得到细化。焊接接头抗拉强度为400 MPa,达到母材抗拉强度的97.6%,这是由于在拉伸变形过程中,晶粒的细化阻碍位错变形,且各晶粒间的位向差使位错相互交割,提高了焊接接头的强度,焊接接头断裂发生在热影响区,为韧性断裂,这是焊接过程中挤压辊的加工硬化与焊后退火软化共同作用影响热影响区力学性能所致。焊接接头显微硬度呈现“ʌ”形分布,熔合区平均硬度值为145HV,热影响区137HV,母材129HV,熔合区硬度较母材提高了16%,焊接时产生的加工硬化使熔合区强度得到提升。The microstructures and mechanical properties of high-frequency induction welded joints of thin-walled H65 brass pipe were studied.The results show that high frequency induction welding technology used to weld H65 brass pipe can obtain well-formed welds on the surface and achieve high-quality welding.The fusion zone and heat affected zone of the welded joint are shaped like a waist drum,which with a narrow waist.The width of the welded joint and the fusion zone is about 173μm and 15μm,respectively.The microstructure of the fusion zone is composed of numerous small equiaxed grains and a small amount of strip grains.The grains in the fusion zone and heat affected zone are refined compared with the base metal.The tensile strength of the welded joint is 400 MPa,which is 97.6%of the tensile strength of the base metal.The increase of the strength of the welded joint is due to the dislocation deformation hindered by the refinement of grains and the interaction of dislocations promoted by the phase orientation difference between grains in the process of tensile deformation.The fracture of welded joint occurs in the heat affected zone due to the offset between work hardening during welding and anneal softening after welding,and the fracture mode of welded joint is mainly ductile fracture.The microhardness of the welded joint shows a‘ʌ’shape distribution.The average hardness values of the fusion zone,the heat affected zone and the base metal is 145HV,137HV and 129HV,respectively.The hardness of the fusion zone is increased by 16%compared with that of the base metal.The increase of the strength of the fusion zone is caused by the work hardening generated during welding.

关 键 词：H65黄铜 高频焊 微观组织 力学性能 

分 类 号：TG456.9[金属学及工艺—焊接]