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Creep Behavior of High Temperature Prestrain in Austenitic 25Cr-20Ni Stainless Steels  

박인덕 (요코하마국립대학 공학연구원)
남기우 (부경대학교 재료공학부)
안석환 (부경대학교 기계공학부)
Publication Information
Journal of Ocean Engineering and Technology / v.16, no.3, 2002 , pp. 59-64 More about this Journal
Abstract
In the present study, we examined the influence of prestrain on creep strength of Class M alloy(STS310S) and Class A(STS310J1TB) alloys containing precipitates. Prestrain was given by prior creep at a higher stress than the following creep stresses. Creep behaviour before and after stress change and creep rate of pre-strained specimens were compared with that of virgin specimens. Pre-straining produced the strain region where the strain rate was lower than that of a virgin specimen both for STS310J1TB and STS310S steels. The reason for this phenomenon was ascribable to the viscous motion of dislocations, the interaction between dislocations and precipitates in a STS310J1TB steel, and the interaction of dislocations with sub-boundaries in a STS310S steen which has the higher dislocation density and smaller subgrain size resulted from pre-straining at higher stress.
Keywords
Prestrain; Strain Rate; Rupture Strain; Precipitates; Subgrain Size;
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