超薄壁黄铜散热器扁管高频感应焊接接头的组织和性能  

Microstructure and properties of high frequency induction welded joints of ultra-thin walled brass radiator flat tubes

作　　者：周雷 蔡琰 叶枫 张炎雨 谢志雄[1,2] 董仕节 解剑英[4] ZHOU Lei;CAI Yan;YE Feng;ZHANG Yan-yu;XIE Zhi-xiong;DONG Shi-jie;XIE Jian-ying(Hubei Key Laboratory of Green Light Industrial Materials,Hubei University of Technology,Wuhan 430068,China;Hubei Longzhong Laboratory,Xiangyang 441022,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,湖北武汉430068 [2]湖北隆中实验室,湖北襄阳441022 [3]武汉轻工大学机械工程学院,湖北武汉430023 [4]武汉市博钛新材料科技有限公司,湖北武汉430058

出　　处：《材料热处理学报》2024年第7期212-220,共9页Transactions of Materials and Heat Treatment

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：采用高频感应焊接技术对0.13 mm壁厚的H65黄铜扁管进行焊接,利用光学显微镜、扫描电镜、电子探针、电子背散射衍射、显微硬度仪以及拉伸实验对焊接接头的微观组织和力学性能进行了研究。结果表明:高频感应焊接H65黄铜扁管的焊接接头无裂纹、气孔等缺陷,焊缝区没有出现Zn的大量蒸发。焊接接头的抗拉强度达到400 MPa,达到母材的94%,伸长率为33.89%,与母材接近;焊接接头的显微硬度呈W型分布,熔合区最高,母材区次之,热影响区最小。焊接过程的挤压作用导致焊缝位错密度增加,产生加工硬化,是影响焊接接头硬度分布的主要原因;与母材相比,焊接接头的显微组织得到明显的细化,平均晶粒尺寸为1μm,是母材的50%,小角度晶界增加到了72%,大角度晶界下降到了28%,其中孪晶界下降到2%,进一步提高了焊接接头的力学性能。High frequency induction welding technology was used to weld H65 brass flat tubes with a wall thickness of 0.13 mm.Microstructure and mechanical properties of the welded joint were studied using optical microscope,scanning electron microscopy,electron probe,electron backscatter diffraction technique,microhardness tester and tensile tests.The results show that the welding joint of the H65 brass flat tube by high-frequency induction welding has no defects such as cracks and pores,and there is no significant evaporation of Zn in the weld zone.The tensile strength of the welded joint reaches 400 MPa,which is 94% of that of the base metal,and the elongation is 33.89%,which is close to that of the base metal.The microhardness of the welded joint shows a W-shaped distribution,with the highest in the fusion zone,followed by the base metal zone,and the lowest in the heat affected zone.The extrusion effect during the welding leads to an increase of dislocation density in the weld,causing work hardening,which is the main reason affecting the hardness distribution of the welded joint.Compared with the base metal,the microstructure of the welded joint is significantly refined,with an average grain size of 1 μm,which is 50% of the base metal.In addition,small angle grain boundaries increase to 72%,large angle grain boundaries decrease to 28%,and twin boundaries decrease to 2%,further improving the mechanical properties of the welded joint.

关 键 词：高频感应焊 H65黄铜 超薄壁 显微组织 力学性能 

分 类 号：TG456.9[金属学及工艺—焊接]