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Study on Characteristics of Low Cycle Fatigue for High Alloy and Austenite Stainless Steel  

Kim, Y.C. (한전전력연구원)
Back, S.H. (한전전력연구원)
Publication Information
Journal of Power System Engineering / v.14, no.6, 2010 , pp. 29-34 More about this Journal
Abstract
As the steam temperature of fossil power plant boiler is increasing, the use of 9Cr-1Mo high alloy material is prevalent and it is needed to investigate the characteristics of low cycle fatigue for high alloy and austenite stainless steel that has used up to recently. As a result of test, in 9Cr-1Mo high alloy steel, the relation of strain and fatigue life is non-linear and the crack mode of low cycle fatigue is brittle but in the austenite stainless steel, that of strain and fatigue life is linear and the crack mode of low cycle fatigue is ductile. Comparing the fatigue life between high alloy and austenite stainless steel, there is no consistent characteristics as to strains. But the fatigue life of 9Cr-1Mo steel is longer by 25% than that of STS304 stainless steel in the relatively low, 0.3% strain. In the other strain, the fatigue life of two materials is similar.
Keywords
Low Cycle Fatigue; High Alloy Steel; Crack; Strain; Fatigue Life;
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