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Dear Colleagues,

After our successful first two volume of the Special Issue “Mechanical Behavior of Composite Materials”, we have decided to create the 3rd volume, in order to collect and publish a series of state-of-art research in mechanical behaviors of composites materials.

The appearance of composite materials was a revolution in the field of materials due to their high mechanical properties and lightness. This opened up important expectations for their use in technological components that required stronger and lighter materials. When we talk about mechanical properties, we also talk about fatigue, fracture and creep, and even the strength of adhesive joints, if one of the adhesives is a composite. Another point of recent importance is the additive manufacturing of composites and the modifications that this new configuration of materials brings to the usual study of mechanical properties. In short, this special issue contains all the contributions that allow us to disseminate a better understanding of this exciting family of materials from the point of view of their mechanical properties.

Prof. Dr. Jaime Viña
Guest Editor

Manuscript Submission Information

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 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.

Related Special Issues

Published Papers (1 paper)

Research

13 pages, 4575 KiB

Open AccessArticle

Effect of Rare Earth Elements on Microstructure and Tensile Behavior of Nb-Containing Microalloyed Steels

by Shi Cheng, Tingping Hou, Yihang Zheng, Chaochao Yin and Kaiming Wu

Materials 2024, 17(7), 1701; https://doi.org/10.3390/ma17071701 - 8 Apr 2024

Viewed by 505

Abstract

The present investigation endeavors to explore the influence of rare earth elements on the strength and plasticity characteristics of low-carbon microalloyed steel under tensile loading conditions. The findings from the conducted tensile tests indicate that the incorporation of rare earths leads to a notable enhancement in the yield strength, ultimate tensile strength, and ductility properties of the steel. A comparative analysis of the microstructures reveals that the presence of rare earths significantly refines and optimizes the microstructure of the microalloyed steel. This optimization is manifested through a reduction in grain size, diminution of inclusion sizes, and a concomitant rise in their number density. Moreover, the addition of rare earths is observed to foster an increase in the volumetric fraction of carbides within the steel matrix. These multifaceted microstructural alterations collectively contribute to a substantial strengthening of the microalloyed steel. Furthermore, it is elucidated that the synergistic interaction between rare earth elements and both carbon (C) and niobium (Nb) in the steel matrix augments the extent of the Lüders strain region during the tensile deformation of specimens. This phenomenon is accompanied by the effective modification of inclusions by the rare earths, which serves to mitigate stress concentrations at the interfaces between the inclusions and the surrounding matrix. This article systematically evaluates the modification mechanism of rare earth microalloying, which provides a basis for broadening the application of rare earth microalloying in microalloyed steel. Full article

(This article belongs to the Special Issue Mechanical Behavior of Composite Materials (3rd Edition))

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