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Korean Journal of Metals and Materials > Epub ahead of print
손 성 국, 황 연 정, 이 창 욱*, 유 지 홍, 최 민 수
핫스탬핑 열처리 온도가 Al-10% Si 도금 30MnB5 강의 점용접성에 미치는 영향
Received: 22 August 2019;  Accepted: 6 October 2019.  Published online: 8 October 2019.
ABSTRACT
Hot stamping is the most efficient manufacturing process to produce high strength automotive parts with reduced springback. Recently, 30MnB5 steel has been developed for hot stamping steel which can provide above 1700 MPa. However, resistance spot weldability of this steel is insufficient due to large amount of carbon addition. In present work, the effect of hot stamping heat treatment temperature on resistance spot weldability of Al-10% Si coated 30MnB5 was evaluated to improve resistance spot weldability of 30MnB5. In terms of nugget diameter, weldable current range, tensile shear strength and cross tension strength, the specimen heat treated at 850 ˚C showed better performance than the specimen heat treated at 950 ˚C. There was a coating microstructure difference between the specimens heat treated at 850 ˚C and 950 ˚C whereas both specimens had similar microstructure and mechanical properties of their substrates. The Fe-rich layer of the specimen heat treated at 950 ˚C was twice thicker than the specimen heat treated at 850 ˚C because the diffusion rate is much higher at 950 ˚C. Thick Fe-rich layer deteriorated resistance spot weldability due to high electrical resistivity during resistance spot welding.
Keywords: hot stamping, Al-10%Si coating, 30MnB5, resistance spot welding, dynamic resistance
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