Special Issue "Deformation-Induced Phase Transformations in Steels and Non-Ferrous Alloys"

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: 30 April 2018

Special Issue Editors

Guest Editor
Prof. Elena Pereloma

Professor of Physical Metallurgy, Director of UOW Electron Microscopy Centre, AIIM, Squires Way, Innovation Campus, University of Wollongong, North Wollongong, NSW 2500, Australia NSW 2500, Australia
Website | E-Mail
Interests: physical metallurgy; steels; phase transformations; Ti alloys; atom probe tomography; mechanical behaviour; recrystallization
Guest Editor
Dr. Ilana Timokhina

Institute for Frontier Materials, Deakin University, Geelong, VIC 3217, Australia
Website | E-Mail
Interests: physical metallurgy; thermo-mechanical processing; atom probe tomography; clustering; phase transformations; electron microscopy; strengthening mechanisms

Special Issue Information

Dear Colleagues,

Deformation-induced phase transformations commonly occur during processing or in-service of parts made from steels or non-ferrous alloys. Examples include, but are not limited to, deformation-induced ferrite formation in steels, transformations of austenite to ε or α martensite in steels, transformations of β phase in metastable Ti alloys to α’’ martensite or ω phase; transformation of ZrCu (B2) austenite to ZrCu martensite in ZrCu-based alloys; stress-induced hcp martensite formation in Co-based alloys from parent fcc phase; and cubic B2 → monoclinic B19' martensitic transformation in NiTi alloys. Such transformations may have a remarkable effect on work hardening behaviour and plasticity of materials.

Papers on recent advances in theoretical and experimental investigations and review papers on the effect of parent phase (phase stability, composition, grain size, morphology, texture) and external (strain, strain rate, deformation path, temperature) conditions on deformation-induced phase transformations and the resulting mechanical properties of materials are thought after for inclusion in this Special Issue.

Prof. Elena Pereloma
Dr. Ilana Timokhina
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Metals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1200 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Deformation-induced phase transformation
  • Stress
  • Strain
  • Deformation path
  • Phase stability
  • Transformation-induced plasticity
  • Microstructure characterisation
  • Modelling

Published Papers (2 papers)

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Research

Open AccessArticle The α → ω Transformation in Titanium-Cobalt Alloys under High-Pressure Torsion
Metals 2018, 8(1), 1; doi:10.3390/met8010001
Received: 10 November 2017 / Revised: 10 December 2017 / Accepted: 18 December 2017 / Published: 21 December 2017
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Abstract
The pressure influence on the α → ω transformation in Ti–Co alloys has been studied during high pressure torsion (HPT). The α → ω allotropic transformation takes place at high pressures in titanium, zirconium and hafnium as well as in their alloys. The
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The pressure influence on the α → ω transformation in Ti–Co alloys has been studied during high pressure torsion (HPT). The α → ω allotropic transformation takes place at high pressures in titanium, zirconium and hafnium as well as in their alloys. The transition pressure, the ability of high pressure ω-phase to retain after pressure release, and the pressure interval where α and ω phases coexist depend on the conditions of high-pressure treatment. During HPT in Bridgeman anvils, the high pressure is combined with shear strain. The presence of shear strain as well as Co addition to Ti decreases the onset of the α → ω transition from 10.5 GPa (under quasi-hydrostatic conditions) to about 3.5 GPa. The portion of ω-phase after HPT at 7 GPa increases in the following sequence: pure Ti → Ti–2 wt % Co → Ti–4 wt % Co → Ti–4 wt % Fe. Full article
Figures

Open AccessArticle Effect of Nitrogen on Deformation-Induced Martensitic Transformation in an Austenitic 301 Stainless Steels
Metals 2017, 7(11), 503; doi:10.3390/met7110503
Received: 15 October 2017 / Revised: 7 November 2017 / Accepted: 10 November 2017 / Published: 13 November 2017
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Abstract
The effect of nitrogen on deformation-induced martensitic transformation (DIMT) in metastable 301 austenitic stainless steel has been studied based on the inelastic deformation theory. DIMT is regarded here as continuous relaxation process of internal strain energy accumulated during inelastic deformation. Using the kinetics
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The effect of nitrogen on deformation-induced martensitic transformation (DIMT) in metastable 301 austenitic stainless steel has been studied based on the inelastic deformation theory. DIMT is regarded here as continuous relaxation process of internal strain energy accumulated during inelastic deformation. Using the kinetics equation based on the inelastic deformation theory the relationship between the volume fraction of transformed martensite and inelastic strain for DIMT has been successfully verified with the parameter representing the stability of austenite. The addition of nitrogen is experimentally found to increase austenite stability and the critical inelastic strain below which any DIMT is not observed to occur and to decrease the saturation volume fraction of α’ martensite. On the other hand, DIMT has been analyzed with its effect on stress-strain curve shape and mechanical properties in relation to the addition of nitrogen. The characteristic transition from sigmoidal to parabolic curve shape in stress-strain response has disappeared with the addition of nitrogen. Full article
Figures

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