Experimental analysis of transformation plasticity

Taleb, Lakhdar

doi:10.1016/s0749-6419(99)00090-x

Cited by 106 publications

(77 citation statements)

References 5 publications

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“…During phase transformation, when stress is applied −even if it is smaller than its yield stress−, remarkable strain occurs ; the behaviour is called transformation plasticity. 1) Transformation plasticity is known to play an important role in steel making processes. For example, in the course of heat treatment process, transformation plastic deformation affects products' shape and residual stress.…”

Section: Introductionmentioning

confidence: 99%

Effect of Volume Expansion on Transformation Plasticity during Ferrite and Martensite Transformation of Steel

Otsuka

Akashi

Ogawa

et al. 2011

J. Soc. Mat. Sci., Japan

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Several kinds of carbon steels and Invar alloys are applied to identify the dependence of transformation volume expansion on transformation plasticity for both diffusive and non-diffusive transformation. It is confirmed by the experiments that the notion of Leblond's model (transformation volume expansion over yield stress of mother phase and transformation plastic coefficient has proportional relationship) appears to be good for both ferrite and martensite transformation. In addition, the experimental results of Invar alloys also support the idea that if the transformation volume expansion is significantly small, the transformation plastic strain becomes small accordingly. It is commonly said that Magee effect (selective martensite variant) plays a main role during martensite transformation. However, for steel treated in this paper, Greenwood-Johnson effect (transformation volume expansion) is also significant for martensite transformation.

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Section: Introductionmentioning

confidence: 99%

Effect of Volume Expansion on Transformation Plasticity during Ferrite and Martensite Transformation of Steel

Otsuka

Akashi

Ogawa

et al. 2011

J. Soc. Mat. Sci., Japan

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“…The purely volumetric transformation strain is proportional to the dilatation caused by changes in specific volumes of the phases during transformation. Transformation plasticity strain is the irreversible strain arising during a phase transformation when a stress is applied even below the yield strength of the weaker phase [14].…”

Section: Mechanical Modelmentioning

confidence: 99%

“…In relation (4) the strain rate term related to viscoplas-ticity is omitted as the applied stress is less than a quarter of the weaker phase yield strength: it has been demonstrated and reported in the scientific literature that the viscoplastic strain related to creep phenomena in this case may be considered as negligible [14]. In the experiments conducted in Gleeble, this condition is always respected.…”

Section: Mechanical Modelmentioning

confidence: 99%

“…Transformation plasticity is an irreversible strain that can be observed when solid state transformation occurs under small external stresses lower than the yield stress of the weaker phase [14]. During ring cooling, the thermal gradient due to non-uniform boundary conditions is responsible for non-simultaneous phase transformations inside the ring.…”

Section: Transformation Plasticitymentioning

confidence: 99%

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Thermo-mechanical-metallurgical model to predict geometrical distortions of rings during cooling phase after ring rolling operations

Casotto

Pascon

Habraken

et al. 2005

International Journal of Machine Tools and Manufacture

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The paper presents a validated numerical model able to predict geometrical distortions of rings during cooling phase after hot ring rolling operations. The model is capable to take into account the effects of all the phenomena resulting from the coupling of thermal, mechanical and metallurgical events. As simulation results strongly depend on the accuracy of input data, physical simulation experiments on real-material samples are developed and carried out to characterize material behaviour during phase transformation. The numerical model is then validated by an industrial case proving its effectiveness in predicting final ring distortions at room temperature.

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“…For instance Taleb et al (2001) developed an experimental setup to measure transformation induced plasticity in steels. Coret et al (2002Coret et al ( , 2004) developed a tension-torsion testing machine that enables to study transformation induced plasticity under multiaxial loads.…”

Section: Introductionmentioning

confidence: 99%

Multiphase model for transformation induced plasticity. Extended Leblond’s model

Weisz-Patrault

2017

Journal of the Mechanics and Physics of Solids

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To cite this version:Daniel Weisz-Patrault. Multiphase model for transformation induced plasticity. Extended Leblond's model. Journal of the Mechanics and Physics of Solids, Elsevier, 2017, 106, pp.152 -175 AbstractTransformation induced plasticity (TRIP) classically refers to plastic strains observed during phase transitions that occur under mechanical loads (that can be lower than the yield stress). A theoretical approach based on homogenization is proposed to deal with multiphase changes and to extend the validity of the well known and widely used model proposed by Leblond, J.-B., Devaux, J., and Devaux, J. (1989). Mathematical modelling of transformation plasticity in steels i: case of ideal-plastic phases. International journal of plasticity, 5(6):551-572. The approach is similar, but several product phases are considered instead of one and several assumptions have been released. Thus, besides the generalization for several phases, one can mention three main improvements in the calculation of the local equivalent plastic strain: the deviatoric part of the phase transformation is taken into account, both parent and product phases are elastic-plastic with linear isotropic hardening and the applied stress is considered. Results show that classical issues of singularities arising in the Leblond's model (corrected by ad hoc numerical functions or thresholding) are solved in this contribution excepted when the applied equivalent stress reaches the yield stress. Indeed, in this situation the parent phase is entirely plastic as soon as the phase transformation begins and the same singularity as in the Leblond's model arises. A physical explanation of the cutoff function is introduced in order to regularize the singularity. Furthermore, experiments extracted from the literature dealing with multiphase transitions and multiaxial loads are compared with the original Leblond's model and the proposed extended version. For the extended version, very good agreement is observed without any fitting procedures (i.e., material parameters are extracted from other dedicated experiments) and for the original version results are more qualitative.

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Experimental analysis of transformation plasticity

Cited by 106 publications

References 5 publications

Effect of Volume Expansion on Transformation Plasticity during Ferrite and Martensite Transformation of Steel

Effect of Volume Expansion on Transformation Plasticity during Ferrite and Martensite Transformation of Steel

Thermo-mechanical-metallurgical model to predict geometrical distortions of rings during cooling phase after ring rolling operations

Multiphase model for transformation induced plasticity. Extended Leblond’s model

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