複合組織鋼의 衝擊破壞擧動에 영향 을 주는 마르텐사이트 體積率의 效果

Effects of the Martensive Volume Fraction on the Behavior of Impact Fracture of Dual Phase Steels

Use of dual phase steel are growing for its high strength and light weight in automobiles. The effect of the martensite volume fraction with various impact velocities on the strength, ductility and absorbed energy of dual phase (ferrite-martensite) steels were investigated in low carbon 1.5% Mn steels which were soaked at 700.deg. C, 730.deg. C, 780.deg. C, and brine quenched. Both the yield load and the maximum impact load increased when the martensite volume fraction increased, the loading time and the absorbed energy of the specimen decreased when the martensite volume fraction increased.