摘要
通过工业试验对42CrMo4钢进行系统取样,观察试样中典型夹杂物的特征与分布,从热力学角度研究了42CrMo4钢中CaO-MgO-Al_(2)O_(3)夹杂物的形成机理。结果表明,在钢包精炼炉(LF)精炼前期钢液中主要夹杂物为形状不规则的MgO-Al_(2)O_(3)夹杂物,中后期MgO-Al_(2)O_(3)夹杂物中开始出现CaO,在真空精炼炉(VD)精炼阶段,钢液中的夹杂物完全变为液态CaO-MgO-Al_(2)O_(3)夹杂物。经热力学计算,钢液中[Mg]的存在是导致MgO-Al_(2)O_(3)夹杂物大量生成的根本原因,其主要来源于耐火材料和炉渣。在LF精炼阶段耐火材料向钢液传递[Mg]多于炉渣,而在VD精炼阶段炉渣向钢液传递[Mg]更多。
The characteristics and distribution of typical inclusions in 42CrMo4 steel were observed by systematic sampling through industrial tests.The formation mechanism of CaO-MgO-Al_(2)O_(3)inclusions in42CrMo4 steel was studied from the perspective of thermodynamics.The results show that the main inclusions in the liquid steel are irregular MgO-Al_(2)O_(3)inclusions in the early stage of LF refining,and CaO begins to appear in the middle and late stage of MgO-Al_(2)O_(3)inclusions.In the VD refining stage,the inclusions in the liquid steel completely change into liquid CaO-MgO-Al_(2)O_(3)inclusions.According to thermodynamic calculation,the presence of [Mg] in molten steel is the fundamental reason for the formation of a large amount of MgO-Al_(2)O_(3)inclusions,which is mainly derived from refractory materials and slag.The transfer [Mg] from refractory to molten steel is more than that from slag in LF refining stage,while the transfer [Mg] from slag to molten steel is more in VD refining stage.
作者
乔通
成国光
黄宇
李占春
鲍道华
QIAO Tong;CHENG Guoguang;HUANG Yu;LI Zhanchun;BAO Daohua(State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China;Jiangsu Yonggang Group Co.,Ltd.,Zhangjiagang 215600,Jiangsu,China)
出处
《江西冶金》
2022年第5期8-15,共8页
Jiangxi Metallurgy
基金
国家自然科学基金资助项目(51874034)。
