Analysis of the evolution law of oxide inclusions in U75V heavy rail steel during the LF–RH refining process

IF 1.6 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

High Temperature Materials and Processes Pub Date : 2023-01-01 DOI:10.1515/htmp-2022-0257

Hongbo Liu, Rongyuan Xie, Min Li, CaiDong Zhang, Hong-Liang Yao, Zhiqiang Tian, Hai Yang, Zhanlian Liu, Qian Wang, Junyang Kang

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Abstract

Abstract The number density, size and composition of inclusions in U75V heavy rail steel during ladle furnace (LF)–RH refining process were studied by an Aztec-Feature inclusion automatic software which equipped with a field emission microscope. The results showed that the MnO–SiO2–Al2O3-type inclusions were the main inclusions at LF start. The MnO–SiO2–Al2O3-type inclusions were transformed into the CaO–SiO2–Al2O3-type inclusions during the LF refining process because of the Ca and Al elements which were brought by ferroalloy. At the RH start stage, the main inclusions were CaO–SiO2–Al2O3-type inclusions with low melting temperature and CaO–MgO–Al2O3-type inclusions with high melting temperature in the sample. And, the CaO–MgO–Al2O3-type inclusions were obviously removed during RH vacuum treatment. The average compositions of CaO–SiO2–Al2O3-type inclusions had no obvious change from RH vacuum holding for 15 min, RH vacuum break to RH soft blowing.

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U75V重轨钢LF-RH精炼过程中氧化物夹杂物演化规律分析

摘要采用配有场发射显微镜的Aztec-Feature夹杂物自动检测软件，对U75V重轨钢LF -RH精炼过程中夹杂物的数量、密度、大小和组成进行了研究。结果表明:LF启动时主要夹杂物为mno - sio2 - al2o3型夹杂物;在LF精炼过程中，由于铁合金带来了Ca和Al元素，mno - sio2 - al2o3型夹杂物转变为cao - sio2 - al2o3型夹杂物。RH起始阶段，样品中主要夹杂物为低熔点的cao - sio2 - al2o3型夹杂物和高熔点的cao - mgo - al2o3型夹杂物。RH真空处理明显去除cao - mgo - al2o3型夹杂物。从RH真空保持15 min、RH真空中断到RH软吹，cao - sio2 - al2o3型夹杂物的平均成分没有明显变化。

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来源期刊

High Temperature Materials and Processes 工程技术-材料科学：综合

CiteScore

2.50

自引率

0.00%

发文量

审稿时长

3.9 months

期刊介绍： High Temperature Materials and Processes offers an international publication forum for new ideas, insights and results related to high-temperature materials and processes in science and technology. The journal publishes original research papers and short communications addressing topics at the forefront of high-temperature materials research including processing of various materials at high temperatures. Occasionally, reviews of a specific topic are included. The journal also publishes special issues featuring ongoing research programs as well as symposia of high-temperature materials and processes, and other related research activities. Emphasis is placed on the multi-disciplinary nature of high-temperature materials and processes for various materials in a variety of states. Such a nature of the journal will help readers who wish to become acquainted with related subjects by obtaining information of various aspects of high-temperature materials research. The increasing spread of information on these subjects will also help to shed light on relevant topics of high-temperature materials and processes outside of readers’ own core specialties.