Microstructure of Steel 5Cr21Mn9Ni4N Alloyed by Rare Earth  

作　　者：YU Shi-chang ZHU Qiu-hua WU Shen-qing GONG You-jun GONG Yuan-sheng LIAN Ming-sheng YE Gang CHENG Yi-jun 

机构地区：[1]Department of Material Science and Engineering, Southeast University, Nanjing 210096, Jiangsu, China [2]Technology Center, Jiangsu Shenyuan Special Steel Company, Xinghua 225722, Jiangsu, China

出　　处：《Journal of Iron and Steel Research International》2006年第2期40-44,共5页

基　　金：ItemSponsoredby2003National"TorchPlan"ofChina(2003EB030408)

摘　　要：The microstructure, composition and shape of precipitated phase under as-cast and finished product state of 5Cr21Mn9Ni4N steel with different rare earth （RE） amount were studied. Mechanical properties of 5Cr21Mn9Ni4N steels withont RE addition and with RE added by 0. 2% in mass percent were tested respectively. The results indicate that the solid solution amount of RE is about 10^-6 -10^-5 order of magnitude in 5Cr21Mn9Ni4N steel. Dendrite of as-cast condition is refined obviously and dimension of interstitial phase is shortened when RE is added by 0.10%-0.20%. But the microstructure will be coarser if surplus RE is added. Precipitated phase under finished product state distributes evenly in nearly same size with RE added by 0. 2% which leads to a largely improved high temperature mechanical property.The microstructure, composition and shape of precipitated phase under as-cast and finished product state of 5Cr21Mn9Ni4N steel with different rare earth （RE） amount were studied. Mechanical properties of 5Cr21Mn9Ni4N steels withont RE addition and with RE added by 0. 2% in mass percent were tested respectively. The results indicate that the solid solution amount of RE is about 10^-6 -10^-5 order of magnitude in 5Cr21Mn9Ni4N steel. Dendrite of as-cast condition is refined obviously and dimension of interstitial phase is shortened when RE is added by 0.10%-0.20%. But the microstructure will be coarser if surplus RE is added. Precipitated phase under finished product state distributes evenly in nearly same size with RE added by 0. 2% which leads to a largely improved high temperature mechanical property.

关 键 词：rare earth 5Cr21Mn9Ni4N steel MICROSTRUCTURE precipitated phase 

分 类 号：TG142.33[一般工业技术—材料科学与工程] TG142.1[金属学及工艺—金属材料]