About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
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Advances in Understanding of Martensite in Steels III
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| Presentation Title |
Dislocation behavior during yielding and strain-hardening of as-quenched martensitic steel |
| Author(s) |
Takumi Osanai, Hirotoyo Nakashima, Eisaku Sakurada |
| On-Site Speaker (Planned) |
Takumi Osanai |
| Abstract Scope |
The obstacles to dislocation motion in 0.1%C martensitic steel were investigated by analyzing stress-relaxation behavior at various applied stresses, from the elastic limit to the ultimate tensile strength. The internal stress arising from long-range obstacles, such as dislocation tangles, consistently accounted for more than 90% of the applied stress throughout the examined range of applied stress. The effective stress arising from short-range obstacles increased proportionally with the internal stress, suggesting that the short-range obstacles are associated with dislocation density, such as dislocation intersections. The effective stress was negligibly small at the elastic limit because the mobile dislocation density was high, and the distance a dislocation moved was too short to cause dislocation intersections.
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