Search for Articles:
Title / Keyword
Author / Affiliation / Email
Journal
Article Type
 
 
Advanced Search
 
Section
Special Issue
Volume
Issue
Number
Page
 
4.4
2.9
Journals
Metals
Special Issues
New Horizons in High-Temperature Deformation of Metals and Alloys
share announcement

New Horizons in High-Temperature Deformation of Metals and Alloys

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Metal Casting, Forming and Heat Treatment".

Deadline for manuscript submissions: closed (30 June 2022) | Viewed by 7908

Special Issue Editors

Prof. Dr. Stefano Spigarelli

E-Mail Website
Guest Editor
Department of Industrial Engineering and Mathematical Sciences, Marche Polytechnic University, Via Brecce Bianche, I-60131 Ancona, Italy
Interests: creep; high-temperature deformation and hot working; steels; light alloys; metal matrix composites
Special Issues, Collections and Topics in MDPI journals
Dr. Chiara Paoletti

E-Mail Website
Guest Editor
Department of Industrial Engineering and Mathematical Sciences, Marche Polytechnic University, Via Brecce Bianche, I-60131 Ancona, Italy
Interests: creep; deformation of metals and alloys; material characterization; additive manufacturing

Special Issue Information

Dear Colleagues,

As a result of rapid technological advances in the field, understanding the high-temperature deformation of metals and alloys remains a key issue in terms of addressing the problems related to the optimization of both production and industrial applications. With the introduction of innovative technologies such as additive manufacturing, the microstructures of alloys can be altered in novel ways. This poses new problems as regards estimating the high-temperature strength of these materials, whose behavior was thought to be fully characterized. The introduction of new constitutive equations for the description of the creep response of metals and alloys, based on the physics of these materials and with the aim of replacing traditional phenomenological approaches, is just another example of many recent interesting developments. We can thus undoubtedly conclude that much remains to be investigated in this field, thanks to the rapid advances in technology and material science. This Special Issue of MDPI seeks to bring together articles focusing on the most recent developments related to the different aspects and mechanisms of the high-temperature deformation of metals and alloys.

Prof. Dr. Stefano Spigarelli
Dr. Chiara Paoletti
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 submissions that pass pre-check are 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 2600 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

  • creep
  • hot working
  • high-temperature deformation
  • high-temperature strength
  • metals
  • alloys
  • microstructure
  • constitutive equations

Published Papers (4 papers)

Download All Papers
Order results
Result details
Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:

Research

Jump to: Review

13 pages, 5914 KiB  
Article
Effect of Post-Processing Heat Treatments on Short-Term Creep Response at 650 °C for a Ti-6Al-4V Alloy Produced by Additive Manufacturing
by Chiara Paoletti, Marcello Cabibbo, Eleonora Santecchia, Emanuela Cerri and Stefano Spigarelli
Metals 2022, 12(7), 1084; https://doi.org/10.3390/met12071084 - 24 Jun 2022
Cited by 2 | Viewed by 1216
Abstract
Post-processing heat treatments of Ti-6Al-4V parts produced by additive manufacturing are essential for restoring the peculiar martensitic structure that originates from the extremely high cooling rates typical of this technology. In this study, the influence of a 1050 °C annealing on a Ti-6Al-4V [...] Read more.
Post-processing heat treatments of Ti-6Al-4V parts produced by additive manufacturing are essential for restoring the peculiar martensitic structure that originates from the extremely high cooling rates typical of this technology. In this study, the influence of a 1050 °C annealing on a Ti-6Al-4V alloy, produced by additive manufacturing, on the minimum creep rate dependence on applied stress and temperature, was investigated at 650 °C. Experimental data obtained after two different subcritical annealings were also considered for comparison purposes. The analysis of the experimental creep data demonstrated that the alloy annealed at the highest temperature exhibited lower creep rates. The improved creep response was attributed to the combined effect of the presence of extended α-β interfaces and of a small volume fraction of Ti3Al particles. Full article
(This article belongs to the Special Issue New Horizons in High-Temperature Deformation of Metals and Alloys)
►▼ Show Figures

Figure 1

10 pages, 4037 KiB  
Article
On the Short-Term Creep Response at 482 °C (900 °F) of the 17-4PH Steel Produced by Bound Metal Deposition
by Valerio Di Pompeo, Alberto Santoni, Eleonora Santecchia and Stefano Spigarelli
Metals 2022, 12(3), 477; https://doi.org/10.3390/met12030477 - 11 Mar 2022
Cited by 2 | Viewed by 2031
Abstract
The creep response of the 17-4PH precipitation hardening steel produced by a new additive manufacturing technology (Bound Metal Deposition) was investigated at 482 °C (900 °F), under stresses ranging from 350 to 600 MPa. Two different sets of samples produced with different deposition [...] Read more.
The creep response of the 17-4PH precipitation hardening steel produced by a new additive manufacturing technology (Bound Metal Deposition) was investigated at 482 °C (900 °F), under stresses ranging from 350 to 600 MPa. Two different sets of samples produced with different deposition parameters were considered. Prior heat treatment consisted of ageing either at 482 °C (state H900) or at 621 °C (H1150). The minimum creep rate and time to rupture dependencies on applied stress were obtained. The creep response in terms of time to rupture under a given stress, in particular, was compared with the only other available literature dataset on a similar steel processed by traditional technologies. The analysis of the experiments demonstrated that the presence of dispersed defects causes, in the Bound Metal Deposited steel, a substantial reduction (35–40%) of the creep strength. Full article
(This article belongs to the Special Issue New Horizons in High-Temperature Deformation of Metals and Alloys)
►▼ Show Figures

Figure 1

7 pages, 1198 KiB  
Article
Large-Strain Softening of Metals at Elevated Temperatures by Deformation Texture Development
by Michael E. Kassner and Roya Ermagan
Metals 2021, 11(7), 1059; https://doi.org/10.3390/met11071059 - 30 Jun 2021
Cited by 1 | Viewed by 1504
Abstract
Many (if not a majority) of metals and alloys evince substantial softening with torsion deformation to strains not usually achievable in tension. Of course, softening has long been observed by discontinuous dynamic recrystallization (DDRX) but this paper will discuss cases where softening is [...] Read more.
Many (if not a majority) of metals and alloys evince substantial softening with torsion deformation to strains not usually achievable in tension. Of course, softening has long been observed by discontinuous dynamic recrystallization (DDRX) but this paper will discuss cases where softening is associated by texture development with large-strain deformation that is not reliant on changes in the dislocation density. This paper discusses the work of the current authors on FCC metals and alloys and extends to a new discussion of BCC and HCP cases. The analysis of the basis for torsional softening in BCC steel and HCP Zr discussed here is a novel concept that has not been addressed in the literature before. Full article
(This article belongs to the Special Issue New Horizons in High-Temperature Deformation of Metals and Alloys)
►▼ Show Figures

Figure 1

Review

Jump to: Research

20 pages, 4877 KiB  
Review
Formation of Cells and Subgrains and Its Influence on Properties
by Rolf Sandström
Metals 2022, 12(3), 497; https://doi.org/10.3390/met12030497 - 15 Mar 2022
Cited by 10 | Viewed by 2382
Abstract
During plastic deformation, cells and subgrains are created in most alloys. This is collectively referred as the formation of a substructure. There is extensive qualitative information about substructures in the literature, but quantitative modeling has only appeared recently. In this paper, basic models [...] Read more.
During plastic deformation, cells and subgrains are created in most alloys. This is collectively referred as the formation of a substructure. There is extensive qualitative information about substructures in the literature, but quantitative modeling has only appeared recently. In this paper, basic models for the formation of substructure during creep and deformation at constant strain rate are presented. It is demonstrated that the models can give at least an approximate description of available experimental data. The presence of substructure can have a dramatic impact on properties. It is well-known that prior cold work can significantly increase the creep strength. Cold work of copper can raise the creep rupture time by up to six orders of magnitude. During plastic deformation dislocations with opposite Burgers vectors move in different directions creating polarized or unbalanced dislocations. Since the unbalanced dislocations are not exposed to static recovery, they form a stable dislocation structure. Taking the role of the unbalanced dislocations into account, the full increase of the creep strength after cold work can quantitatively be explained (without the use of adjustable parameters). Additionally, the shape of the creep curves that varies with the amount of cold work can be modeled. The substructure is also of importance for the modeling of creep curves for material without cold work. In power-law breakdown, the stress exponent can be 50 or more. This should imply that there would be a huge increase in the creep rate with increasing strain, but that is not observed. The reason is that the unbalanced dislocations form a back stress that acts against the increase in the true stress. Taking the back stress into account, it has been possible to model creep curves for copper at near ambient temperatures. This effect must be taken into account in stress analysis to avoid overestimating the creep rate by many orders of magnitude. Full article
(This article belongs to the Special Issue New Horizons in High-Temperature Deformation of Metals and Alloys)
►▼ Show Figures

Figure 1

Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:
 
Displaying articles 1-4
Back to TopTop