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Korean Journal of Metals and Materials > Epub ahead of print
황연정 · 이창욱 · 신가영 · 유지홍 · 최민수
합금화 용융아연도금 핫스탬핑강의 자동차 차체 적용을 위한 부식 거동, 액상금속취화현상 및 점용접성 연구
Received: 17 October 2018;  Accepted: 18 January 2019.  Published online: 8 February 2019.
ABSTRACT
The hot stamping process is beneficial for fabricating high strength automotive parts without spring back. To suppress high temperature oxidation and decarburization, it is necessary to coat the hot stamped steel. In the present work, the performance of galvannealed coated (GA) hot stamped steel was evaluated. During cyclic corrosion tests, the steel substrate began to corrode after the heat treated galvannealed coating fully corroded, because a Zn alloyed coating provides cathodic protection. In order to be applied to the automotive body-in-white, GA coated hot stamped steel must overcome drawbacks such as liquid metal embrittlement (LME) due to the low melting temperature of the Zn, and low or limited weldability due to the thick surface ZnO layer. The results of this study showed that an increase in the α-Fe(Zn) phase fraction of the coating was an effective way to prevent LME. In addition, the resistance spot weldability of GA hot stamped steel can be improved by removing the thick Zn oxide layer by sand blasting.
Keywords: hot stamping, galvannealed coating, cathodic protection, liquid metal embrittlement, resistance spot welding
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