Special Issue "Physical Metallurgy of High Performance Steels"

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

Deadline for manuscript submissions: 31 October 2018

Special Issue Editor

Guest Editor
Prof. Dong-Woo Suh

Graduate Institute of Ferrous Technology (GIFT), Pohang University of Science and Technology (POSTECH), Korea
Website | E-Mail
Interests: phase transformation in ferrous alloys; alloy design and microstructure control for advanced high strength steel; degradation of ferrous alloys in non-friendly environment

Special Issue Information

Dear Colleagues,

Ever since human being started using alloys of iron, steels always have served as a backbone material for our society. It is possible because of endless evolution, making them exceptionally responsive to changes in social environments. Physical metallurgy primarily concerns the microstructure and mechanical properties of materials with their relationships. In this context, it is an essential subject for the persistent evolution of alloys of iron, creating a variety of novel high-performance steels. Recently, getting into more intensive competition with other structural alternatives, such as light metals or plastics, alloys of iron are required to make another quantum leap. This Special Issue attempts to compile efforts in the latest advances in the development of high-performance steels, particularly putting emphasis on fundamental and practical issues in physical metallurgy. Contributions are expected to navigate the everlasting evolution of steels in the future.

Prof. Dr. Dong-Woo Suh
Guest Editor

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

  • Steels

  • Microstructure

  • Mechanical behavior

  • Alloy design

  • Thermo-mechanical process

  • Phase transformation

Published Papers (2 papers)

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Research

Open AccessArticle Microstructural, Mechanical, and Electrochemical Analysis of Duplex and Superduplex Stainless Steels Welded with the Autogenous TIG Process Using Different Heat Input
Metals 2017, 7(12), 538; doi:10.3390/met7120538
Received: 1 November 2017 / Revised: 23 November 2017 / Accepted: 27 November 2017 / Published: 1 December 2017
Cited by 1 | PDF Full-text (16967 KB) | HTML Full-text | XML Full-text
Abstract
Duplex Stainless Steels (DSS) and Superduplex Stainless Steels (SDSS) have a strong appeal in the petrochemical industry. These steels have excellent properties, such as corrosion resistance and good toughness besides good weldability. Welding techniques take into account the loss of alloying elements during
[...] Read more.
Duplex Stainless Steels (DSS) and Superduplex Stainless Steels (SDSS) have a strong appeal in the petrochemical industry. These steels have excellent properties, such as corrosion resistance and good toughness besides good weldability. Welding techniques take into account the loss of alloying elements during the process, so this loss is usually compensated by the addition of a filler metal rich in alloying elements. A possible problem would be during the welding of these materials in adverse conditions in service, where the operator could have difficulties in welding with the filler metal. Therefore, in this work, two DSS and one SDSS were welded, by autogenous Tungsten Inert Gas (TIG), i.e., without addition of a filler metal, by three different heat inputs. After welding, microstructural, mechanical, and electrochemical analysis was performed. The microstructures were characterized for each welding condition, with the aid of optical microscopy (OM). Vickers hardness, Charpy-V, and cyclic polarization tests were also performed. After the electrochemical tests, the samples were analyzed by scanning electron microscopy (SEM). The SDSS welded with high heat input kept the balance of the austenite and ferrite, and toughness above the limit value. The hardness values remain constant in the weld regions and SDSS is the most resistant to corrosion. Full article
(This article belongs to the Special Issue Physical Metallurgy of High Performance Steels)
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Open AccessArticle Effect of Grain Size on Grain Boundary Segregation Thermodynamics of Phosphorus in Interstitial-Free and 2.25Cr-1Mo Steels
Metals 2017, 7(11), 470; doi:10.3390/met7110470
Received: 27 September 2017 / Revised: 23 October 2017 / Accepted: 31 October 2017 / Published: 2 November 2017
PDF Full-text (4562 KB) | HTML Full-text | XML Full-text
Abstract
Several grain sizes were obtained by heat treatment at different temperatures for interstitial-free (IF) and 2.25Cr-1Mo steels. Samples of the steels with different grain sizes were aged at 600 and 680 °C for IF steel and 520 and 560 °C for 2.25Cr-1Mo steel
[...] Read more.
Several grain sizes were obtained by heat treatment at different temperatures for interstitial-free (IF) and 2.25Cr-1Mo steels. Samples of the steels with different grain sizes were aged at 600 and 680 °C for IF steel and 520 and 560 °C for 2.25Cr-1Mo steel for sufficient time to achieve their equilibrium grain boundary segregation. The grain boundary concentrations of phosphorus were examined using Auger electron spectroscopy. At the same aging temperature, the boundary segregation of phosphorus increased with increasing grain size. The effect of grain size on equilibrium grain boundary segregation thermodynamics was analyzed based on the information of both grain size and phosphorus boundary concentration. The segregation enthalpy increased with increasing grain size and simultaneously the segregation entropy became less negative. Moreover, the segregation entropy (∆S) and enthalpy (∆H) of phosphorus in both IF and 2.25Cr-1Mo steels exhibited a unified linear relationship, being expressed as ∆S = 0.85∆H − 38.06, although it segregated to different types of grain boundaries (ferrite grain boundaries in IF steel and prior austenite grain boundaries in 2.25Cr-1Mo steel). With the aid of the acquired thermodynamic parameters and grain boundary segregation theories, the equilibrium segregation concentrations at different aging temperatures were modeled under different grain sizes for both steels. Full article
(This article belongs to the Special Issue Physical Metallurgy of High Performance Steels)
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