Solidification Structure in La and Ti-containing FeCrAl Stainless Steel
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摘要: 采用金相显微镜（OM）和扫描电镜（SEM）对La、Ti处理的FeCrAl不锈钢铸锭凝固组织进行了分析研究，结果表明：未经La、Ti处理的纯铁素体不锈钢凝固组织中晶粒尺寸较大，纵向截面晶粒平均值为4.64 mm，横向截面晶粒尺寸平均为4.71 mm；La处理不锈钢可以明显细化钢中凝固组织的晶粒尺寸；Ti在细化FeCrAl不锈钢晶粒的同时可以提高不锈钢的等轴晶率；加入La和Ti后形成的高熔点第二相粒子有利于细化晶粒，钢中析出的大量TiN可以提高凝固组织的等轴晶率。Abstract: Optical Microscope(OM) and Scanning Electronic Microscope(SEM) were used to analyze the solidified structure of La and Ti-containing FeCrAl stainless steel.The results show that the grain size in pure ferrite solidified structure without La and Ti treatment can be relatively big with the average values at 4.64 mm in longitudinal section and 4.71 mm in cross section.The grain size can be noticeably refined by addition of La as well as Ti to the steel.In addition,Ti can improve equiaxed grain ratio at the same time.The high-melting point second-phase particle formed after La and Ti addition is beneficial to refine grain and the large amount of TiN separated out in the steel contributes to improve equiaxed grain ratio.
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