摘要
本文以国内某厂重轨钢U71Mn为例,开展了不同Al2O3质量分数精炼渣对重轨钢中夹杂物的影响研究.研究结果表明:在实验室条件下,钢中全氧质量分数随着精炼渣中CaO/SiO2的增加逐渐降低,钢中夹杂物的平均直径随渣中Al2O3质量分数的增加先减小后增大.夹杂物中氧化铝质量分数随着渣中Al2O3质量分数降低而降低,当渣中Al2O3质量分数低于30%时,精炼渣中Al2O3质量分数对夹杂物中氧化铝质量分数影响不大.试样中较大尺寸夹杂物均是以Al2O3·MgO为核心的包裹型夹杂,部分试样在Al2O3·MgO外侧包有少量的SiO2,并随着渣中CaO/SiO2值增加而逐渐减少.夹杂物最外侧为硫化物包裹层,且随着CaO/SiO2增加包裹范围逐渐变小.
Taking U71Mn heavy rail steel from domestic factory as an example,the effects of different mass fractions of Al2O3 refining slag components on inclusions in heavy rail steel were carried out,whose results show that under laboratory conditions,the total oxygen mass fraction in steel decreases with the increase of CaO/SiO2 in refining slag.The average diameter of the inclusions in steel decreases first and then increases with the increase of the mass fraction of Al2O3 in slag.The mass fraction of alumina in inclusions decreases with the decrease of Al2O3 mass fraction in slag.However,when the mass fraction of Al 2O3 in slag is less than 30%,the mass fraction of alumina in refining slag has little effect on the mass fraction of alumina in inclusions.The larger size inclusions in the experimental furnace are all wrapped inclusions with Al2O3·MgO as the core.Some of the furnaces contain a small amount of SiO2 on the outside of Al2O3·MgO,and gradually decrease with the increase of CaO/SiO2 in the slag.The outer part of inclusion is sulfide inclusion,and the range of encapsulation decreases with the increase of CaO/SiO2.
作者
康旭
战东平
杨永坤
屈乐欣
刘越
姜周华
张慧书
Kang Xu;Zhan Dongping;Yang yongkun;Qu Lexin;Liu Yue;Jiang Zhouhua;Zhang Huishu(School of Metallurgy,Northeastern University,Shenyang 110819,China;School of Metallurgy Engineering,Liaoning Institute of Science and Technology,Benxi 117004,China)
出处
《材料与冶金学报》
CAS
北大核心
2019年第4期237-241,共5页
Journal of Materials and Metallurgy
基金
国家重点研发计划项目(2017YFB0304205)
中央高校基本科研业务费(N180725021)
