活塞铝合金惯性摩擦焊接接头的组织与性能研究  

Study on Microstructure and Properties of Inertia Friction Welding Joint of Piston Aluminum Alloys

作　　者：张广川 吴玮[1,2] 冯增建 邓展鹰 黄宏 殷相杰 戚浩杰 ZHANG Guangchuan;WU Wei;FENG Zengjian;DENG Zhanying;HUANG Hong;YIN Xiangjie;QI Haojie(School of Materials Science and Engineering,Chongqing University of Technology,Chongqing 400054,China;Chongqing Municipal Engineering Research Center of Institutions of Higher Education for Special Welding Materials and Technology,Chongqing 400054,China;Shandong Binzhou Bohai Piston Co.Ltd.,Binzhou 256602,China;Shaanxi Hande Axle Co.Ltd.,Baoji 722408,China)

机构地区：[1]重庆理工大学材料科学与工程学院,重庆400054 [2]重庆市特种焊接材料与技术高校工程研究中心,重庆400054 [3]山东滨州渤海活塞有限公司,山东滨州256602 [4]陕西汉德车桥有限公司,陕西宝鸡722408

出　　处：《热加工工艺》2021年第23期61-65,共5页Hot Working Technology

基　　金：重庆理工大学研究生科研创新项目资助(ycx20192035)。

摘　　要：采用惯性摩擦焊接技术对活塞用Al-Si-Cu-Mg-Ni铝合金进行了焊接,运用扫描电镜、能谱分析仪、X射线衍射仪、显微硬度测试、拉伸性能测试等手段分析了接头的组织变化、硬度分布以及室温拉伸性能。结果表明:经惯性摩擦焊后,焊缝区组织被细化,强化相破碎呈弥散状,整体沿径向分布;热机影响区组织在摩擦力和顶锻力的作用下被扭转挤压,呈流线型分布,部分强化相破碎成颗粒状,并伴有微裂纹产生;焊缝中存在Si、Al、Al-Cu-Ni等相,没检测到Mg_(2)Si和Al_(2)Cu,焊缝处硬度最高,为154HV;接头平均抗拉强度为178.9 MPa,达到母材的75%,断裂位置在热机影响区,断口呈现明显的解理断裂特征。Inertial friction welding technique was used to weld the Al-Si-Cu-Mg-Ni piston aluminum alloy. The microstructure change, hardness distribution and tensile properties of the joint at room temperature were investigated by means of scanning electron micro-scope, energy dispersive spectrometry, X-ray diffractometry, Vickers hardnes tester and tensile testing machine. The results show that after welding, the grains are refined in the weld zone, and the strengthened phases are broken and dispersively distributed along the radial direction. The microstructure of TMAZ is twisted and extruded under the friction and upsetting force, and it shows streamline accompanied by microcracks. There are Si, Al, Al-Cu-Ni phases in the weld zone, and Mg_(2)Si and Al_(2)Cu are not detected. The hardness of the weld zone is the highest, which reaches 154 HV. The average tensile strength of the joint can reach 178.9 MPa, as much as 75% of the base metal. The fracture location of the welded joints is TMAZ, the fracture has obvious cleavage fracture characteristics.

关 键 词：活塞 AL-SI合金 惯性摩擦焊 组织 拉伸性能 

分 类 号：TG453.9[金属学及工艺—焊接]