La对微合金钢中奥氏体组织与析出相的影响  

Effect of Lanthanum on Austenite Recrystallization Behavior of Microalloyed Steel

作　　者：姚兆凤 杨凡 贺兆海 王成猛 王海燕[1,2] YAO Zhao-feng;YANG Fan;HE Zhao-hai;WANG Cheng-meng;WANG Hai-yan(School of Material and Metallurgy,Inner Mongolia University of Science and Technology,Baotou 014010,China;Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resource,Inner Mongolia University of Science and Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010 [2]内蒙古自治区白云鄂博矿多金属资源综合利用重点实验室,内蒙古包头014010

出　　处：《稀土》2020年第5期137-142,共6页Chinese Rare Earths

基　　金：国家自然科学基金(51961030);内蒙古自然科学基金(2019MS05013,2018MS05038)。

摘　　要：以添加La和未添加La的Nb-Ti微合金钢为研究对象,利用金相显微镜分析了加热过程中奥氏体晶粒的长大情况,采用Gleeble-1500D型热模拟机进行热变形实验,在透射电镜下进行析出相形貌观察与能谱分析,并结合硬度测试结果,探究了La对实验钢中奥氏体组织与析出相的影响。结果表明,随着保温时间的增加,奥氏体晶粒逐渐长大,添加La的实验钢奥氏体晶粒长大较快,显微硬度较低。变形过程中,含La实验钢在奥氏体区的碳化物析出相得到了细化,析出物数量减少。Nb-Ti microalloyed steels withor without rare earth lanthanumdoped were investigated in this study.The growth ofaustenite grains during heating was analyzed by metallographic microscope.Thermal deformation experiment was performed on Gleeble-1500D thermal simulator.The morphology and energy spectrum of the precipitatedphase were obtained by TEM.Based on these andthe hardness test results,the effect of lanthanum on austenite microstructure and precipitates in tested steels was studied.The results show that the austenite grains grew gradually withthe increase of holding time.The austenite grains grew faster and microhardness was lower for the tested steel with lanthanum added.In the process of deformation,forthe steel containing lanthanum,the carbide precipitation phases in austeniteregion were refined andthe precipitateswere reduced.

关 键 词：LA NB-TI微合金钢 奥氏体组织 析出相 

分 类 号：TG142.1[一般工业技术—材料科学与工程]