Grain Growth Behavior of 5Cr21Mn9Ni4N Steel Micro-Alloyed by Rare Earth

查看全文 作　　者：Yu [1]Shichang;Wu [1]Shenqing;Gong [2]Youjun;Gong [2]Yuansheng;Lian [2]Mingsheng;Ye [2]Gang;Cheng [2]Yijun 机构地区：[1]Department of Material Science and Engineering, Southeast University, Nanjing 210096, China;[2]Jiangsu Shenyuan Special Steel Co. , Ltd. , Xinghua 225722, China 出　　处：《Journal of Rare Earths》索引2006年第24卷第1期,共1页 摘　　要：Grain growth behavior of 5Cr21Mn9Ni4NRE steel was experimentally studied at various solid solution treatment temperatures and holding for different times. The experimental results show that the 5Cr21Mn9Ni4NRE steel has the feature of sharp austenite grain coarsening after solid solution treatment at the temperature above 1150 ℃. RE added in the steel has the benefit to restrain grain growth and increase grain growth activation energy. Grain growth mechanism is self-diffusion controlling process. The dispersed carbo-nitride in the steel greatly restrains grain growth. Solid solution treatment at the temperature below 1100 ℃ leads to little increase of grain size and little decrease of Rockwell hardness for mass carbo-nitride undissolved, whereas solid solution treatment at the temperature above 1150 ℃ leads to rapid grain coarsening and Rockwell hardness decrease. Grain growth exponent increases with the increasing solid solution treatment temperature. 关 键 词：5CR21MN9NI4N 稀土 微合金化 晶粒长大 合金钢