발간논문

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Vol.26, No.1, 62 ~ 73, 1988
Title
Phase Transformation by Fatigue in Austenitic stainless Steel
조윤성Y . S . Jo, 권숙인S . I . Kwun
Abstract
The effect of strain induced martensite on the fatigue behavior of AISI 304 austenitic stainless steel was investigated. During low cycle fatigue, the austenitic stainless steel showed a continuous cyclic hardening until fracture. The extent of cyclic hardening increased with decreasing austenite stability. The austenite stability was controlled by different aging time and temperature, which resulted in different carbide morphologies. The fatigue crack propagation rate near △K_(th) varied also with the austenite stability inside the plastic zone at the crack tip. Especially, the near-threshold fatigue crack propagation rate of the grain boundary carbide precipitated condition was the lowest. This was considered to be due to the roughnessinduced closure caused by intergranular facet. A new model for the intergranular facet formation and the fatigue crack propagation of grain boundary carbide precipitated condition was proposed.
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