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高碳钢中硫化锰析出的原位表征

In situ characterisation of MnS precipitation in high carbon steel.

作者信息

Tanaka Yasuhiro, Pahlevani Farshid, Moon Suk-Chun, Dippenaar Rian, Sahajwalla Veena

机构信息

Centre for Sustainable Materials Research and Technology (SMaRT), School of Materials Science and Engineering, UNSW Sydney, Kensington, New South Wales, 2052, Australia.

Steelmaking Division, Yawata works, Nippon Steel Corporation, 1-1 Tobihatacho, Tobata-ku, Kitakyushu, Fukuoka, 804-8501, Japan.

出版信息

Sci Rep. 2019 Jul 12;9(1):10096. doi: 10.1038/s41598-019-46450-y.

DOI:10.1038/s41598-019-46450-y
PMID:31300683
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6626000/
Abstract

Manganese sulphide (MnS) is one of the major non-metallic inclusions in steel with huge impact on steel property. In the case of high carbon steel, due to higher sulphur content and its brittleness, controlling MnS formation is one of the main issues. MnS has a complicated precipitation mechanism during solidification in liquid and solid steel and at the interface with oxide inclusions. Higher sulphur content, lower melting point and different oxide inclusions in high carbon steel will cause MnS precipitation at different stages. In this study, different stages of MnS precipitation from liquid and/or solid in high carbon steel and at the interface with oxide inclusion were investigated comprehensively via two different types of High Temperature Confocal Scanning Laser Microscope (HTCSLM). Samples were analysed further using SEM-EDS for better understanding the pertaining mechanisms. MnS precipitation on the surface of liquid steel was observed in situ in a HTCSLM by the use of a concentric solidification technique. Additionally, formation of MnS following solidification and at the interfaces of oxide inclusions, was investigated in situ in a HTCSLM, which has a uniform temperature profile across the specimen. These comprehensive descriptions about different stages of MnS precipitation in high carbon steel have been conducted for the first time and provide crucial information for controlling MnS morphology in high carbon steel.

摘要

硫化锰（MnS）是钢中主要的非金属夹杂物之一，对钢的性能有巨大影响。对于高碳钢而言，由于硫含量较高及其脆性，控制MnS的形成是主要问题之一。MnS在液态和固态钢凝固过程中以及与氧化物夹杂物的界面处具有复杂的析出机制。高碳钢中较高的硫含量、较低的熔点以及不同的氧化物夹杂物会导致MnS在不同阶段析出。在本研究中，通过两种不同类型的高温共聚焦扫描激光显微镜（HTCSLM）全面研究了高碳钢中液态和/或固态MnS析出的不同阶段以及与氧化物夹杂物界面处的情况。使用扫描电子显微镜-能谱仪（SEM-EDS）对样品进行进一步分析，以更好地理解相关机制。通过使用同心凝固技术，在HTCSLM中原位观察了液态钢表面MnS的析出。此外，在具有均匀温度分布的HTCSLM中原位研究了凝固后以及氧化物夹杂物界面处MnS的形成。首次对高碳钢中MnS析出的不同阶段进行了这些全面描述，为控制高碳钢中MnS的形态提供了关键信息。

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