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핫스탬핑용 보론 강판의 고온인장 특성 및 수냉 조건에 따른 기계적 특성에 관한 연구
제환일(Hwan-Il Je),남기우(Ki-Woo Nam),김대용(Dae-Yong Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
The hot stamping technique is expected to be able to ensure the required property at parts of car body, the safety and the light weight. Boron steel is the one of the materials for hot stamping. Boron steels have a very small amount of boron to improve hardenability of the steel. This boron exists as a solid solution in austenite, and it plays important role to improve hardenability. The purpose of this study is to show the high temperature tensile characteristic and to investigate mechanical properties and micro-structure according to the heat-treatment conditions. The water quenching from the verious temperature was conducted under the different-elapsed time as a heat-treatment. Therefore, these property values can be a practical data to use boron steels for hot stamping.
핫스탬핑용 보론 강판의 열처리 조건에 따른 재질분석 및 점용접 특성 연구
제환일(Hwan Il Je),손창석(Chang Suk Son),남기우(Ki Woo Nam) 대한기계학회 2011 大韓機械學會論文集A Vol.35 No.4
최근 차체 경량화를 위한 여러 가지 방법 가운데 고온에서 가공하여 성형성을 확보하고, 이후 열처리를 통하여 고강도를 가질 수 있는 프레스 열간 성형 및 핫스탬핑 기술이 각광을 받고 있으며, 이에 따라 핫스탬핑용 재료인 보론 첨가 강판의 수요도 늘어나고 있는 추세이다. 본 연구에서는 핫스탬핑용 보론 첨가 강판의 우수한 경화능을 보이는 임계 최적 열처리 조건을 파악하고자, Al+Si 코팅이 된 보론 강판을 각기 다른 온도로 열처리하여 수냉 조건에 따른 기계적 특성 및 조직을 관찰하였다. 또한, 이 결과를 토대로 선별된 기계적 특성이 우수한 보론강 시험편과 일반 냉연 강판인 SPRC 340과 SPRC 590 2종류의 상대재를 활용하여 특정 점용접 조건에서 용접을 실시하고, 보론강 및 상대재의 기계적 특성 변화에 따른 용접 후의 기계적 특성 및 조직, 그리고 코팅층 유무에 따른 특성 변화를 연구하였다. The hot-stamping technique is used to manufacture high-strength parts by press forming by heating at a temperature above the Austenite transformation temperature and then rapid cooling. Boron steel, which contains a very small amount of boron, is one of the materials used for hot stamping. The purpose of this study is to show the microstructures and to investigate the mechanical properties under different heat-treatment conditions. The heat treatment of water quenching was conducted at the various temperatures and different elapsed times. These can be practical data useful when boron steels are used for hot stamping. Furthermore, the microstructures and mechanical properties of the spot-welded specimen with coatings and counterpart materials (SPRC 340, SPRC 590) is investigated in order to determine the welding characteristics of boron steel at different welding condition.
제환일(Hwan-Il Je),이문용(Mun-Yong Lee),김태일(Tae-Il Kim),안석환(Seok Hwan Ahn),남기우(Ki-Woo Nam) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
Recently, the optimal process has been conducted to reduce the cost and cycle time for production and the proper materials, such as boron steels, are applied to automotive parts in order to reduce the weight and improve fuel efficiency. Boron steels have a very small amount of boron to improve hardenability of the steel. This boron exists as a soild solution in austenite, and it plays an important role to improve hardenability. The hot stamping technique is expected to be able to ensure the required property at parts of car body, the safety and the light weight. Therefore, the purpose of this study is an application for mass production by using the merit of hot stamping technique. This study shows the mechanical properties, microstructure and welding characteristics of boron added steels for hot stemping in specific heat treatment and welding condition. These property values can be a basic data for evaluation of boron steels.