Detection of the martensitic γ → α' a phase transformation on a metastable austenitic steel, using Spontaneous magnetic emission (SME)

Edgar Apaza Huallpa, Julio Capó Sanchez, Hélio Goldenstein

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

In this study samples from a metastable austenitic steel AISI 301 are tested in tension at room temperature in the presence of a magnetic emissions detection system. This steel is known for presenting strain-induced martensitic transformations (γ → ϵ and γ →α'). It was possible to follow the transformation to α' martensite induced by deformation thanks to the detection of magnetic pulses, similar to Magnetic Barkhausen Noise (MBN), but more intense, synchronized with the advance of the plastic deformation. The results indicate that the α' phase begins after the elastic part of the tensile test. The issue of magnetic pulses during the martensitic transformation, a phenomenon called SME (Magnetic Spontaneous Emission), had previously been described during cooling at cryogenic temperatures of metastable austenite. The results were discussed in light of results for Magnetic Barhausen Noise (MBN), X-ray diffraction and microstructures obtained before and after the tests.

Original languageEnglish
Title of host publicationPTM 2015 - Proceedings of the International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015
EditorsLong-Qing Chen, Matthias Militzer, Gianluigi Botton, James Howe, Chadwick Sinclair, Hatem Zurob
PublisherInternational Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015
Pages623-628
Number of pages6
ISBN (Electronic)9780692437360
StatePublished - 2015
Externally publishedYes
EventInternational Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015, PTM 2015 - Whistler, Canada
Duration: 28 Jun 20153 Jul 2015

Publication series

NamePTM 2015 - Proceedings of the International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015

Conference

ConferenceInternational Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015, PTM 2015
Country/TerritoryCanada
CityWhistler
Period28/06/153/07/15

Bibliographical note

Funding Information:
The Brazilian funding agencies for support (CNPq, CAPES-PROEX and FAPESP)

Keywords

  • AISI 301
  • Austenite metastability
  • Magnetic Barkhausen Noise (MBN)
  • Martensite
  • Spontaneous magnetic emission (SME)

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