Bainitic transformation under stress in medium alloyed steels

Veaux, M.; Louin, J.Ch.; Houin, J.P.; Denis, S.; Archambault, P.; Aeby‐Gautier, Elisabeth

doi:10.1051/jp4:2001423

Cited by 11 publications

(6 citation statements)

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“…The published results, on diffusion depending transformation or displacing transformation, show that the transformation of steel responds to external load both in change of the kinetics and in non-isotropic deformation called transformation induced plasticity [1,[4][5][6][7][8][9]. All published papers confirm that the stress accelerates the transformation and induces phase transformation plasticity.…”

Section: Models To Describe the Transformation Plasticitymentioning

confidence: 68%

Transformation plasticity at different phase transformations of bearing steel

Dalgic¹,

Löwisch²

2006

Mat.-wiss. u. Werkstofftech.

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Simulation of heat treatment processes presupposes that material data exist for the description of the phase transformation. During the heat treatment transformation and thermally caused stresses develop, which affect the behaviour of the phase transformation. The subject of this paper is the interaction between phase transformation and internal stress. The investigations show the influence of constant tensile loading on transformation strains occurring during the isothermal pearlitic and bainitic transformation and also the martensitic transformation of the bearing steel 100Cr6. The transformation plasticity parameter K increases during pearlitic transformation, with increasing transformation temperature linear, but decreasing for bainitic transformation with increasing temperature.

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Section: Models To Describe the Transformation Plasticitymentioning

confidence: 68%

Transformation plasticity at different phase transformations of bearing steel

Dalgic¹,

Löwisch²

2006

Mat.-wiss. u. Werkstofftech.

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“…First SEM observations of the microstructure formed at 350C under stress have shown that each austenite grain appears to transform into fewer variants of bainite, giving the microstructure a less random appearance [6]. For the samples transformed under very high stress (normalized stress of 2.…”

Section: Analysis Of the Microstructuresmentioning

confidence: 99%

Effect of tensile stresses on bainitic isothermal transformation

Veaux

Aeby‐Gautier

et al. 2003

J. Phys. IV France

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“…When the superimposed stress level exceeded the yield strength of the supercooled austenite the accelerated transformation was mainly associated with the introduction of new nucleation sites due to the plastic deformation of the supercooled austenite. As a result, finer bainite plates were expected [21,34]. Further high resolution TEM investigations are necessary in order to clarify this issue, which is, however, beyond the scope of the current work.…”

Section: Resultsmentioning

confidence: 98%

“…In particular, when the superimposed stress level during an isothermal bainitic transformation exceeds half the 0.2% offset yield strength of the supercooled austenite [32], the linear relationship between TP strain and superimposed stress level is replaced by a highly non-linear relationship [15,16,18,32]. Microstructure investigations revealed that preferred orientations were visible even for low stresses, indicating the coexistence of plastic accommodation mechanism (Greenwood Johnson approach) and the orientation effect (Magee approach) [16,18,33,34].…”

Section: Introductionmentioning

confidence: 99%

Evolution of transformation plasticity during bainitic transformation

Lambers

Tschumak

Maier

et al. 2011

International Journal of Materials Research

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The influences of prior austenitization treatment and state of applied stresses on the evolution of transformation plasticity (TP) strains during isothermal bainitic phase transformation and the resulting microstructures were examined. The key finding is that, upon pre-straining, the amount of TP strain under superimposed elastic stresses is dictated by both the prior austenite grain size (AGS) and the (0.01% offset) yield strength of the supercooled austenite. Furthermore, the superimposition of internal stresses present due to pre-straining and externally applied stresses results in TP strains similar to those obtained when a permanent stress equivalent to the 0.01% offset yield strength of the supercooled austenite is applied. Another important result is that lower TP strains were observed when decreasing the AGS, which is accompanied by an increase in grain boundary area per volume, hindering the growth of preferred variants. Overall, the results clearly lay out the influence of AGS and the particular 0.01% offset yield strength of the supercooled austenite in limiting the TP strains, which has to be incorporated into current models involving bainitic phase transformations.

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Bainitic transformation under stress in medium alloyed steels

Cited by 11 publications

References 0 publications

Transformation plasticity at different phase transformations of bearing steel

Transformation plasticity at different phase transformations of bearing steel

Effect of tensile stresses on bainitic isothermal transformation

Evolution of transformation plasticity during bainitic transformation

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