ZK60镁合金CO2激光焊接接头的显微组织与性能
Microstructure and Properties of Welded Joint of ZK60 Magnesium Alloy Welded by CO2 Laser Welding
摘 要
采用CO2激光焊对ZK60镁合金薄板进行焊接试验, 研究了焊接接头各区域的显微组织、焊缝的相组成以及焊接接头的性能。结果表明: ZK60镁合金焊接接头出现了明显的半熔化区, 焊缝狭窄、成形良好; 焊缝区主要由细小的等轴晶组成, 在晶界和晶粒内部存在大量母材中没有的颗粒状MgZn和MgZn2析出相; 焊接接头的抗拉强度可达到母材强度的81.1%, 焊缝硬度为66 HV, 略低于母材的。
激光焊接
显微组织
magnesium alloy
laser welding
microstructure
Abstract
The CO2 laser welding was used to weld ZK60 magnesium alloy sheets, and the microstructure of different zones in the welded joint, phase compositions of the weld seam and the properties of weld joint were studied. The results show that the obvious partial melted zone appeared in the weld seam of ZK60 magnesium alloy, the weld seam was narrow and its forming was good. The microstructure of weld seam zone was composed of fine equiaxed grains, and the MgZn, MgZn2 precipitated phases were found at grain boundaries and in grains, which were not exist in the base metal. The tensile strength of the welded joint could achieve 81.1% of the base metal, and the hardness of the weld seam was 66 HV, and which was slightly lower than that of the base metal.
中图分类号 TG456.7
所属栏目 试验研究
基金项目 湖南省教育厅科研项目(09C892)
收稿日期 2011/9/19
修改稿日期 2012/6/15
网络出版日期
作者单位点击查看
备注谢丽初(1966-), 女, 湖南冷水江人, 讲师, 硕士。
引用该论文: XIE Li-chu,CHEN Zhen-hua,QUAN Ya-jie. Microstructure and Properties of Welded Joint of ZK60 Magnesium Alloy Welded by CO2 Laser Welding[J]. Materials for mechancial engineering, 2012, 36(9): 11～13
谢丽初,陈振华,全亚杰. ZK60镁合金CO2激光焊接接头的显微组织与性能[J]. 机械工程材料, 2012, 36(9): 11～13
被引情况:
【1】徐学利,王纯,侯军才,张超, "ZK60镁合金的炉中钎焊工艺",机械工程材料 39, 35-38(2015)
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参考文献
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【2】CAM G L. Development in laser welding of metallic materials and characterization of the joints[J].Welding in the World, 1999, 43: 13-26.
【3】MIN Dong, SHEN Jun, LAI Shi-qiang, et al. Effects of heat input on the low power Nd: YAG pulse laser conduction weldability of magnesium alloy AZ61[J].Optics and Lasers in Engineering, 2011, 49: 89-96.
【4】MUNITZ A, COTLER C, STERN A, et al.Mechanical properties and microstructure of gas tungsten arc welded magnesium AZ91D plates[J].Material Science and Engineering A, 2001, 302(1): 68-73.
【5】MARYA M, REDWARDS G. Factors controlling the magnesium weld morphology in deep penetration welding by CO2 laser[J].Journal of Materials Engineering Performance, 2001, 10(4): 435-443.
【6】ZHAO H, DEBROY T. Pore formation during laser beam welding of die-cast magnesium alloy AM60B-Mechanism and remedy[J].Welding Joumal, 2001, 80(8): 204-210.
【7】全亚杰, 陈振华, 黎梅, 等.变形镁合金AM60薄板激光焊的组织与性能[J].中国有色金属学报, 2007, 17(4): 525-529.
【8】李德君, 刘平, 董企铭, 等.变形工艺对AZ31B镁合金薄板组织与力学性能的影响[J].热加工工艺, 2008, 37(8): 4-7.
【9】AVEDESIAN M M, BAKER H. ASM specialty handbook-magnesium and magnesium alloys[M].USA: ASM International Metals Park, 1999: 12-23.
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