An investigation into the reverse transformation mechanisms in the heat treatment of austenitic stainless steel

O’Sullivan, D. and Raghavendra, R. and Cotterell, M. and Mészáros, I. and Tanner, D. A. (2018) An investigation into the reverse transformation mechanisms in the heat treatment of austenitic stainless steel. Materials Performance and Characterization, 7 (4). ISSN 2165-3992

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Abstract

Cold working of austenitic stainless steel results in the formation of α0-martensite (ferromagnetic) within the host material (paramagnetic). The role of α0-martensite and carbide precipitation in the reverse transformation mechanism during the heat treatment of AISI 304 is presented. A magnetic Barkhausen noise (MBN) measurement technique was employed to characterize the transformation mechanisms. MBN was found to be an effective tool for studying the transformation mechanisms of austenite to α0-martensite during material deformation as MBN and the ferromagnetic phase showed a good correlation. AISI 304 specimens plastically strained to 51 % were subjected to annealing heat treatment (from 100°C to 1,100°C) for 30 minutes. The α0-martensite to austenite reversion mechanisms were found to have a significant effect on residual stress and materials magnetic properties, thus limiting MBN effectiveness in studying the reverse transformation process. Residual stresses go from tensile to compressive between 500°C and 600°C as a result of the transformation mechanisms, as the austenitic phase is larger than α0-martensite and therefore compresses the remaining α0-martensite. It is suggested that ε-martensite has a significant role in the dislocation structural mechanisms in the heat treatment of AISI 304.

Item Type: Article
Additional Information: Publisher Copyright: Copyright © 2018 by ASTM International.
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/2500/2503
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Depositing User: Admin SSL
Date Deposited: 19 Oct 2022 23:08
Last Modified: 07 Jun 2023 18:44
URI: http://repository-testing.wit.ie/id/eprint/4268

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