Strength and Toughness Mechanism of Metal Materials in Extreme Environments

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Metal Failure Analysis".

Deadline for manuscript submissions: closed (30 September 2023) | Viewed by 2268

Special Issue Editor


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Guest Editor
Shanxi Key Laboratory of Material Strength and Structural Impact, Taiyuan University of Technology, Taiyuan 030024, China
Interests: metals and alloys; strengthening and toughening; deformation mechansims; extreme environments; microstructure and property

Special Issue Information

Dear Colleagues,

With increasing application requierments with respect to temperature, pressure, velocity, corrosion, and radiation, there is an urgent and important need to investigate the damage tolerance of metals and alloys subjected to various extreme environments in the materials science and engineering community. Specifically, the strengthening and toughening of metal materials upon extreme environments, i.e., unveiling the underlying deformation mechanisms, could potentially accelerate the design and development of advanced materials that can be applicable in aeroengine turbine blades, armor protections, polar icebreaking, radiation damage resistance, ocean freighters, etc. Among successful examples, high-entropy alloys or multicomponents alloys have been quickly growing academic hotspots since 2004, which shows that they have great potential as future candidates in extreme condition applications. In a word, for this Special Issue in Metals, we welcome reviews and articles in the areas of principles, theoretical calculation, material preparation and characterization, and applications of metal materials in extreme environments.

Dr. Shengguo Ma
Guest Editor

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Keywords

  • metals and alloys
  • strengthening and toughening
  • deformation mechansims
  • extreme environments
  • microstructure and property

Published Papers (1 paper)

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Research

11 pages, 2505 KiB  
Article
Influence of the Machining Process on the Service Life and Pitting Morphology of Gear-Tooth Surfaces
by Wenbo Xu, Hongtao Huang, Yang Gao, Xiaofeng Qin, Taolue Wen, Shufeng Yang, Peng Zhang, Liang Wang and Ce Guo
Metals 2022, 12(8), 1382; https://doi.org/10.3390/met12081382 - 20 Aug 2022
Viewed by 1471
Abstract
Pitting, which results from contact fatigue, is a common failure mode in gear transmission systems and is influenced by the material strength and stress state of the contact area, which is further influenced by lubrication and roughness because of stress fluctuations. In this [...] Read more.
Pitting, which results from contact fatigue, is a common failure mode in gear transmission systems and is influenced by the material strength and stress state of the contact area, which is further influenced by lubrication and roughness because of stress fluctuations. In this study, a comparative contact-fatigue test was conducted on two types of gears with different terminal machining processes. The contact stress of the tooth surface considering the microtopography was analyzed using the fractal method based on surface microtopography data measured from the surface formed by the two processes. Test results show that the average service life of gears machined using the barrel-finishing process was approximately 5–7 times that of gears machined using grinding. The pitting morphologies of gears fabricated using different processes exhibited evident differences. The maximum stress level of the gears machined with barrel finishing was approximately twice that of the gears machined through grinding. Different stress levels resulted in different micropitting load-bearing capacities, which could be attributed to the different service lives of gears manufactured through different machining processes. The different presence features of the pitting morphology were due to the different micromorphologies of the surface formed by the different finishing processes. In particular, the randomly distributed pitting morphology of the gear surface machined using the barrel-finishing process was due to its flattening and polishing effect. Optimization of the surface-microgeometry distribution via the finishing process is an effective method for prolonging the service life of gears. Full article
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