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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
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]
Total Authors: 6
Affiliation:
[1] Univ Sao Paulo, Escola Engn Lorena, BR-12602810 Lorena, SP - Brazil
[2] Ohio State Univ, Coll Engn, Columbus, OH 43221 - USA
Total Affiliations: 2
Document type: Journal article
Source: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING; v. 651, p. 507-516, JAN 10 2016.
Web of Science Citations: 19
Abstract

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)

FAPESP's process: 13/26506-8 - Study of microstructural evolution and its effects on magnetic and electric properties of two stainless steels (ODS-Eurofer and AISI 201)
Grantee:Maria Jose Ramos Sandim
Support Opportunities: Regular Research Grants