摘要
非金属夹杂物类型、数量、尺寸、形貌对SWRCH22A冷镦钢开裂有重要的影响。为了研究SWRCH22A冷镦钢凝固冷却过程中非金属夹杂物的转变,通过Aspex夹杂物自动分析仪对连铸过程钢中非金属夹杂物类型、数量、尺寸、形貌进行观察。研究发现,实际生产中,中间包钢液中夹杂物主要为Al2O3-CaO类夹杂物,而铸坯中夹杂物主要为MgO-CaO-Al2O3-CaS夹杂物,连铸过程中夹杂物从Al2O3-CaO转变为MgO-CaO-Al2O3-CaS。铸坯中夹杂物数密度和面积分数小于中间包中夹杂物数密度和面积分数。此外,通过FactSage热力学计算软件计算了SWRCH22A冷镦钢凝固冷却过程中夹杂物的转变相图和成分,为连铸过程钢中夹杂物的转变提供理论解释。
The type,number,size and morphology of non-metallic inclusions have an important influence on cracking of SWRCH22 A cold heading steels.In order to investigate the transformation of non-metallic inclusions in SWRCH22 Acold heading steels during cooling and solidification,the type,number,size and morphology of non-metallic inclusions during the continuous casting process were analyzed using Aspex inclusions analyzer.In industrial production,inclusions in molten steel were mainly Al2O3-CaO,but inclusions in billet were mainly MgO-CaO-Al2O3-CaS,which indicated that inclusions shifted from Al2O3-CaO to MgO-CaO-Al2O3-CaS during the continuous casting process.Number density and area fraction of inclusions in billet were smaller than those of inclusions in tundish.Moreover,the transformation and composition of inclusions during cooling and solidification were calculated using FactSage,which can provide a theoretical explanation for the experimental results.
出处
《中国冶金》
CAS
北大核心
2018年第S1期90-94,共5页
China Metallurgy
基金
国家自然科学基金资助项目(51725402)
关键词
冷镦钢
凝固冷却
夹杂物转变
cold heading steel
solidification and cooling
transformation of inclusions
