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[論文] 複合組織鋼의 衝擊破壤特性에 미치는 노치形狀 및 硬度比의 영향
김정규(J.K.Kim),유승원(S.W.You),김일현(I.H.Kim) 한국자동차공학회 1988 오토저널 Vol.10 No.2
Effect of Notch Shape and Hardness Ratio on Characteristics of Impact Fracture in Dual Phase Steels.<br/> In this study, it is investigated the effect of notch shape and hardness ratio on the charac-teristics of impact fracture in dual phase steels. The impact test was carried out at the tempera-ture range from -40℃ to room temperature with Instrumented Charpy Impact Tester.The main results obtained are as follows;<br/> 1.The maximum impact bending strength(σ_max)increases with the tensile strength. Also, the impact enerty depends on σ_max.<br/> 2.In room temperature, the impact energy depends on crack-initiation energy(E_i)in case of the high hardness ratio (R=3.4), whereas depends on crack-propagation energy(E_p)in case of the low hardness ratio(R=1.8)and the dependence of crack-initiation energy of the impact characteristics decreases with increasing test temperature.These phenomena are results from the difficulty of cleavage facet formation.