Sensitivity of local cyclic deformation in lath martensite to flow rule and slip system in crystal plasticity

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Fischer, TimKTH,Materialvetenskap (författare)

Sensitivity of local cyclic deformation in lath martensite to flow rule and slip system in crystal plasticity

Artikel/kapitelEngelska2023

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Elsevier BV,2023
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LIBRIS-ID:oai:DiVA.org:kth-325591
https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-325591URI
https://doi.org/10.1016/j.commatsci.2023.112106DOI

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Språk:engelska
Sammanfattning på:engelska

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QC 20230412
The prediction of the cyclic deformation behaviour in lath martensite-based high-strength steels requires constitutive models that reflect the local stress and strain fields as accurately as possible. At the same time, the constitutive models should act as efficiently as possible in order to achieve the required high number of cycles in a finite time. Only few research works have studied the sensitivity of the local cyclic deformation in lath martensite to the power law-based flow rule (Hutchinson or Chaboche-Cailletaud) and the active body-centred cubic (bcc) slip systems ({110}(111) and {112}(111)) in the crystal plasticity finite element method (CPFEM). This paper, therefore, aims to provide some guidance in the selection of suitable flow rule and slip systems. Based on full-field micromechanical modelling of a medium-carbon steel under symmetric strain-controlled cyclic loading, it can be shown that the two most commonly used flow rules according to Hutchinson and Chaboche-Cailletaud are equally capable of predicting the local stress and strain distributions within the hierarchical martensitic microstructure. However, using the Hutchinson flow rule increases the computational performance for the quasi-rate-independent problem considered here. The local distributions found differ strongly from those in the parent austenitic microstructure. If plastic deformation is assumed not only on the slip systems {110}(111), as often done, but also on the {112}(111) type, a redistribution of the bimodal distributed local stresses occurs at a significantly lower stress level. The unimodal distributed local strains are less affected by this. In addition, it is found that slightly different critical resolved shear stress (CRSS) values for both slip system types influence the local stress and strain distributions less severely than the additional plastic slip activation in the material.

Ämnesord och genrebeteckningar

TEKNIK OCH TEKNOLOGIER Materialteknik Metallurgi och metalliska material hsv//swe
ENGINEERING AND TECHNOLOGY Materials Engineering Metallurgy and Metallic Materials hsv//eng
Lath martensite
Microstructure
Fe-C alloys
Crystal plasticity
Micromechanics

Biuppslag (personer, institutioner, konferenser, titlar ...)

Dahlberg, Carl F. O.,1980-KTH,Materialvetenskap(Swepub:kth)u11tguno (författare)
Hedström, Peter,1955-KTH,Materialvetenskap(Swepub:kth)u1hu0w18 (författare)
KTHMaterialvetenskap (creator_code:org_t)

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Ingår i:Computational materials science: Elsevier BV222, s. 112106-0927-02561879-0801

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Av författaren/redakt...: Fischer, Tim; Dahlberg, Carl F ...; Hedström, Peter, ...

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TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Materialteknik; och Metallurgi och m ...

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Av lärosätet: Kungliga Tekniska Högskolan

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