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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.)

Austenite reversion in AISI 201 austenitic stainless steel evaluated via in situ synchrotron X-ray diffraction during slow continuous annealing

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Author(s):
Souza Filho, I. R. [1] ; Almeida Junior, D. R. [1] ; Gauss, C. [1] ; Sandim, M. J. R. [1] ; Suzuki, P. A. [1] ; Sandim, H. R. Z. [1]
Total Authors: 6
Affiliation:
[1] Univ Sao Paulo, Lorena Sch Engn, BR-12602810 Lorena, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING; v. 755, p. 267-277, MAY 7 2019.
Web of Science Citations: 0
Abstract

In situ synchrotron X-ray diffraction was used to track real-time austenite reversion in AISI 201 austenitic stainless steel deformed to a true strain of 0.34 under tensile testing. The deformed material was continuously annealed from 100 degrees C up to 800 degrees C at a heating rate of 0.05 degrees C s(-1). Phase changes and microstrain partitioning were evaluated by means of the direct comparison method and modified Williamson-Hall plots, respectively. The microstructure of the deformed steel consists of gamma, epsilon- and alpha'-martensite with volume fractions of 0.24, 0.07, and 0.69, respectively. epsilon -> gamma reversion occurs within the temperature range of 150-400 degrees C through a shear mechanism. The starting (A(s)) and finishing (A(f)) temperatures for alpha' -> gamma reversion are 486 degrees C and 770 degrees C, respectively. Three stages were distinguished for this reaction. By evaluating the crystallite size of both gamma- and alpha'-phases, it can be inferred that alpha' -> gamma reversion is diffusion-controlled. Such results were corroborated by thermodynamic simulations to assess the driving force for gamma-formation. Microstructural aspects such as gamma-nucleation sites, in-grain misorientation, grain refinement, and crystallographic texture were investigated by means of electron backscatter diffraction. Fresh formed ultrafine austenite grains hold different crystallographic orientations than those of untransformed austenite. (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