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Crystals
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Microstructure and Crystallographic Texture Control of Metallic Materials through Advanced...
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Microstructure and Crystallographic Texture Control of Metallic Materials through Advanced Processing

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Crystalline Metals and Alloys".

Deadline for manuscript submissions: closed (31 August 2021) | Viewed by 3985

Special Issue Editor

Dr. Sumit Ghosh

E-Mail Website1 Website2
Guest Editor
Materials and Mechanical Engineering, Centre of Advanced Steels Research, University of Oulu, 90014 Oulu, Finland
Interests: additive manufacturing; surface engineering; structural characterization; thermomechanical simulation; structure–property correlation
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Demand of improvement of the existing strength of the metallic materials is increased day by day to enhance the performance of the structural components (i.e. load-bearing). Strengthening of the steels without losing their ductility is the key thrust of the research to meet the present challenges. Microstructure and texture are two main key factors which influence the mechanical properties significantly. Optimisation of microstructure/texture through advanced processing techniques is essential to achieve better combination of mechanical properties. This is even more important nowadays as the global warming and metal scarcity are major concerns. Development of high strength/tough alloys with high strength to weight ratio is an effective way to address these issues. Hence, main focus of this Special Issue is to provide more detail insights about new advance technological processing development/approaches which lead to improved mechanical properties and relate to texture and anisotropy.

I believe that this issue will also help the metals research community to formulate new challenging directions in this exciting field of science and technology.

Dr. Sumit Ghosh
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 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. Crystals 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 2100 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

  • Alloy design
  • Thermomechanical processing/Plastic deformation
  • Additive manufacturing
  • Microstructure
  • Crystal orientation/Texture
  • Mechanical properties

Published Papers (2 papers)

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Research

11 pages, 6507 KiB  
Article
Effect of Hot Working Processes on Microstructure and Mechanical Properties of Pipeline Steel
by Huiling Ji, Yiwei Zhang, Wenzhao Lu, Bang Wei and Xiaomin Yuan
Crystals 2021, 11(8), 860; https://doi.org/10.3390/cryst11080860 - 24 Jul 2021
Viewed by 1818
Abstract
The microstructure and microhardness of X70 pipeline steel were investigated after conducting different processing routes. The microstructure was characterized using optical and electron microscopy. Scanning electron microscopy equipped with electron backscattered diffraction (EBSD) and transmission electron microscopy techniques were applied for investigation of [...] Read more.
The microstructure and microhardness of X70 pipeline steel were investigated after conducting different processing routes. The microstructure was characterized using optical and electron microscopy. Scanning electron microscopy equipped with electron backscattered diffraction (EBSD) and transmission electron microscopy techniques were applied for investigation of different thermal processing treatment conditions. Mechanical properties were characterized by a microhardness tester. The results show that the microstructure mainly consists of granular bainite, acicular ferrite and a small amount of M/A constituents under hot rolling states. There are many dislocations inside the acicular ferrite. The thermal simulation experiments show that the microstructure becomes homogeneous with the increase in cooling rate. The acicular ferrite morphology becomes fine and uniform, and the content of M/A constituents increases at the same compression amount. The compression gives rise to the accumulated strain and stored energy, which accelerate the transformation of acicular ferrite and refine the microstructure of the pipeline steel. The microhardness rises with the increase in deformation ratio and cooling rate. The microstructure of the pipeline steel subjected to the isothermal quenching process is ultrafine ferrite and M/A islands. When the isothermal quenching temperature reaches 550 °C, a small amount of upper bainite appears in the microstructure. With the increase in isothermal quenching temperature, the microhardness decreases. Acicular ferrite is a better candidate microstructure than ultrafine ferrite for the pipeline steels. Full article
(This article belongs to the Special Issue Microstructure and Crystallographic Texture Control of Metallic Materials through Advanced Processing)
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9 pages, 3540 KiB  
Article
Helium Effects on the Mechanical Properties of Nanocrystalline Fe: Based on Molecular Dynamics
by Chunping Xu and Dongyan Yang
Crystals 2021, 11(5), 532; https://doi.org/10.3390/cryst11050532 - 11 May 2021
Cited by 1 | Viewed by 1713
Abstract
A molecular dynamics (MD) simulation study was performed to investigate the effects of helium (He) on the mechanical properties of nanocrystalline body-centered cubic iron (BCC Fe). Simulated X-ray diffraction (XRD) was used to explore the relationship between the generation of cracks and the [...] Read more.
A molecular dynamics (MD) simulation study was performed to investigate the effects of helium (He) on the mechanical properties of nanocrystalline body-centered cubic iron (BCC Fe). Simulated X-ray diffraction (XRD) was used to explore the relationship between the generation of cracks and the change of the crystal structure in nanocrystalline BCC Fe during tensile deformation. It is observed that the peak stress and the elastic modulus decrease with increasing concentration of He atoms, which are introduced into the grain boundary (GB) region of nanocrystalline Fe. The generation and connection of intergranular cracks are enhanced by He atoms. Significant peak separation, which is associated with the generation of cracks, is found in the simulated XRD patterns of nanocrystalline Fe during the tensile process. The lower diffraction angle of the {211}′ peak suggests a more serious lattice distortion during loading. For all nanocrystalline Fe deformed to 6% strain, the degree and fraction of the lattice distortion increases with the increasing loading stress. Full article
(This article belongs to the Special Issue Microstructure and Crystallographic Texture Control of Metallic Materials through Advanced Processing)
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