SABC1470 자동차 판의 기계적 성질과 합금층에 미치는 핫 스탬핑 공정의 영향

Effect of Hot Stamping Condition on the Mechanical Properties and Alloyed Layer of SABC 1470 Automotive Steel Sheet

This study was conducted to obtain the necessary data to develop the optimal manufacturing process for the PHS products using a hot-stamping technique which utilizes an SABC 1470 steel plate alloyed with 5~11% Si-Al. The hardness and tensile property requirements were mostly satisfied with high temperature and long-term heat treatment. The elongation rate and alloyed layer were satisfied under all the conditions tested. Under various conditions, the micro-organization of the hot-stamped steel plates consisted of a small amount of ferrite and martensite over time, and in some cases a very small amount of pearlite was present. All the properties were dependent on the microstructure of the steel plate. As the amount of ferrite increased, the elongation rate increased and the hardness and the intensity decreased. If the required hardness and intensity were not met, the ferrite existed with the martensite. The ferrite significantly influenced the tensile strength and elongation rate; however, its impact on hardness was insignificant. The greater the thickness, the higher the temperature and the longer the time required. Some cracks were created in the alloyed layer under the above-mentioned working conditions. The increase in the heating temperature and the longer heating time increased the thickness of the alloyed layer. This increased thickness has a significant effect on time rather than the heating temperature.