Etude et modélisation de l'effet du revenu sur les évolutions des microstructures, du comportement thermomécanique et des contraintes résiduelles de trempe

Abstract : The relaxation of the residual stress during the tempering process is strongly related to the evolutions of the microstructure and thermomechanical properties. Thus, the simulation of the evolution of residual stresses requests the coupling of the temperature field, the phase transformations and the stress and strain evolutions all along the process. In this work, firstly, a metallurgical model has been developed to describe the tempering kinetics: nucleation, growth (or dissolution) and coarsening of the epsilon carbide and the cementite. This model allows to predict the evolutions of the matrix composition, the type, size and distribution of the precipitates during the tempering of martensite for low and middle alloyed steels. Secondly, based on the microstructure parameters calculated by the metallurgical model, a thermomechanical model has been also developed to predict the evolution of the flow stress of tempered martensite. The thermomechanical model not only takes into account the different hardening mechanisms (solution hardening, precipitate hardening and the dislocation hardening), but also the effect of deformation temperature. An experimental validation of the two models has been performed for a 80MnCr5 steel using the results obtained by electron transmission microscopy and thermomechanical dilatometry. Finally, the metallurgical model and the thermomechanical model have been implemented into the finite element calculation software ZeBuLoN to simulate the evolution of internal stress during the quenching and tempering process. A first analysis of the stress relaxation during tempering has been performed.
Document type :
Theses
Complete list of metadatas

Cited literature [87 references]  Display  Hide  Download

https://hal.univ-lorraine.fr/tel-01752753
Contributor : Thèses Ul <>
Submitted on : Thursday, March 29, 2018 - 1:56:40 PM
Last modification on : Monday, April 16, 2018 - 10:42:54 AM

File

2006_WANG_Y.pdf
Files produced by the author(s)

Identifiers

  • HAL Id : tel-01752753, version 1

Collections

Citation

Yunning Wang. Etude et modélisation de l'effet du revenu sur les évolutions des microstructures, du comportement thermomécanique et des contraintes résiduelles de trempe. Autre. Institut National Polytechnique de Lorraine, 2006. Français. ⟨NNT : 2006INPL047N⟩. ⟨tel-01752753⟩

Share

Metrics

Record views

50

Files downloads

69