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Spontaneous and Deformation-Induced Martensite in Austenitic Stainless Steels with Different Stability
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Physical Metallurgy.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Physical Metallurgy.ORCID iD: 0000-0003-1102-4342
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Physical Metallurgy.ORCID iD: 0000-0002-7656-9733
2011 (English)In: STEEL RES INT, ISSN 1611-3683, Vol. 82, no 4, 337-345 p.Article in journal (Refereed) Published
Abstract [en]

The fraction and microstructure of spontaneous and deformation-induced martensite in three austenitic stainless steels with different austenite stability have been investigated. Samples were quenched in brine followed by cooling in liquid nitrogen or plastically deformed by uniaxial tensile testing at different initial temperatures. In-situ ferritescope measurements of the martensite fraction was conducted during tensile testing and complemented with ex-situ X-ray diffractometry. The microstructures of quenched and deformed samples were examined using light optical microscopy and electron backscattered diffraction. It was found that annealing twins in austenite are effective nucleation sites for spontaneous alpha'-martensite, while deformation-induced alpha'-martensite mainly formed within parallel shear-bands. The alpha'-martensite formed has an orientation relationship near the Kurdjumov-Sachs (K-S) relation with the parent austenite phase even at high plastic strains, and adjacent alpha'-martensite variants were mainly twin related (< 111 > 60 degrees or Sigma 3).

Place, publisher, year, edition, pages
2011. Vol. 82, no 4, 337-345 p.
Keyword [en]
austenitic stainless steels, deformation-induced martensitic transformation, electron backscattered diffraction (EBSD), spontaneous martensitic transformation
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-33943DOI: 10.1002/srin.201000118ISI: 000290050900005Scopus ID: 2-s2.0-79953703705OAI: oai:DiVA.org:kth-33943DiVA: diva2:421777
Note
QC 20110609Available from: 2011-06-09 Created: 2011-05-23 Last updated: 2012-03-22Bibliographically approved

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Borgenstam, Annika

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