Damage mechanism in weldment of 2.25Cr-1Mo steel under creep-fatigue loading |
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Authors: | Takashi Ogata Masatsugu Yaguchi |
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Affiliation: | Central Research Institute of Electric Power Industry, 2-11-1 Iwadokita, Komae, Tokyo 201-8511, Japan |
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Abstract: | The purpose of this study is to clarify damage process of “Type IV cracking” in weldment of a 2.25Cr-1Mo steel and to propose a micro damage prediction method. From continuous observation under a creep-fatigue test, it was found that spherical shape voids initiated and grew on grain boundaries in fine grain region and these voids grow continuously by changing their shape to crack-like. Both spherical and crack-like void growth rate equations were derived from the proposed void growth model. It was indicated that measured void growth rate under the creep-fatigue loading was well predicted by the growth rate equations. |
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Keywords: | 2 25Cr-1Mo steel Creep-fatigue Void growth Type IV crack Weld joint |
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