铁素体基体球墨铸铁与08F钢搅拌摩擦搭接焊研究

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英文篇名：Friction Stir Lap Welding of Ferritic Nodular Graphite Cast Iron and 08F steel 作者：夏祥春 英文作者：XIA Xiangchun;Department of Electrical and Mechanical Engineering, Yongcheng Vocational College; 关键词：球墨铸铁 ; 搅拌摩擦搭接焊 ; 拉剪断裂载荷 ; 08F低碳钢 英文关键词：nodular cast iron;;friction stir lap welding;;tensile-shear fracture load;;08F low carbon steel 中文刊名：ZZJS 英文刊名：Foundry Technology 机构：永城职业学院机电工程系; 出版日期：2018-05-18 出版单位：铸造技术 年：2018 期：v.39;No.314 语种：中文; 页：ZZJS201805039 页数：4 CN：05 ISSN：61-1134/TG 分类号：131-134

摘要

对铁素体基球墨铸铁与08F低碳钢进行了搅拌摩擦搭接焊,利用拉伸试验机、扫描电子显微镜、显微硬度计研究搅拌头转速和进给速度对接头拉剪断裂载荷和显微组织的影响。结果表明,搅拌头转速为1 000 rpm时,焊缝试样拉剪断裂载荷较高,最高达8 000 N,断裂于08F低碳钢,在搅拌区的接合面附近存在高硬度马氏体,进给速度在40~70 mm/min范围内变化,对断裂载荷影响不大;搅拌头转速600 rpm时,在前进边和后退边的接合处均形成了珠光体组织,焊缝试样拉剪断裂载荷较低,断裂于搅拌区的球墨铸铁母材,为脆性断裂,因搅拌作用被拉长的石墨为裂纹扩展提供了条件。
        The friction stir lap welding was carried out on the ferrite nodular cast iron and 08 F low carbon steel. The tensile-shear fracture load of the weld joint was investigated by tensile testing machine. The microstructure of the welded joint was analyzed by SEM and microhardness tester. The results show that at high rotational speed of the FSW tool(1 000 rpm), a high tensile-shear fracture load(up to 8 000 N) of the specimen is obtained. The sample is broken on the08 F low carbon steel after the tensile-shear test because of the high hardness martensite near the joining surface in the stirring zone. The fracture load is almost not affected by feed rate(40~70 mm/min). At the low rotational speed of the FSW tool(600 rpm), the pearlite structure is formed at the junction of the advancing side and retreating side, and a lower tensile-shear fracture load of the specimen is obtained. The sample is broken on the nodular cast iron of the stirring zone after the tensile-shear test, which is brittle fracture. The crack propagation is promoted by graphite stretched by friction stirring.

引文

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