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  Effects of martensitic transformability and dynamic strain age hardenability on plasticity in metastable austenitic steels containing carbon

Ogawa, T., Koyama, M., Tasan, C. C., Tsuzaki, K., & Noguchi, H. (2017). Effects of martensitic transformability and dynamic strain age hardenability on plasticity in metastable austenitic steels containing carbon. Journal of Materials Science: Materials in Electronics, 52(13), 7868-7882. doi:10.1007/s10853-017-1052-3.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-64D9-A Version Permalink: http://hdl.handle.net/21.11116/0000-0001-64DA-9
Genre: Journal Article

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 Creators:
Ogawa, Takuro1, Author              
Koyama, Motomichi2, Author              
Tasan, Cemal Cem3, Author              
Tsuzaki, Kaneaki2, Author              
Noguchi, Hiroshi2, Author              
Affiliations:
1Department of Mechanical Engineering, Faculty of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, Japan, persistent22              
2Department of Mechanical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan, ou_persistent22              
3Adaptive Structural Materials (Experiment), Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863382              

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Free keywords: STACKING-FAULT ENERGY; STAINLESS-STEEL; PHASE-TRANSFORMATIONS; MECHANICAL-PROPERTIES; DEFORMATION-BEHAVIOR; TENSILE DEFORMATION; EPSILON-MARTENSITE; STRENGTH; CR; DUCTILITYMaterials Science;
 Abstract: We investigated the effects of solute carbon concentration on the mechanical properties of Fe-19Cr-8Ni-0.05C and Fe-19Cr-8Ni-0.14C metastable austenitic steels. These steels showed an FCC(gamma) -> HCP(epsilon) -> BCC(alpha') martensitic transformation, resulting in transformation-induced plasticity (TRIP). The presence of excess solute carbon reduced the transformability because of an increase in the austenite stability. However, the work hardening capability was enhanced by a combined effect of the TRIP and dynamic strain aging (DSA). DSA requires a high diffusivity of carbon. Thus, the FCC (low diffusivity) to BCC (high diffusivity) transformation favors DSA. The hardening capability of BCC-martensite per volume is enhanced by the dislocation pinning and solution hardening effect of the carbon atmosphere, despite a decrease in the transformation rate per strain by carbon addition. Moreover, carbon addition stabilizes the deformation-induced HCP-martensite against the BCC-martensite, improving the hardening capability of the HCP-martensite through suppression of the window effect, which affects the plastic accommodation mechanism. According to our study, the steel with a low carbon content demonstrated extraordinary work hardening rates owing to a high transformation rate per strain. In contrast, the steel with a high carbon content showed sustained and high work hardening rates because of DSA. Both the steels showed approximately the same tensile strength, but completely different work hardening behavior.

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Language(s): eng - English
 Dates: 2017-07-01
 Publication Status: Published in print
 Pages: 15
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: ISI: 000399422000021
DOI: 10.1007/s10853-017-1052-3
 Degree: -

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Title: Journal of Materials Science: Materials in Electronics
  Other : J. Mater. Sci. - Mater. El.
Source Genre: Journal
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Publ. Info: London : Chapman and Hall
Pages: - Volume / Issue: 52 (13) Sequence Number: - Start / End Page: 7868 - 7882 Identifier: ISSN: 0957-4522
CoNE: /journals/resource/954925577043