含La钢的γ→α块状相变  

γ→α Massive Transformation of Steel Containing La

作　　者：刘宗昌[1] 任慧平[1] 

机构地区：[1]内蒙古科技大学材料与冶金工程学院,内蒙古包头014010

出　　处：《热处理》2007年第1期34-38,共5页Heat Treatment

基　　金：内蒙古自治区科技攻关项目:编号20030201

摘　　要：研究了含La高纯钢的相变,发现固溶La对γ→α相变产生明显的影响,La细化了铁素体晶粒,提高了硬度。在冰盐水中淬火时,La使γ→α多型性转变按块状相变方式进行,铁素体晶界呈现不规则形貌,呈块状,有时呈条片状或针状。探讨了块状相变的机理,块状相变速度很快,是界面热激活控制的。The phase transformation of high purity steel containing La was investigated. The study shown that the solutionized La would produce obvious effect on γ→α transformation. Element La would refine the ferrite grains and increase hardness. During the quenching in the ice-cold brine La would make γ→α transformation proceed according to massive transformation. The ferrite grain boundary would appear as irregular figure, such as block or piece or a acicular sometimes. The massive transfromation mechanism was probed. The results revealed that the massive transformation proceeded at a high speed and was controlled by hot activation of boundary.

关 键 词：块状相变 铁素体 镧 热激活 

分 类 号：TG111.5[金属学及工艺—物理冶金]