State-of-the-Art of Inclusion/Precipitate Engineering in Steels

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

Deadline for manuscript submissions: 30 December 2025 | Viewed by 552

Special Issue Editor

Special Issue Information

Dear Colleagues,

Non-metallic inclusion and precipitate behaviors in liquid- and solid-state steels and alloys have a significant influence on both the cleanliness and the mechanical and corrosion properties of the materials. Two classical terminologies regarding the control of non-metallic inclusion behaviors exist: “Clean Steel Technology” refers to the investigation of inclusion motion, agglomeration, and its removal from the liquid steel and slag. When the inclusion size is too small (normally sub-micron size) to remove, “Oxide Metallurgy” provides a suitable solution to utilize these types of specific inclusions/precipitates to refine the prior austenite grain size (PAGS) and induce intragranular acicular ferrite (IAF) formation to improve the steel mechanical property, e.g., low-temperature toughness. Recently, with the development of simulation and characterization methodologies, the boundary of these two concepts starts to overlap, and it is better to use one concept, i.e., “Inclusion/Precipitate Engineering”, to describe the correlation of processing, structure, and property regarding the particle behaviors in advanced steels and other metallic materials, e.g., high-entropy alloys (HEAs). Besides the behaviors of inclusions in the steelmaking and casting process, the control of inclusions in state-of-the-art processes, e.g., additive manufacturing (AM), is also included in this concept. Finally, machine learning (ML)-based methods, as well as automatic analysis, start to be applied in this field extensively to classify different inclusion types and analyze the statistical features rapidly.

This Special Issue (SI) aims to collate state-of-the-art work focusing on the ’inclusion/precipitate engineering in steels’; both advanced experimental characterization and multiscale simulation research are welcome. This collection aims to contribute to moving ultra-clean steel production towards a more sustainable future.

Dr. Wangzhong Mu
Guest Editor

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Published Papers (1 paper)

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Research

17 pages, 18661 KB  
Article
Effect of Yttrium Treatment on Inclusions and Microstructure of High-Strength Peritectic Steel
by Min Liu, Chaobin Lai, Xiaogang Yang, Kexin Li, Zhi Zhang, Yasheng Chen and Weirong Li
Metals 2025, 15(12), 1284; https://doi.org/10.3390/met15121284 - 24 Nov 2025
Viewed by 337
Abstract
The morphology and types of inclusion, as well as the microstructure, fundamentally affect the properties of high-strength peritectic steel. Rare earth elements not only modify inclusions but also act on the transformation of the microstructure. In this paper, the evolution mechanism of yttrium [...] Read more.
The morphology and types of inclusion, as well as the microstructure, fundamentally affect the properties of high-strength peritectic steel. Rare earth elements not only modify inclusions but also act on the transformation of the microstructure. In this paper, the evolution mechanism of yttrium for the inclusions and microstructure in high-strength peritectic steel was investigated through experimental testing and thermodynamic analysis. The results show that yttrium treatment can modify the main large-sized irregular inclusions into spherical or near-spherical rare earth inclusions, accompanied by a reduction in the number density, area fraction, average diameter, and aspect ratio of inclusions. The evolution route for the inclusions follows Al2O3 + MnS + Al2O3-MnS→Y2O3 + Y-O-S + Y-S + Y-O-S-MnS with yttrium addition. The microstructural characteristics of yttrium-free steel show significant differences from those of yttrium-containing steel. Compared to yttrium-free steel, the yttrium-0.015 wt.% steel shows a refined austenite structure with more uniform size distribution and the absence of grain boundary ferrite films. The Y2O3 and Y2O2S inclusions mainly formed in liquid steel were found along the austenite grain boundary to prevent the grain growth and the formation of ferrite films. Additionally, after adding rare earth yttrium, the fraction of high-angle grain boundaries (HAGBs) increases, together with a decrease in the fraction of low-angle grain boundaries (LAGBs) in steel. The research results can provide a theoretical basis for the application of adding rare earth yttrium to high-strength peritectic steel. Full article
(This article belongs to the Special Issue State-of-the-Art of Inclusion/Precipitate Engineering in Steels)
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