加热工艺对含Nb共析钢轨钢奥氏体化及固溶行为的影响  

Effect of Heating Process on Austenization and Solution Behavior of Nb Eutectoid Rail Steel

作　　者：杨大巍 邓勇[1] 董雪娇 李晓煜 YANG Dawei;DENG Yong;DONG Xuejiao;LI Xiaoyu(State Key Laboratory for Comprehensive Utilization of Vanadium and Titanium Resources,Pangang Group Research Institute Co.,Ltd.,Panzhihua 617000,China;Sichuan Panyan Testing Technology Co.,Ltd.,Pazhihua 617000,China)

机构地区：[1]攀钢集团研究院有限公司钒钛资源综合利用国家重点实验室,四川攀枝花617000 [2]四川攀研检测技术有限公司,四川攀枝花617000

出　　处：《热加工工艺》2023年第8期152-156,共5页Hot Working Technology

基　　金：四川省科技计划资助项目(2020ZDZX0011)。

摘　　要：研究了不同加热温度、不同Nb含量对共析钢轨钢奥氏体化过程及晶粒尺寸变化的影响,计算了NbC平衡固溶于奥氏体固溶度积公式,采用SEM和EDS分析了含Nb未溶第二相分布位置和形貌。结果表明,1150℃以下,Nb含量对奥氏体晶粒尺寸影响显著,且成线性增长;在1250℃以内,Nb含量的增加对奥氏体晶粒尺寸的影响不显著;修正得到NbC平衡固溶于奥氏体固溶度积公式;不同加热温度下含Nb不溶相的位置和形貌存在差异,在1150℃以下,NbC多分布在奥氏体晶界处,形貌为不规则长条状;在1250℃加热温度下,NbC+微量TiC颗粒少量分布在奥氏体晶界处,大多数分布在晶内,形貌多为较规则菱形或方块状。The effects of different heating temperatures and different Nb contents on the austenitizing process and grain size of eutectoid rail steel were studied.The formula of solid solution product of NbC equilibrium solid solution in austenite was calculated.The distribution position and morphology of insoluble second phase containing Nb were analyzed by SEM and EDS.The results show that the effect of Nb content on austenite grain size is significant and increases linearly below 1150℃,while the effect of Nb content on austenite grain size is not significant within 1250℃.The formula of solid solubility product of NbC equilibrium solid solution in austenite is modified.There are differences in the position and morphology of Nb containing insoluble phase at different heating temperatures.Below 1150℃,NbC is mostly distributed at the austenite grain boundary,and the morphology is irregular long strip.At a heating temperatre of 1250℃,a small amount of NbC+trace TiC particles are distributed at the austenite grain boundary,most of them are distributed in the crystal,and the morphology is mostly regular diamond or square.

关 键 词：加热温度 钢轨 奥氏体 固溶 

分 类 号：TG161[金属学及工艺—热处理]