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오스테나이트계 고망간강에서 인장 특성과 피로거동에 미치는 변형유기상의 영향
최상민,권숙인 ( S . M . Choi,S . i . Kwun ) 한국열처리공학회 1994 熱處理工學會誌 Vol.7 No.4
The effect of grain size on the tensile properties and fatigue behavior of austenitic high Mn steel has been investigated. The recrystallized austenite grain size of the cold rolled high Mn steel was increased as the annealing temperature increased from 600℃ to 1000℃. Larger austenite grain size decreased the yield strength and the tensile strength, and increased the uniform elongation due to transformation of some austenite into twins or ε-martensite phase during deformation. Austenite grain refinement increased the tendency to form dislocation cells, instead. The specimen annealed at 1000℃ with large grain size showed lower fatigue crack propagation rate in low ΔK region due to rougher fracture surface caused by formation of deformation twins during fatigue at the crack tip region.