Microstructure and Mechanical Properties of Laser Welded Joints ofLZ92 Magnesium Lithium Alloy
摘 要
采用CO2激光焊接厚度为2 mm的LZ92镁锂合金板,研究了焊接接头的显微组织、物相组成、显微硬度与拉伸性能。结果表明:LZ92镁锂合金焊接接头成形良好,焊缝中无明显气孔、裂纹等缺陷;母材与焊缝的物相组成相同,由α相、β相和中间相Mg7Zn3组成;母材由等轴状β相和枝晶状与颗粒状α相组成,热影响区由粗大的β相和少量细小颗粒状α相组成,焊缝中大量细针状和细小颗粒状α相均匀分布在β相中,β相晶界消失;焊缝的硬度最高,母材的次之,热影响区的最低;焊接接头的抗拉强度为158 MPa,为母材的86.8%,断后伸长率为27%;焊接接头的拉伸断口位于影响区与焊缝间的熔合线处,断口由韧窝和解理面组成,断裂形式为混合型断裂。
Abstract
LZ92 magnesium lithium alloy plate with thickness of 2 mm was welded by CO2 laser, and the microstructure, phase composition, micro-hardness and tensile properties of the welded joint were studied. The results show that LZ92 magnesium lithium alloy welded joint had good formability, and no obvious pores and cracks were found in the weld. The phase composition of the base metal and the weld was the same, consisting of α phase, β phase and intermediate phase Mg7Zn3. The base metal was composed of equiaxed β phase and dendritic and granular α phase; the heat-affected zone was composed of coarse β phase and a few fine granular α phase; a large amount of fine needle and granular α phases evenly distributed in the β phase in the weld and the grain boundaries of β phase disappeared. The hardness of the weld was the highest, followed by the base metal, and the hardness of the heat affected zone was the lowest. The tensile strength of welded joint was 158 MPa, which was 86.8% that of the base metal, and the elongation was 27%. The tensile fracture of the welded joint was located at the fusion line between the heat-affected zone and the weld; the fracture was composed of dimples and cleavage surfaces, indicating the fracture form was a mixed fracture.
中图分类号 TG456.7 DOI 10.11973/jxgccl202101008
所属栏目 材料性能及应用
基金项目 广东省青年创新人才类项目(2019KQNCX228);广东科技学院重点项目(GKY-2016KYZD-6)
收稿日期 2019/10/28
修改稿日期 2020/8/28
网络出版日期
作者单位点击查看
备注姜炳春(1987-),男,福建三明人,讲师,硕士
引用该论文: JIANG Bingchun,FU Qin,HU Shaohua,TANG Lianyao,LIU Fangfang. Microstructure and Mechanical Properties of Laser Welded Joints ofLZ92 Magnesium Lithium Alloy[J]. Materials for mechancial engineering, 2021, 45(1): 46~49
姜炳春,付琴,胡少华,唐联耀,刘方方. LZ92镁锂合金激光焊接接头的显微组织与力学性能[J]. 机械工程材料, 2021, 45(1): 46~49
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【2】SUN Y H, WANG R C, PENG C Q, et al. Recent progress in Mg-Li matrix composites[J]. Transactions of Nonferrous Metals Society of China, 2019, 29(1):1-14.
【3】COUNTS W A, FRIÁK M, RAABE D, et al. Using ab initio calculations in designing bcc Mg-Li alloys for ultra-lightweight applications[J]. Acta Materialia, 2009, 57(1):69-76.
【4】李瑞红, 徐浩杰, 廖钧, 等. 退火温度对轧制态Mg-1Li-3Al-1Zn-0.3(Al5Ti1B)合金组织及力学性能的影响[J]. 金属热处理, 2017, 42(9):71-75. LI R H, XU H J, LIAO J, et al. Effect of annealing temperature on microstructure and mechanical properties of rolled mg-1li-3al-1zn-0.3(al5ti1b) alloy[J].Heat Treatment of Metals, 2017, 42(9):71-75.
【5】向庆. LA51和LA141镁锂合金的腐蚀与防护研究[D]. 重庆:重庆大学, 2017. XIANG Q. Study on the corrosion and protection of la51 and la141 mg-li alloys[D]. Chongqing:Chongqing University, 2017.
【6】ELKIN F M.镁锂超轻合金[M]. 张密林,译.北京:科学出版社,2010:35. ELKIN F M. Magnesium lithium ultralight alloy[M].ZHANG M L, Transl. Beijing:SCIENCE PRESS,2010:35.
【7】LIU X H, GU S H, WU R Z, et al. Microstructure and mechanical properties of Mg-Li alloy after TIG welding[J]. Transactions of Nonferrous Metals Society of China, 2011, 21(3):477-481.
【8】刘洋,刘旭贺,肖阳,等.LZ91镁-锂合金TIG焊接接头组织与性能的试验研究[J].轻合金加工技术,2017,45(1):61-68. LIU Y, LIU X H, XIAO Y, et al. Experimental research on the microstructure and mechanical properties of LZ91 Mg-Li alloy tig welded joint[J].Light Alloy Fabrication Technology, 2017, 45(1):61-68.
【9】张婧, 封小松, 张成聪, 等. 镁锂合金搅拌摩擦焊接工艺特性分析[J]. 焊接学报, 2017, 38(4):119-123. ZHANG J, FENG X S, ZHANG C C, et al. Investigation on friction stir welding of Mg-Li alloy[J].Transactions of the China Welding Institution, 2017, 38(4):119-123.
【10】吕俊霞, 杨武雄, 吴世凯, 等. Mg-9.8Li-2.9Al-Zn合金激光焊接接头组织与力学性能研究[J]. 中国激光, 2014, 41(3):0303001. LV J X, YANG W X, WU S K, et al. Microstructure and mechanical property of Mg-9.8Li-2.9Al-Zn alloy laser welded joint[J].Chinese Journal of Lasers, 2014, 41(3):0303001.
【11】刘旭贺, 姚玮, 刘洋, 等. LZ91镁-锂合金激光焊接接头的组织与性能[J]. 轻合金加工技术, 2016, 44(8):59-65. LIU X H, YAO W, LIU Y, et al. Microstructure and mechanical properties of laser welded joints of LZ91 Mg-Li alloy[J].Light Alloy Fabrication Technology, 2016, 44(8):59-65.
【12】余文祥. LZ91镁锂合金激光焊接工艺研究[D]. 武汉:华中科技大学, 2018. YU W X. Study on laser welding technology of LZ91 Mg-Li alloy[D]. Wuhan:Huazhong University of Science and Technology, 2018.
【13】姜炳春,王淑萍,刘方方,等.挤压比对LZ92双相镁锂合金组织与力学性能的影响[J].有色金属工程,2017,7(1):20-24. JIANG B C, WANG S P, LIU F F, et al. Effect of extrusion ratio on microstructure and mechanical properties of LZ92 duplex magnesium lithium alloy[J].NONFERROUS METALS ENGINEERING, 2017, 7(1):20-24.
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