The influence of martensite content on the limit of spot welding current and the law of nugget microstructure transformation
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摘要: 采用中频逆变点焊机对1.2 mm厚不同马氏体含量的双相钢进行焊接，建立了点焊工艺窗口，分析了马氏体含量对焊接工艺和熔核组织的影响规律。分别采用光学显微镜、透射电子显微镜和维氏硬度计对焊点熔核区组织、显微硬度进行分析。结果表明，随着钢中马氏体含量的增加，工艺窗口向电流减小的方向偏移，Imin随马氏体含量的增加小幅度的减小，Imax大幅度的降低；熔核区组织为完全马氏体组织，随钢中马氏体含量的增加组织由板条马氏体转变为板条马氏体+孪晶马氏体组织，HAZ区硬度逐渐显示出软化特征。Abstract: In this paper,1. 2 mm dual-phase steel with different martensite content was welded with intermediate frequency inverter spot welder and welding process window was established,the influence of martensite content on welding process window was analyzed. The microstructure and microhardness of nugget were researched by OM,TEM and Vickers hardness tester. The results show that with the increase of the martensite content the welding process window is offset in the direction of current reduction,and Imin decreases by a small amount with the increase of martensite content,however Imax decreases a lot. The microstructure of the nugget is totally martensite. The microstructure changes from lath martensite to lath martensite plus twinned martensite with the increase of martensite content,Hardness in HAZ area gradually shows softening characteristics.
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Keywords:
- resistance welding /
- spot welding /
- martensite /
- welding process window /
- microstructure
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[1] Khan M S, Bhole S D, Chen D L, et al. Welding behaviour, microstructure and mechanical properties of dissimilar resistance spot welds between galvannealed HSLA350 and DP600 steels[J].Science and Technology of Welding and Joining, 2013, 14(7):616-625.
[2] Pouranvari M, Marashi S P H. Critical review of automotive steels spot welding:process, tructure and properties[J]. Science and Technology of Welding and Joining, 2013, 18(5):361-403.
[3] Sawanishi C, Ogura T, Taniguchi K, et al.Mechanical properties and microstructures of resistance spot welded DP980 steel joints using[J]. Science and Technology of Welding and Joining Pulsed Current Pattern, 2014, 19:52-59.
[4] 孙晓屿,黄雷,王武荣,等.DP780双相钢电阻点焊的数值模拟及试验验证[J].焊接学报,2016,37(4):85-88. [5] 王敏,吴毅雄,潘华,等. 母材成分对DP590 钢电阻点焊接头性能的影响[J]. 焊接学报,2010,31(2): 33-35. [6] 赵熹华.压力焊[M].北京:机械工业出版社,1999. [7] 张龙柱,任虎.三种典型汽车高强钢点焊工艺性研究[J].热加工工艺,2018, 38(15):172-183. [8] Gould J E, Khurana S P and Li T. Predictions of microstructures when welding automotive advanced highstrength steels[J].Weld.J. (Miami, Fla), 2006, 85:111-116.
[9] 刘旋,陈雨琳,陆兴, 等.不同碳含量碳钢淬火态马氏体精细结构[J].材料热处理学报,2018, 39(7):86-91. [10] 马跃新,吴煜,曾德长, 等.马氏体类型及其形成原因的探讨[J].材料热处理学报,2013, 34(4):155-161. [11] 计云萍,刘宗昌,任慧平.钢中马氏体的孪晶亚结构[J].材料热处理学报,2013,34(4):162-165. [12] Hernandez V H B, Panda S K, Okita Y, et al. A study on heat affected zone softening in resistance spot welded dual phase steel by nanoindentation[J].J Mater Sci, 2010(45):1638-1647.
[13] 刘军利,林晓娉,李日,等.碳对马氏体钢显微组织和力学性能的影响[J].材料热处理,2006,35(24):34-36. -
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