Abstract
It has been said that σ phase degrades materials ; nevertheless, it is not clear how σ phase degrades materials. In order to clarify the meaning of σ phase degradation in a strength-of-materials sence, this paper evaluates the tensile, impact and fatigue properties of a cast stainless steel which contains approximately 10 wt% of σ phase. The results obtained are as follows : (1) The Charpy absorbed energy of the σ-phase-degraded stainless steel was greatly reduced even at room temperature. (2) The tensile properties of the steel such as 0.2% proof stess, tensile stress and elongation were not affected by σ phase. (3) The S-N diagram was not changed by the existence of σ phase in steel. The distribution of the maximum surface lengths of multiple small cracks in the degraded steel, however, was different from that in non-degraded steel.
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