Structure and Properties of Heterogeneous Materials

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Structural Integrity of Metals".

Deadline for manuscript submissions: closed (31 August 2022) | Viewed by 2940

Special Issue Editor


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Guest Editor
Collaborative Innovation Center of Steel Technology, University of Science & Technology Beijing, Beijing 100083, China
Interests: strengthening mechanism; microstructure evolution; deformation mechanism; heat treatment; high strength and ductility; corrosion behavior; wear resistance; bimodal grain size distribution

Special Issue Information

Dear Colleagues,

Heterogeneous materials (heterogeneous zones with intense variations in mechanical/physical properties) are a new class of materials with excellent mechanical and physical properties that cannot be achieved by traditional homogeneous materials. In recent years, they have been widely studied and reported by researchers all over the world. Synergetic strengthening, long-range internal stress (back stress), controlling the distribution of defects, and the interaction between different zones are hot spots in the study of heterogeneous materials, and are also key to achieving excellent mechanical and physical properties. Compared with nanomaterials, which have been extensively studied in the past thirty years, heterogeneous materials can be processed using existing industrial equipment, making them conducive to low-cost industrial production.

Currently, the most studied heterogeneous materials are structural heterogeneous metal materials, including heterogeneous lamella structures, gradient structures, multi-modal structures, and dual/multi-phase structures. Research and development involving these heterogeneous materials are always welcome. Of course, heterogeneous materials still have many problems to be studied and solved urgently. These outstanding issues include exploring the interaction between geometrically necessary dislocations (GNDs) and regional boundaries, studying the formation mechanism of shear band and its relationship with GND accumulation, and developing processing technologies that can precisely control heterogeneous structures and have low processing costs. Research articles focusing on above topics are encouraged as well.

Prof. Dr. Hui-Bin Wu
Guest Editor

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Keywords

  • heterogeneous materials
  • synergetic effect
  • interaction effect
  • hetero-deformation
  • geometrically necessary dislocations
  • multiple strengthening
  • mechanical properties
  • strength–ductility synergy

Published Papers (1 paper)

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Research

12 pages, 6896 KiB  
Article
Effect of Quenching and Tempering on Mechanical Properties and Impact Fracture Behavior of Low-Carbon Low-Alloy Steel
by Yajing Zhang, Jianhua Yang, Daheng Xiao, Deng Luo, Chende Tuo and Huibin Wu
Metals 2022, 12(7), 1087; https://doi.org/10.3390/met12071087 - 25 Jun 2022
Cited by 7 | Viewed by 2630
Abstract
Conventional quenching and tempering were employed to achieve the optimal strength and toughness of low-carbon low-alloy steel. The fracture behavior (crack initiation and propagation) of the steel in the impact process was also analyzed. It was found that the microstructures of the steel [...] Read more.
Conventional quenching and tempering were employed to achieve the optimal strength and toughness of low-carbon low-alloy steel. The fracture behavior (crack initiation and propagation) of the steel in the impact process was also analyzed. It was found that the microstructures of the steel after different tempering treatments were mainly composed of martensite, and its mechanical properties were dependent on the tempering temperature. With the increase in tempering temperature, martensitic laths merged and coarsened. Moreover, recovery occurred, causing a decrease in dislocation density. Subsequently, the strength of the steel gradually decreased, and the impact energy increased. When the tempering temperature was 600 °C, the optimal yield strength (557 MPa) and the impact energy (331 J) were achieved. In addition, high angle grain boundaries (HAGBs) affected the impact energy and crack propagation. Cracks were easily deflected when they encountered high angle grain boundaries, and linearly expanded when they encountered low angle grain boundaries (LAGBs). Full article
(This article belongs to the Special Issue Structure and Properties of Heterogeneous Materials)
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