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미세구조가 균열개시인성 J ic 와 균열성장인성 T r 에 미치는 영향
오태성,Ritchie, R O 대한금속재료학회(대한금속학회) 1993 대한금속·재료학회지 Vol.31 No.10
Microstructural effects on crack initiation toughness (J_(IC)) and crack growth toughness (T_R) have been examined for HP9-4-20 steel and ASTM A710 steel. Microstructural changes, which increased the fracture strain (ε_f) and decreased the yield strain (ε_o), improved both J_(IC) and T_R, and had the larger effect on T_R for ASTM A710 steel with law strength. Observation of crack profiles revealed a zig-zag fracture which propagated along the spiral slip lines emanating from the blunted crack tip for ASTM A710 steel, and along the straight slip lines characteristic of a non-blunted crack for HP9-4-20 steel.