Evolution of sulphide inclusion in Mg–Ca treating gear steel

IF 1.7 3区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Ironmaking & Steelmaking Pub Date : 2022-11-06 DOI:10.1080/03019233.2022.2139286
You Xie, Xiaoling Meng, Xiangyang Deng, Shichao Li
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Abstract

ABSTRACT The behaviour of sulphide inclusion in Ti-S-containing gear steel is studied, when Mg–Ca treatment is applied to control the sulphide shape. The results show that MgO + CaS will appear in molten steel after Mg–Ca treatment is carried out and act as the heterogeneous nucleus of TiN and MnS during subsequent solidification process. CaS in molten steel has the tendency to transform into (Ca,Mn)S with the development of solidification. The transformation degree is influenced by cooling rate and even stopped when CaS is totally covered by a TiN shell, resulting in the formation of three types of sulphides with evidently different chemical compositional characteristics in casted billet. Based on the study in the paper, the improvement of sulphide morphology under heterogeneous nucleation effect by oxide core and modification effect by calcium will be prevented by the titanium nitride which precipitates first in Ti-containing gear steel.
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镁钙处理齿轮钢中硫化物夹杂物的演变
摘要研究了采用Mg–Ca处理控制硫化物形状时,含Ti齿轮钢中硫化物夹杂物的行为。结果表明,MgO + Mg–Ca处理后,CaS会出现在钢液中,并在随后的凝固过程中充当TiN和MnS的非均匀核。随着凝固过程的发展,钢水中的CaS有向(Ca,Mn)S转变的趋势。当CaS完全被TiN壳层覆盖时,转变程度受到冷却速度的影响,甚至停止,导致铸坯中形成三种化学成分特征明显不同的硫化物。基于本文的研究,在含钛齿轮钢中首先析出的氮化钛将阻止在氧化物核的非均匀成核作用和钙的改性作用下硫化物形态的改善。
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来源期刊
Ironmaking & Steelmaking
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.
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