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Mechanical modeling of coupled plasticity and phase transformation effects in a martensitic high strength bearing steel
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).
2018 (English)In: Mechanics of materials (Print), ISSN 0167-6636, E-ISSN 1872-7743, Vol. 117, p. 41-57Article in journal (Refereed) Published
Abstract [en]

The stress and strain induced solid to solid phase transformation of retained austenite in a martensitic high strength bearing steel has been studied. Monotonic tension experiments that were carried out at different temperatures using this high strength steel showed that not only the strain induced but also the stress induced phase change plays a crucial role in the phase transformation of retained austenite to martensite. In the material model, plastic deformation was defined using the Drucker Prager yield surface through a nonassociated flow rule accompanied by nonlinear kinematic and isotropic hardening. The hardening was coupled with stress and strain induced phase transformations. A nonlinear elastic effect based on elastic dilation was included in the constitutive model by extending the bulk modulus with a second order term. For the finite element analysis, the material model was written as a user defined material subroutine (UMAT). The numerical simulations were done using ABAQUS and compared to monotonic tension, compression and cyclic experiments. The results showed that the strength differential effect and the volumetric change under loading are closely related to the transformation of retained austenite to martensite. At low temperatures the effect of stress induced phase transformation on yield strength was noticeable. It was concluded that at certain temperatures both strain and stress induced phase transformations significantly affect mechanical behavior of the high strength steel.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 117, p. 41-57
Keywords [en]
Nonassociated flow rule, Strain induced phase transformation, Strength differential effect, Stress induced phase transformation, Transformation induced plasticity
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-217542DOI: 10.1016/j.mechmat.2017.10.001Scopus ID: 2-s2.0-85032858248OAI: oai:DiVA.org:kth-217542DiVA, id: diva2:1157487
Note

QC 20171116

Available from: 2017-11-16 Created: 2017-11-16 Last updated: 2017-11-16Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
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  • vancouver
  • Other style
More styles
Language
  • de-DE
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  • nn-NB
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  • Other locale
More languages
Output format
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