GCr15轴承钢LF精炼过程中夹杂物的演变机理研究  

Evolution mechanism of inclusions during LF refining process of GCr15 bearing steel

作　　者：雷家柳 杨玲 李德胜 刘月云 袁龙飞 LEI Jialiu;YANG Ling;LI Desheng;LIU Yueyun;YUAN Longfei(Department of Metallurgy Engineering,School of Materials Science and Engineering,Hubei Polytechnic University,Huangshi 435003,China;Hubei Huangshi Product Quality Supervision and Inspection Institute,Huangshi 435000,China;Hubei Key Laboratory for High Quality Special Steel,Daye Special Steel Co.,Ltd.,Huangshi 435000,China)

机构地区：[1]湖北理工学院材料科学与工程学院冶金工程系,湖北黄石435003 [2]湖北省黄石市产品质量监督检验所,湖北黄石435000 [3]大冶特殊钢股份有限公司高品质特殊钢湖北省重点实验室,湖北黄石435000

出　　处：《炼钢》2021年第1期33-38,共6页Steelmaking

基　　金：国家自然科学基金资助项目(51704105);湖北理工学院引进人才项目(17xjz07R)。

摘　　要：为了探索国内某钢厂GCr15轴承钢LF精炼过程中夹杂物的存在形式及形成机理,针对LF精炼过程进行了系统取样,利用ASPEX自动扫描电镜并结合FE-SEM,研究分析了LF精炼过程中夹杂物的演变过程。研究发现,GCr15轴承钢LF精炼开始稳定时,非金属夹杂物主要为Al2O3类夹杂物,到LF精炼终点逐渐演变成近似球形的D类夹杂物。D夹杂物的主要存在形式为Al-Mg-Ca-(S)类复合夹杂物,其次为少部分被CaS包裹的镁铝尖晶石类夹杂物。根据FE-SEM面扫描分析结果,Al-Mg-Ca-(S)类复合夹杂物存在两种形式,一种为CaS包裹的中心均匀分布的CaO-MgO-Al2O3夹杂;另一种中心为MgO·Al2O3夹杂,外围被CaO-Al2O3夹杂包裹,彼此界面清晰。同时,提出了精炼终点D类夹杂物的形成机理。In order to explore the existence form and formation mechanism of inclusions in LF refining process of GCr15 bearing steel in a domestic steel plant,the LF refining process was systematically sampled,and the evolution of inclusions in LF refining process was studied and analyzed using ASPEX automatic scanning electron microscope combined with FE-SEM in this paper.It is found that when the LF refining starts to become stable,the non-metallic inclusions are mainly Al2O3 inclusions,and then evolve into the approximately spherical D inclusions at the end of LF refining process gradually.The main form of D inclusions is Al-Mg-Ca-(S)type composite inclusions,followed by a small part of magnesium aluminum spinel inclusions wrapped by CaS.According to the results of FE-SEM surface scanning analysis,the Al-Mg-Ca-(S)type composite inclusions exist in two forms,one is CaO-MgO-Al2O3 inclusion,distributed in the center uniformly and wrapped by CaS.The other inclusion’s center is MgO·Al2O3,which is surrounded by CaO-Al2O3 inclusion in the periphery with clear interface.At the same time,the formation mechanism of D type inclusions at the end of LF refining process is proposed.

关 键 词：GCR15轴承钢 LF精炼 D类夹杂物 演变机理 

分 类 号：TF769.2[冶金工程—钢铁冶金]