温度对高锰高铝钢氧化动力学规律的影响  

Effect of temperature on oxidation kinetics of high Mn-high Al steel

作　　者：宋明明 门超奇[1,2] 李建立 朱航宇[1,2] 韩赟[3] 薛正良 SONG Ming-ming;MEN Chao-qi;LI Jian-li;ZHU Hang-yu;HAN Yun;XUE Zheng-liang(Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China;Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steeling,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China;Research Institute of Technology,Shougang Group Co.,Ltd.,Beijing 100043,China)

机构地区：[1]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,湖北武汉430081 [2]武汉科技大学钢铁冶金新工艺湖北省重点实验室,湖北武汉430081 [3]首钢集团有限公司技术研究院,北京100043

出　　处：《钢铁》2023年第4期138-147,156,共11页Iron and Steel

基　　金：国家自然科学基金面上资助项目(52074199)。

摘　　要：为了明确高锰高铝钢在高温下氧化的动力学规律,采用恒温氧化法研究了高锰高铝钢在干燥空气中温度为900~1300℃时的氧化行为,利用XRD、SEM+EDS对氧化皮横截面和表面的的物相及形貌结构进行了分析,并利用FactSage软件对样品在不同氧分压和不同氧化温度下生成的物相进行了计算。结果表明,温度为900~1300℃时,高锰高铝钢氧化均遵循抛物线规律。温度小于1100℃时,氧化反应活化能为128.04 kJ/mol,高锰高铝钢氧化皮外层为富锰氧化物,中间层为锰铁氧化物,内层主要是锰铁氧化物还有少量氧化铝。中间层和内层中存在大量的气孔,中间层靠外侧的气孔为束条状气孔,靠内侧为无规则大圆形气孔,内层的气孔多为均匀分布的小尺寸气孔。温度大于1200℃时,氧化反应活化能为212.84 kJ/mol,高锰高铝钢氧化皮有3层,但成分与温度小于1100℃时的氧化结果差异较大,外层为锰铁氧化物,中间层为富锰氧化物,内层以锰铁氧化物为主还均匀分布有少量Al_(2)O_(3)颗粒。高锰高铝钢氧化皮的致密性、连续完整性均优于温度小于1100℃时氧化皮,对氧化过程的阻碍作用明显强于温度小于1100℃时的氧化皮。两温度段的氧化限制性环节在温度小于1100℃时为金属离子的扩散,而在温度大于1200℃时为氧离子的扩散。高锰高铝钢金属基体在氧化过程中,温度小于1100℃时会形成无规则的楔形沿晶氧化物,而在温度大于1200℃时会产生颗粒状锰铁复合氧化物及少量AlN。In order to clarify the oxidation kinetics of high Mn-high Al steel at high temperature,the oxidation behavior of that steel under dry air at 900-1300℃was studied by isothermal oxidation method.Both the morphological structure and phase composition of the scale on cross-section and surface were analyzed by XRD and SEM+EDS.The phase generations under different oxygen partial pressure and different oxidation temperature were calculated by FactSage software.The results showed that the oxidation of high Mn-high Al steel followed the parabolic law at 900-1300℃.The oxidation activation energy was 128.04 kJ/mol when oxidation temperature below 1100℃.The outer layer of scale was rich manganese oxide,the middle layer was manganese-iron oxide,and the inner layer was mainly manganese-iron oxide with a small amount of alumina.There were lots of pores in both the middle layer and the inner layer.The pores near the outer side of the middle layer were bundle pores,and the pores near the inner layer of the middle layer were irregular large round pores.While the pores in the inner layer were mostly small pores distributed evenly.When oxidation temperature above 1200℃,the oxidation activation energy was 212.84 kJ/mol.There were also three layers within the scale of steel,which was quite different from the oxidation result below 1100℃in composition.The outer layer was iron-rich oxide,the middle layer was Mn-rich oxide,the inner layer was mainly iron-manganese oxide with a small amount of Al_(2)O_(3) particles distributed.The density and continuous integrity of the scale were better than that of the scale below 1100℃.The hindrance to the oxidation process was significantly stronger than that of the scale below 1100℃.The oxidation limiting step was the diffusion of metal ions when oxidation temperature below 1100℃.When the oxidation temperature above 1200℃,the oxidation limiting step changed into the diffusion of oxygen ions.During the oxidation process,in the matrix of the steel,irregular wedge-shaped intergranular

关 键 词：高锰高铝钢 高温氧化 氧化动力学 活化能 氧化机制 

分 类 号：TG142.1[一般工业技术—材料科学与工程]