先进镀锌高强钢中液态金属脆化的研究进展及挑战  

Progress and challenge of liquid metal embrittlement in galvanized advanced high strength steel

作　　者：丁凯[1,2] 董武峰 王利 潘华[3,4] 雷鸣 高玉来 DING Kai;DONG Wufeng;WANG Li;PAN Hua;LEI Ming;GAO Yulai(State Key Laboratory of Advanced Special Steel,Shanghai University,Shanghai 200444,China;School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;Automobile Steel Research Institute,Baoshan Iron and Steel Co.,Ltd.,Shanghai 201900,China;State Key Laboratory of Development and Application Technology of Automotive Steels,Shanghai 201900,China)

机构地区：[1]上海大学省部共建高品质特殊钢冶金与制备国家重点实验室,上海200444 [2]上海大学材料科学与工程学院,上海200444 [3]宝山钢铁股份有限公司研究院汽车用钢研究所,上海201900 [4]汽车用钢开发与应用技术国家重点实验室,上海201900

出　　处：《钢铁研究学报》2022年第5期399-410,共12页Journal of Iron and Steel Research

摘　　要：先进高强钢广泛用于汽车车身结构,能够在保证车辆安全性的同时使整体车身减重,满足节能减排的要求,在汽车轻量化方面已凸显出巨大的应用潜力。通常汽车用高强钢板需要进行表面镀锌处理以提高车身结构的抗腐蚀能力。但镀锌高强钢板在点焊过程中容易产生液态金属脆化,降低焊接接头的承载性能。镀锌热成形高强钢在热成形过程中也会产生液态金属脆化,使其抗拉强度和伸长率明显降低。概述了先进镀锌高强钢板中的液态金属脆化现象及其产生原因和机制,并着重分析了液态金属脆化的影响因素。此外,结合最新的研究进展阐述了目前先进镀锌高强钢板中液态金属脆化面临的挑战并提出了可行的研究思路。Attributing to its great application potential in automobile lightweight, advanced high strength steel(AHSS) is extensively used in car white body, which can meet the demands of saving fuel and reducing exhaust emission by reducing the car weight while ensuring its safety. To increase the service life of vehicle structure, it is required to protect AHSS from corrosion, mostly by zinc(Zn)-based coating. However, advanced high strength steel with Zn coating is prone to liquid metal embrittlement(LME) during welding, resulting in the reduction of load-carrying property of the involved welded joints. Liquid metal embrittlement also occurs in galvanized hot stamping steel during hot-press forming process, which can deteriorate its mechanical property and resultantly limit its application. The LME occurred in galvanized AHSS sheets and its forming mechanism were reviewed, and the factors to cause LME were also emphatically analyzed. Combined with the recent investigations of LME in Zn-coated AHSS, the challenges were discussed and correspondingly the feasible research approaches were put forward.

关 键 词：先进高强钢 镀锌层 液态金属脆化 焊接 热成形 

分 类 号：TG174.44[金属学及工艺—金属表面处理] TG142.1[金属学及工艺—金属学]