Revealing the morphology evolution and distribution of manganese sulphide in the 38MnS6 steel during continuous casting

IF 1.7 3区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Ironmaking & Steelmaking Pub Date : 2023-01-22 DOI:10.1080/03019233.2023.2164953

Cheng Yao, Min Wang, Xiao-yu Xie, Chao Gu, Lidong Xing, X. Ai, Y. Bao

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引用次数: 1

Abstract

ABSTRACT In this paper, the characteristics of manganese sulphide in the continuous casting bloom of 38MnS6 steel were revealed. Manganese sulphide in low oxygen (w(O) = 7 ppm) bloom mainly exists in the form of pure manganese sulphide distributed along grain boundaries. The morphology changes from fine droplets/rods to dendrites with large size and the aspect ratio gradually increases. The thermodynamic calculation results show that manganese sulphide precipitates at the end of solidification (f s = 0.86), and its morphology is related to local supersaturation and extrusion of solid-phase boundary. The solid-phase first transforms from high-temperature ferrite to austenite, then austenite grows up, which compresses the liquid phase boundary enriched with Mn and S and finally forms a large amount of manganese sulphide at the grain boundary. Dendritic, angular and droplet/rod manganese sulphide have different growth processes. Different types of morphological growth processes of manganese sulphide are described by combining crystal growth mechanism and solidification process.

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揭示了38MnS6钢连铸过程中硫化锰的形态演变及分布规律

本文揭示了38MnS6钢连铸大方坯中硫化锰的特性。低氧中的硫化锰（w（O） = 7. ppm）水华主要以沿晶界分布的纯硫化锰的形式存在。其形貌由细小的液滴/棒状转变为大尺寸的枝晶，长径比逐渐增大。热力学计算结果表明，硫化锰在凝固末期析出（fs = 0.86），其形态与固相边界的局部过饱和和挤出有关。固相首先从高温铁素体转变为奥氏体，然后奥氏体长大，压缩了富含Mn和S的液相边界，最终在晶界形成大量的硫化锰。树枝状、棱角状和液滴/棒状硫化锰具有不同的生长过程。结合晶体生长机理和凝固过程，描述了硫化锰的不同形态生长过程。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ironmaking & Steelmaking 工程技术-冶金工程

CiteScore

3.70

自引率

9.50%

发文量

125

审稿时长

2.9 months

期刊介绍： Ironmaking & Steelmaking: Processes, Products and Applications monitors international technological advances in the industry with a strong element of engineering and product related material. First class refereed papers from the international iron and steel community cover all stages of the process, from ironmaking and its attendant technologies, through casting and steelmaking, to rolling, forming and delivery of the product, including monitoring, quality assurance and environmental issues. The journal also carries research profiles, features on technological and industry developments and expert reviews on major conferences.