Special Issue "Fatigue of Intermetallics"

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

Deadline for manuscript submissions: 30 April 2018

Special Issue Editor

Guest Editor
Prof. Dr. Gilbert Hénaff

ISAE ENSMA, PPRIME Inst, Futuroscope, France
Website | E-Mail
Interests: structural intermetallics; crack initiation; fatigue crack propagation; cyclic deformation; fatigue design; failure analysis

Special Issue Information

Dear Colleagues,

Intermetallic compounds, typically titanium aluminides, are now actual structural materials in the automotive and aerospace industries. The control of the fatigue strength of these materials is, therefore, a major challenge in order to ensure the integrity of components. This aim of this Special Issue is to present a review of the latest advances in the various aspects of fatigue of intermetallics. We invite contributions on topics that include, but are not limited to:

  • Cyclic deformation mechanisms in relation with microstructure;
  • Crack initiation;
  • Crack propagation;
  • Environmental effects on fatigue resistance;
  • Creep-fatigue
  • Thermo-mechanical fatigue;
  • Influence of processing (casting, forging, powder metallurgy, additive manufacturing, etc.) on fatigue strength;
  • Specific fatigue design methods and life prognosis.

Prof. Dr. Gilbert Hénaff
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

  • dislocation
  • damage
  • microstructure
  • fatigue life
  • environmental effects
  • failure
  • elevated temperatures

Published Papers (2 papers)

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Research

Open AccessArticle High-Temperature Creep-Fatigue Behavior of Alloy 617
Metals 2018, 8(2), 103; doi:10.3390/met8020103
Received: 27 November 2017 / Revised: 12 January 2018 / Accepted: 25 January 2018 / Published: 1 February 2018
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Abstract
This paper presents the high-temperature creep-fatigue testing of a Ni-based superalloy of Alloy 617 base metal and weldments at 900 °C. Creep-fatigue tests were conducted with fully reversed axial strain control at a total strain range of 0.6%, 1.2%, and 1.5%, and peak
[...] Read more.
This paper presents the high-temperature creep-fatigue testing of a Ni-based superalloy of Alloy 617 base metal and weldments at 900 °C. Creep-fatigue tests were conducted with fully reversed axial strain control at a total strain range of 0.6%, 1.2%, and 1.5%, and peak tensile hold time of 60, 180, and 300 s. The effects of different constituents on the combined creep-fatigue endurance such as hold time, strain range, and stress relaxation behavior are discussed. Under all creep-fatigue tests, weldments’ creep-fatigue life was less than base metal. In comparison with the low-cycle fatigue condition, the introduction of hold time decreased the cycle number of both base metal and weldments. Creep-fatigue lifetime in the base metal was continually decreased by increasing the tension hold time, except for weldments under longer hold time (>180 s). In all creep-fatigue tests, intergranular brittle cracks near the crack tip and thick oxide scales at the surface were formed, which were linked to the mixed-mode creep and fatigue cracks. Creep-fatigue interaction in the damage-diagram (D-Diagram) (i.e., linear damage summation) was evaluated from the experimental results. The linear damage summation was found to be suitable for the current limited test conditions, and one can enclose all the data points within the proposed scatter band. Full article
(This article belongs to the Special Issue Fatigue of Intermetallics)
Figures

Open AccessArticle Analysis of Fatigue and Wear Behaviour in Ultrafine Grained Connecting Rods
Metals 2017, 7(8), 289; doi:10.3390/met7080289
Received: 3 July 2017 / Revised: 19 July 2017 / Accepted: 20 July 2017 / Published: 29 July 2017
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Abstract
Over the last few years there has been an increasing interest in the study and development of processes that make it possible to obtain ultra-fine grained materials. Although there exists a large number of published works related to the improvement of the mechanical
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Over the last few years there has been an increasing interest in the study and development of processes that make it possible to obtain ultra-fine grained materials. Although there exists a large number of published works related to the improvement of the mechanical properties in these materials, there are only a few studies that analyse their in-service behaviour (fatigue and wear). In order to bridge the gap, in this present work, the fatigue and wear results obtained for connecting rods manufactured by using two different aluminium alloys (AA5754 and AA5083) previously deformed by severe plastic deformation (SPD), using Equal Channel Angular Pressing (ECAP), in order to obtain the ultrafine grain size in the processed materials are shown. For both aluminium alloys, two initial states were studied: annealed and ECAPed. The connecting rods were manufactured from the previously processed materials by using isothermal forging. Fatigue and wear experiments were carried out in order to characterize the in-service behaviour of the components. A comparative study of the results was made for both initial states of the materials. Furthermore, Finite Element Modelling (FEM) simulations were used in order to compare experimental results with those obtained from simulations. In addition, dimensional wear coefficients were found for each of the aluminium alloys and initial deformation states. This research work aims to progress the knowledge of the behaviour of components manufactured from ultrafine grain materials. Full article
(This article belongs to the Special Issue Fatigue of Intermetallics)
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