New investigations on transformation induced plasticity and its interaction with classical plasticity

Taleb, Lakhdar; Petit, S.

doi:10.1016/j.ijplas.2005.03.012

Cited by 107 publications

(71 citation statements)

References 25 publications

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“…This leads to residual stresses whose global average is obviously zero. Since the transformation induced plastic strain rate proposed by Leblond is proportional to the global average deviatoric stress, zero transformation induced plasticity is predicted, in disagreement with experiments proposed by Taleb and Petit (2006). In this contribution, average stresses per phase are used instead of a global average stress, so that residual stress issues may be considered.…”

Section: Introductionmentioning

confidence: 89%

“…Furthermore, Petit-Grostabussiat et al (2004) proposed an experimental counterpart of the Leblond's model with respect to the possible recovery of strain hardening on the one hand and the classical plasticity due to thermal variations on the other hand. However, other tests performed by Taleb and Petit (2006) show that predictions of the Leblond's model are not qualitatively correct when pre-hardening (significantly higher than the yield stress of the soft phase) is applied to the test piece before starting the phase transformation. For instance, even for zero macroscopic applied stress, non negligible transformation induced plasticity is observed.…”

Section: Introductionmentioning

confidence: 99%

“…This enables to be consistent with the fact that one phase may have a yield stress lower than the others and does not necessarily sustain the macroscopic stress deviator. On the other hand this enables to take into account residual stress issues as in the experiments proposed by Taleb and Petit (2006). 4) The applied macroscopic stress is taken into account as a pre-stress in the calculation of the equivalent plastic strain, which is neglected by Leblond et al (1989) and Taleb and Sidoroff (2003).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…The experiment is extracted from [14]. Dilatometry tests have been performed under loading on a 16MND5 low carbon steel.…”

Section: Experiments With Thermal Cyclesmentioning

confidence: 99%

Experimental validation of the multiphase extended Leblond’s model

Weisz-Patrault

2017

AIP Conference Proceedings

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Abstract. Transformation induced plasticity is a crucial contribution of the simulation of several forming processes involving phase transitions under mechanical loads, resulting in large irreversible strain even though the applied stress is under the yield stress. One of the most elegant and widely used models is based on analytic homogenization procedures and has been proposed by . Very recently, a simple extension of the Leblond's model has been developed by . Several product phases are taken into account and several assumptions are relaxed in order to extend the applicability of the model. The present contribution compares experimental tests with numerical computations, in order to discuss the validity of the developed theory. Thus, experimental results extracted from the existing literature are analyzed. Results show a good agreement between measurements and theoretical computations.

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“…These tests have been mostly performed in a single transformation, such as from austenite to ferrite or martensite. Taleb and Petit (Taleb and Petit, 2006) also investigated the transformation plasticity in a multi-phase transformation. They predicted that the kinetics of transformation plasticity will be better represented by using the sum of the volume fraction of the new phases, although the transformation plastic strain in a double transformation (bainite+martensite) is larger than that in a single transformation (bainite).…”

Section: Introductionmentioning

confidence: 99%

Effect of ferrite phase fraction on bainite transformation plasticity in double transformation

Yanagisawa

Hosoya

Kishi

et al. 2017

Mechanical Engineering Journal

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Transformation plasticity significantly affects the stress distribution of a forging after heat-treatment. In this study, the transformation plasticity in a multi-phase transformation was measured experimentally. Two kinds of low-alloy steels were used: ASME SA508 and JIS SCM420. The materials were heat treated under different conditions to vary the phase fraction of ferrite. Then the transformation plastic strains of bainite were experimentally identified from the deviation between the stress-free total strain value and the strain value with an applied stress. After the tests were finished, an orientation microscopy was performed using EBSD. The grain average misorientation (GAM) values of the bainite phase become higher than those of the ferrite phase due to the bainite sub-unit. The volume fractions of ferrite were defined as the area lower than the threshold value of the GAM. The transformation plastic strain during the bainite transformation decreased with increasing volume fraction of ferrite. Although there is a quantitative difference in the transformation plastic strains between SA508 and SCM420, the normalized values give the same tendency in both materials. Furthermore, the calculated transformation plasticity using a multi-phase model shows a good agreement with the measurements. This result suggests that the transformation plasticity behavior of the bainite transformation is the same as between a single transformation (bainite) and a double transformation (bainite and ferrite).

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New investigations on transformation induced plasticity and its interaction with classical plasticity

Cited by 107 publications

References 25 publications

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

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

Experimental validation of the multiphase extended Leblond’s model

Effect of ferrite phase fraction on bainite transformation plasticity in double transformation

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