Flow stress model considering the transformation-induced plasticity effect and the inelastic strain recovery behavior |
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Authors: | Hai-yan Yu Li Bao |
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Institution: | 1.School of Automotive Engineering,Tongji University,Shanghai,China |
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Abstract: | On the basis of continuum mechanics and the Mori-Tanaka mean field theory, a micro-mechanical flow stress model that considered
both the transformation-induced plasticity (TRIP) effect and the inelastic strain recovery behavior of TRIP multiphase steels
was presented. The relation between the volume fraction of constituent phases and plastic strain was introduced to characterize
the transformation-induced plasticity effect of TRIP steels. Loading-unloading-reloading uniaxial tension tests of TRIP600
steel were carried out and the strain recovery behavior after unloading was analyzed. From the experimental data, an empirical
elastic modulus expression is extracted to characterize the inelastic strain recovery. A comparison of the predicted flow
stress with the experimental data shows a good agreement. The mechanism of the transformation-induced plasticity effect and
the inelastic recovery effect acting on the flow stress is also discussed in detail. |
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Keywords: | |
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