About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
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Symposium
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Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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Presentation Title |
G-16: Bauschinger Effect and Strain Hardening of Polygonal Ferrite and Granular Bainite Occurring during Pipe-forming of Linepipe Steels |
Author(s) |
Dae Woong Kim, Wan-Keun Kim, Jin-ho Bae, Hyoung Seop Kim, Sunghak Lee |
On-Site Speaker (Planned) |
Dae Woong Kim |
Abstract Scope |
Linepipe steels complexly consisted of low-temperature transformation microstructures which individually affect the Bauschinger effect and strain hardening occurring during the pipe-forming. In this study, the yield strength of linepipe steels was predicted by competing Bauschinger effect and strain hardening. Yield drop (YD) and yield rise (YR) parameters were defined from cyclic simulation analyses of outer and inner walls of pipes to express more reasonably the Bauschinger effect and strain hardening, respectively. By combining the YD and YR, the variation in yield strength (Δσy) showed a down-and-up behavior and plausibly explained the relationship of Δσy and piping strain used in pipe-forming industries. The polygonal ferrite reduced the yield-strength reduction in the low pre-strain range, whereas the granular bainite expanded it. The yield strength prediction coupled with microstructural analyses provide a good idea for designing the yield strength of various steel pipes. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |