In situ synchrotron X-ray evaluation of strain-induced martensite in AISI 201 austenitic stainless steel during tensile testing

Autor(es)

Gauss, C. ^[1] ; Souza Filho, I. R. ^[1] ; Sandim, M. J. R. ^[1] ; Suzuki, P. A. ^[1] ; Ramirez, A. J. ^[2] ; Sandim, H. R. Z. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Escola Engn Lorena, BR-12602810 Lorena, SP - Brazil

^[2] Ohio State Univ, Coll Engn, Columbus, OH 43221 - USA

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING; v. 651, p. 507-516, JAN 10 2016.
• Citações Web of Science: 19

Resumo

The formation of strain-induced martensite in AISI 201 austenitic stainless steel was followed by in situ synchrotron X-ray diffraction during tensile testing. Real-time information allowed tracking microstructural changes related to the decomposition of metastable austenite (gamma) into hcp-epsilon-martensite and bcc-alpha'-martensite. Approximately 78% of alpha'-martensite was found after an equivalent strain of 0.39 and a corresponding elongation of 0.70 in the analyzed region. Microstructural characterization was carried out using electron backscatter diffraction and scanning electron microscopy. The work hardening behavior of each phase was evaluated and a strain partitioning between martensite and austenite was observed. Microstrain in austenite increased with strain whereas it remained nearly unchanged in alpha'-martensite during the experiment. At the end of the test, these two phases showed similar values of microstrain. The formation of martensite and the accumulation of defects in austenite are responsible for the overall work hardening behavior. Kernel average misorientation analyses showed very similar values of stored elastic energy in austenite and alpha'-martensite. Orientation relationships among the phases close to [111]gamma//[0002]epsilon//[011]alpha' and < 110 > gamma// < 1120 > epsilon// < 111 > alpha' were found. (C) 2015 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 13/26506-8 - Estudo da evolução microestrutural e sua relação com propriedades magnéticas e elétricas de dois aços inoxidáveis (ODS-Eurofer e AISI 201)
• Beneficiário: Maria Jose Ramos Sandim
• Modalidade de apoio: Auxílio à Pesquisa - Regular