1. 上海交通大学 上海市激光制造与材料改性重点实验室， 上海 200240；2. 上海交通大学 高新船舶与深海开发装备协同创新中心， 上海 200240;3. 宝山钢铁股份有限公司 宝钢研究院汽车用钢研究所， 上海 201900
出版日期:2019-06-28发布日期:2019-07-23作者简介:孔谅(1966-)，男，吉林省长春市人，副研究员，现主要从事电阻点焊、激光焊方面的研究. 电话(Tel.)：021-34202679；E-mail: ingerkongliang@sjtu.edu.cn.基金资助:国家重点研发计划资助项目(2017YFB0304400)Morphology and Distribution of the Liquid Metal Embrittlement Crack in the Resistance Spot Welded Joint of the Galvanized Q&P980 Steel
KONG Liang1,2,LING Zhanxiang1,2,WANG Ze1,WANG Min1,2,PAN Hua3,LEI Ming31. Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University, Shanghai 200240, China; 2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai 200240, China;3. Baosteel Central Research Institute, Baosteel Group Corporation, Shanghai 201900, China
Online:2019-06-28Published:2019-07-23摘要/Abstract
摘要： 当某些固态金属或合金与特定的液态金属或合金直接接触时，在拉伸应力的作用下会出现强度与延伸率下降，以致提前失效的现象，这种现象被称为液态金属脆化.铁与液态锌接触时会出现液态金属脆化.对新一代高强热镀锌Q&P980钢板进行电阻点焊试验之后，在焊接接头表面发现了裂纹，裂纹内充满了锌金属，认为该裂纹的出现是由于点焊过程中镀锌层熔化，在应力的作用下使钢出现了液态金属脆化现象.液态金属脆化裂纹主要分布在电极压痕区的台阶及外周，且具有不同的深度及形态.
关键词: 镀锌Q&P980钢； 电阻点焊； 液态金属脆化； 裂纹形态及分布
Abstract: When some solid metals or alloys are to directly contact with specific liquid metals or alloys in tensile stress, their strength and ductility will drop and early fracture will occur, such a phenomenon is known as liquid metal embrittlement (LME). Iron can be embrittled by liquid zinc. After carrying out resistance spot welding experiment on the galvanized high strength Q&P980 steel plates, cracks were detected on the surface of joint, those cracks were found to be filled with zinc, thus it could be assumed that the cracks were caused by LME phenomenon, as zinc coating was melted and stress existed during welding process. LME cracks mainly distribute on the step and periphery of the indentation, and they showed different depth and forms.
Key words: galvanized Q&P980 steel; resistance spot welding; liquid metal embrittlement (LME); morphology and distribution of crack
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