Inclusions in Steels and Alloys

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

Deadline for manuscript submissions: closed (31 May 2023) | Viewed by 1490

Special Issue Editors

State Key Lab of Advanced Metallurgy, Institute of Research of Iron & Steel, University of Science & Technology Beijing, Beijing 100083, China
Interests: steel cleanliness; inclusions control; continuous casting
School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan 114051, China
Interests: clean steel and inclusions control; solidification and continuous casting of steel; simulation of metallurgical processes

Special Issue Information

Dear Colleagues,

Inclusions have adverse effects on the continuity of the matrix and the properties of steels and alloys; for example, they may reduce plasticity, toughness and fatigue properties, in addition to deteriorating the cold and hot processabilities and even some of the physical properties of steel. The miniaturization, dispersion and harmlessness of non-metallic inclusions in steel and alloys have always been the direction of metallurgical scholars’ research and exploration in high-purity steel. The size, quantity, type, morphology and distribution of inclusions in the matrix have impacts on the properties and final service life of steels and alloys. Therefore, the realization of the high quality and cleanliness of the variety steel is closely related to the metallurgical engineering of the inclusions. The metallurgical engineering of inclusions is a systematic engineering that runs through the whole process of "smelting–casting–rolling–processing–forming–service". It is an important tool to link the quality inheritance of process interface, mainly to solve the inheritance law of the effect of inclusions in steel on the quality and properties between cross-process, cross-interface and cross-scale.

This Special Issue aims to provide a platform for academic exchange to explore new methods and technologies for three-dimensional characterization, quantitative analysis, and phasing characterization of non-metallic inclusions in steel; understand the formation, growth, floating removal, slag adsorption and shell capture of inclusions in molten steel in a metallurgical reactor; analyze the source and evolution of non-metallic inclusions in steel, the relationship between them and the properties of the final products; understand the inheritance relationship and genetic law between inclusions in alloys and the cleanliness of steels; and to show more new achievements and discoveries related to inclusions.

Prof. Dr. Min Wang
Prof. Dr. Xingang Ai
Guest Editors

Manuscript Submission Information

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Keywords

  • inclusions in alloys
  • inclusions in steels
  • inclusions inheritance
  • characterization techniques
  • inclusions and steel properties

Published Papers (1 paper)

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Research

15 pages, 10556 KiB  
Article
Formation and Modification of Al2O3 and MnS Inclusions in Al-Killed Gear Steels via Ca Treatment
by Haseeb Ahmad, Fengqiu Tang, Zan Yao, Yingtie Xu, Zongze Huang, Baojun Zhao and Xiaodong Ma
Metals 2023, 13(7), 1153; https://doi.org/10.3390/met13071153 - 21 Jun 2023
Viewed by 1028
Abstract
A laboratory study was carried out to better understand the factors that contribute to the formation of complex inclusions, as inclusions play an important role during steel production; if not properly managed, inclusions can cause nozzle clogging during continuous casting and also damage [...] Read more.
A laboratory study was carried out to better understand the factors that contribute to the formation of complex inclusions, as inclusions play an important role during steel production; if not properly managed, inclusions can cause nozzle clogging during continuous casting and also damage the steel’s mechanical properties and machineability. To determine the chemical composition of inclusions that are less detrimental to the machineability of Al-deoxidized and Ca-treated gear steels, thermodynamic calculations and automated scanning electron microscopy (SEM) coupled with energy dispersive spectroscopy (EDS), as well as electron probe micro-X-ray analysis (EPMA) with the wavelength dispersive spectroscopy (WDS) technique, were utilized. The findings demonstrated that the morphology of inclusions changed from irregular to a more spherical type and the composition also changed to dual oxy-sulfides from pure oxides and sulfides as the Ca concentration in the steel was increased up to 36 ppm. The amount of Pure MnS sulfides also reduced significantly after Ca treatment. The ternary phase diagram and stability diagram for the inclusions revealed that 15–25 ppm Ca is the optimal range for the modification of both oxides and sulfides into the desired morphology and composition under the stipulation that the concentration of O in the steel is maintained at or below 50 ppm. Full article
(This article belongs to the Special Issue Inclusions in Steels and Alloys)
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