발간논문

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Vol.27, No.1, 32 ~ 40, 1989
Title
High temperature Low Cycle Fatigue Behavior of AISI 304L Stainless Steel Base Metal and Weldment
이수찬Soo Chan Lee, 남수우Soo Woo Nam
Abstract
Effects of tensile hold time on low cycle fatigue behaviors of AISI 304L stainless steel base metal and weldment were investigated at 823 K in Ar atmosphere. The weldment was prepared by the SMAW process with the welding direction parallel to the rolling direction. The microstructure of the barre metal and the weldment consisted of γ phase and duplex γ/δ-ferrite, respectively. The experimental results indicated that, with decreasing plastic strain amplitude, the fatigue life of weldment is significantly decreased, when it is compared with that of the base metal. This is considered to be caused by the microstructural differences between the base metal and the weldment. The results of tensile peak strain hold of 10 min show the decreased fatigue life compared with that of continuous cycling. This is considered to be caused by crack growth during tensile hold time.
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