TWIP Effect and Plastic Instability Condition in an Fe–Mn–C Austenitic Steel
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概要
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We investigated the correlation among deformation twin density, work hardening, and tensile ductility in an Fe–18Mn–1.2C twinning-induced-plasticity (TWIP) steel, and discussed the correlation with the plastic instability condition. The deformation twin density was varied by changing the deformation temperature from 123 to 523 K. An important factor for the uniform elongation is the work hardening rate in a later deformation stage. The increase in the deformation twin density enhanced the work hardening rate significantly but not monotonically just before the fracture, since the deformation twin density is saturated against plastic strain. In addition, dynamic strain aging in a later deformation stage and ε-martensitic transformation were found to accelerate the fracture due to the localized deformation and the premature fracture, respectively. Accordingly, the relationship between uniform elongation and deformation twin density was not simple. The optimum conditions for the TWIP effect were concluded to be (1) considerable amount of deformation twinning in a later deformation stage, (2) suppression of dynamic strain aging in a later deformation stage, and (3) inhibition of ε-martensitic transformation.
著者
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SAWAGUCHI Takahiro
National Institute for Materials Science
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TSUZAKI Kaneaki
National Institute for Materials Science
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Koyama Motomichi
National Institute for Materials Science
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- PREFACE
- Influence of Dislocation Separation on Dynamic Strain Aging in a Fe-Mn-C Austenitic Steel
- Influence of Processing Regimes on Fine-Grained Microstructure Development in an Al-Mg-Sc Alloy by Hot Equal-Channel Angular Pressing
- Quasi-cleavage Fracture along Annealing Twin Boundaries in a Fe-Mn-C Austenitic Steel
- Surface-Electrochemical Sensor for the Measurement of Anti-Cholinesterase Activity
- TWIP Effect and Plastic Instability Condition in an Fe–Mn–C Austenitic Steel
- TWIP Effect and Plastic Instability Condition in an Fe-Mn-C Austenitic Steel