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논문 기본 정보

자료유형
학술저널
저자정보
Kaushal Kishore (Tata Steel Limited) Pankaj Kumar (National Institute of Technology) Goutam Mukhopadhyay (Tata Steel Limited)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.28 No.4
발행연도
2022.4
수록면
945 - 965 (21page)
DOI
10.1007/s12540-020-00939-8

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초록· 키워드

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Galvannealed (hot dip galvanized and annealed) dual phase (DP600) steel and interstitial free (IF) steel are two of the widelyused materials in automotive industries owing to their high specific strength, toughness, formability and corrosion resistance. This inevitably requires their joining to form larger components. Resistance spot welding has emerged as the predominantwelding technique for joining of sheet metals in automotive industries. There are complexities regarding microstructuralvariation of the fusion zone and across heat affected zones during spot welding of fundamentally dissimilar steels. This isfurther aggravated by the prospect of zinc redistribution during the welding process. Current study presents the evolution ofmicrostructure in different zones of welding in IF and DP600 steel. Micro-hardness profiles and electron back scattered diffractionstudies were performed. Furthermore, redistribution of elements in different welding zones is studied using electronprobe micro analysis. The effect of welding current and time on the nugget size and the strength of the weld during tensile?shear is determined. It was observed that there was an increase in nugget diameter and maximum load bearing capacity ofthe joint with an increase in heat input, until the occurrence of expulsion. Furthermore, critical nugget diameter for pull-outfailure was determined and existing empirical models were verified for the applicability in this case. None of the existingempirical models could predict the critical nugget diameter correctly and thus a new empirical relationship between sheetthickness and critical nugget diameter for zinc coated dissimilar steels has been proposed. Failure behaviour of the spotweldedsheets were studied under tensile?shear configuration under quasi-static and fatigue mode of loading and it showedsubstantial difference in location of crack initiation and fractographic features. Tensile?shear specimen at optimum weldingparameter failed from the base metal of the IF steel side with dimples on the fracture surface, whereas fatigue specimenfailed from the heat affected zone of the IF steel side with transgranular striations on the fracture surface.

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