模铸非调质钢中铁素体在晶内MnS上的形成  

Ferrite Formation on Lntragranular MnS in Ingot Casting Non Heat-treated Steel

作　　者：殷匠[1] 徐淳[1] 

机构地区：[1]宝钢集团上海五钢有限公司研究一所,上海200940

出　　处：《热处理》2004年第1期18-24,共7页Heat Treatment

摘　　要：为确认模铸非调质钢晶内铁素体的形成能力 ,对其钢材组织中的晶内铁素体相变形核位置作了光学显微镜观察 ,SEM /EDS和CMA分析。证实使钢中氧化物分散可调整MnS的大小和数量。模铸非调质钢中同样存在氧化物 -MnS -V(C ,N)复合夹杂物上形成晶内铁素体的过程。由于降低Mn量提高γ -α相变温度增加相变驱动力 ,相应增大了晶内铁素体形核概率 ,研究钢中铁素体在晶内MnS上的形核概率可大于 0 .9,明显优于现有研究结果 ,可弥补模铸钢铁素体形核位置的不足 。Nucleation positin of intragranular ferrite transformation in non heat-treated steel has been studied by means of optical microscope,SEM/EDS and CMA so as to confirm formation ability of IGF (Introgranular Ferrite)in ingot casting non heat-treated steel.Results show that dispersing of xoides will adjust size and quantity of MnS.IGF is also formed on composite inclusion of Al 2O 3-MnS-V(C,N) in ingot casting non heat-treated steel.Because drcreasing of Mn content and raising of r t oα transformation temperature will increase driving force for transformation,nucleation probability of 1GF is relevantly increased.As a result,nucleation probability of ferrite on intragranular MnS will be over 0.9 which is better than previous results,and less nuclaeation position of ferrite in ingot casting steels is made up.Meanwhile,ideal 1GF is gained.

关 键 词：模铸 非调质钢 晶内形核 铁素体相变 SEM EDS CMA 光学显微镜 

分 类 号：TG142[一般工业技术—材料科学与工程] TG111.5[金属学及工艺—金属材料]