不同稀土含量的GDL-1钢中贝氏体相变研究  

Research on bainite transformation in GDL-1 steels with different rare earth content

作　　者：梁益龙[1] 谭起兵[1] 李光新[1] 汪航[1] 

机构地区：[1]贵州大学材料科学与冶金工程学院贵州省材料结构与强度重点实验室,贵州贵阳550003

出　　处：《兵器材料科学与工程》2008年第3期31-34,共4页Ordnance Material Science and Engineering

基　　金：贵州省创新基金项目(024015);贵阳市科技产业化项目(20041);贵州省人才专项基金

摘　　要：在不同稀土含量的GDL-1钢中,采用不同温度下中断空冷淬火的方法研究稀土对低碳合金贝氏体钢中贝氏体相变的影响。稀土含量增加,Bs点由380℃降为350℃,残留奥氏体量的增多,贝氏体铁素体的体积分数减小,显微硬度值略微升高。稀土对贝氏体激发形核和台阶生长之间的竞争也产生了重要的影响,增加稀土的量,贝氏体亚结构的细化程度更加明显,细小的亚片条、亚单元之间被稳定的残留奥氏体薄膜所分割,最终形成贝氏体多层次精细结构。The effects of rare earth on bainite transformation were investigated by interruption quenching during continuous cooling in GDL-1 bainite steel. With the increase of RE content, Bs point reduced from 380℃ to 350 ℃, residual austenite amount increased, the volume fraction of bainitic ferrite decreased, and microhardness increased slightly. Rare earth content had a significant impact between the level of competition of sympathetic nucleation and ledgewise growth of bainite. Substructure in bainite was finer with the mixed rare earth content increasing. The bainite steel was divided by stable residual austenites between subplates and subunits, and eventually formed multi-level fine microstructure of bainite.

关 键 词：稀土 低碳合金钢 中断淬火 贝氏体相变 

分 类 号：TG142.30[一般工业技术—材料科学与工程]