Special Issue "Fracture Behaviour of Innovative Materials under Different Enviromental Conditions"

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

Deadline for manuscript submissions: 30 November 2017

Special Issue Editor

Guest Editor
Prof. Filippo Berto

Department of Mechanical and Industrial Engineering, Faculty of Engineering, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway
Website | E-Mail
Interests: fatigue of advanced and traditional materials; surface roughness; tribology; fracture mechanics; solid mechanics

Special Issue Information

Dear Colleagues,

The interest in fracture assessment of steel and other alloys at high temperature and under aggressive environments has increased continuously in the last few years. However, fracture of components under these conditions has not been deeply investigated, experimentally nor theoretically.

The applications in which the fracture phenomenon is affected by high temperature and aggressive corrosive environments are of considerable interest and involve different industrial sectors, such as transportation, energy, and metal-manufacturing (e.g., jet engine components, nuclear power plant, pressure vessel, hot rolling of metal). To provide as optimum a performance as possible in these high demanding conditions, it is necessary to be aware of the application and of proper tools to perform the fracture and fatigue assessment under these conditions.

The present Special Issue aims at filling that gap.

Prof. Dr. Filippo Berto
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 1000 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

  • High temperature
  • Fracture
  • Corrosion fracture and fatigue
  • Aggressive environment
  • Corrosion

Published Papers (2 papers)

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Research

Open AccessArticle Effect of Ultrasonic Surface Impact on the Fatigue Behavior of Ti-6Al-4V Subject to Simulated Body Fluid
Metals 2017, 7(10), 440; doi:10.3390/met7100440
Received: 26 September 2017 / Revised: 7 October 2017 / Accepted: 11 October 2017 / Published: 18 October 2017
PDF Full-text (1377 KB)
Abstract
The effect of ultrasonic nanocrystal surface modification (UNSM) on the fatigue behavior of Ti6Al4V (TC4) in simulated body fluid (SBF) was investigated. UNSM with the condition of a static load of 25 N, vibration amplitude of 30 μm and 36,000 strikes per unit
[...] Read more.
The effect of ultrasonic nanocrystal surface modification (UNSM) on the fatigue behavior of Ti6Al4V (TC4) in simulated body fluid (SBF) was investigated. UNSM with the condition of a static load of 25 N, vibration amplitude of 30 μm and 36,000 strikes per unit produced about 35 μm surface severe plastic deformation (SPD) layers on the TC4 specimens. One group was treated with a hybrid surface treatment (UNSM + TiN film). UNSM technique improves the micro hardness and the compressive residual stress. The surface roughness is increased slightly, but it can be remarkably improved by the TiN film. The fatigue strength of TC4 is improved by about 7.9% after UNSM. Though the current density of corrosion is increased and the pitting corrosion is accelerated, UNSM still improved the fatigue strength of TC4 after pre-soaking in SBF by 10.8%. Interior cracks initiate at the deformed carbide and oxide inclusions due to the ultrasonic impacts of UNSM. Corrosion products are always observed at the edge of fracture surface to both interior cracks and surface cracks. Coating a TiN film on the UNSMed surface helps to improve the whole properties of TC4 further. Full article
Open AccessArticle Behavior of the Steel T91 under Multi Axial Loading in Contact with Liquid and Solid Pb
Metals 2017, 7(9), 342; doi:10.3390/met7090342
Received: 2 August 2017 / Revised: 21 August 2017 / Accepted: 22 August 2017 / Published: 4 September 2017
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Abstract
In this work, the conditions for the occurrence of Liquid Metal Embrittlement (LME) in the ferritic-martensitic steel T91 in contact with lead, Pb, were examined. Slow tensile tests with notched specimens revealed that in a temperature range close to the melting point of
[...] Read more.
In this work, the conditions for the occurrence of Liquid Metal Embrittlement (LME) in the ferritic-martensitic steel T91 in contact with lead, Pb, were examined. Slow tensile tests with notched specimens revealed that in a temperature range close to the melting point of Pb, the steel is sensitive to LME (350–400 °C) and to Solid Metal Induced Embrittlement (SMIE) (300 °C). The cracking was stimulated by wetting (using a chemical flux) and the notch effect. It was found that the multi axial stresses state and the high level of plastic strain in front of the notch were the key factors triggering crack initiation. Full article
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