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Ni20Mn6钢连铸板坯中CaS夹杂物的三维形态及分布

The Three-Dimensional Morphology and Distribution of CaS Inclusions in Continuous Casting Slab of Ni20Mn6 Steel.

作者信息

Chen Jing, Zhang Jing, Zheng Shaobo, Zhang Jieyu

机构信息

State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of Advanced Ferrometallurgy, School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China.

出版信息

Materials (Basel). 2020 Sep 3;13(17):3891. doi: 10.3390/ma13173891.

DOI:10.3390/ma13173891
PMID:32899211
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7503743/
Abstract

Calcium sulfide (CaS) inclusion with large and irregular shape is detrimental to the properties of steel. Understanding the shape and distribution of CaS inclusions in a continuous casting (CC) slab is of significance for improving the rolling properties. In this study, CaS inclusions were extracted from CC slab of Ni20Mn6 steel using the electrolytic extraction and investigated by scanning electron microscopy (SEM)-energy dispersive X-ray spectroscopy (EDX). The CaS inclusions morphologies vary with their locations in the CC slab and, thus, are classified into five categories. The thermodynamics calculated results showed that CaS inclusions precipitated at the end of solidification due to the microsegregation of sulfur and calcium in the interdendrite liquid and finally precipitated along the austenite grain boundary. The macrosegregation degree of solutes in different regions is one of the reasons that affect the size of CaS inclusion. The morphologies of CaS inclusion are affected by the solidification structure of slab and austenite grain boundary.

摘要

形状大且不规则的硫化钙（CaS）夹杂物对钢的性能有害。了解连铸（CC）板坯中CaS夹杂物的形状和分布对于改善轧制性能具有重要意义。在本研究中，采用电解萃取法从Ni20Mn6钢的连铸板坯中提取CaS夹杂物，并通过扫描电子显微镜（SEM）-能量色散X射线光谱仪（EDX）进行研究。CaS夹杂物的形态随其在连铸板坯中的位置而变化，因此可分为五类。热力学计算结果表明，由于枝晶间液相中硫和钙的微观偏析，CaS夹杂物在凝固末期析出，最终沿奥氏体晶界析出。不同区域溶质的宏观偏析程度是影响CaS夹杂物尺寸的原因之一。CaS夹杂物的形态受板坯凝固组织和奥氏体晶界的影响。

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本文引用的文献

1
The Effect of Different Non-Metallic Inclusions on the Machinability of Steels.不同非金属夹杂物对钢切削加工性的影响
Materials (Basel). 2015 Feb 16;8(2):751-783. doi: 10.3390/ma8020751.