Nb和Ti对444超纯铁素体不锈钢高温氧化行为的影响  

Influence of Nb and Ti on High Temperature Oxidation Behavior of 444 Ultra-pure Ferritic Stainless Steel

作　　者：段秀峰 张晶晶[2,3] 张寿禄[2,3] 李国平[2,3] 卫英慧 Duan Xiufeng;Zhang jingjing;Zhang Shoulu;Li Guoping;Wei Yinghui(College of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024;State Key Laboratory of Advanced Stainless Steel,Taiyuan Iron and Steel(Group)Co Ltd,Taiyuan 030003;Technology Center,Shanxi Taiyuan Stainless Steel Co Ltd,Taiyuan 030003)

机构地区：[1]太原科技大学材料与科学工程学院,太原030024 [2]太原钢铁(集团)有限公司先进不锈钢材料国家重点实验室,太原030003 [3]山西太钢不锈钢股份有限公司技术中心,太原030003

出　　处：《特殊钢》2021年第4期7-11,共5页Special Steel

摘　　要：研究了444Nb和444NbTi不锈钢在1100℃下短时(4 h)高温氧化行为,利用X射线衍射、扫描电子显微镜和能谱仪分析氧化膜物相、微观形貌及化学成分分布。结果表明,444NbTi钢每cm2氧化增重为444Nb钢两倍,这与Ti改变Cr_(2)O_(3)氧化膜缺陷结构相关。444Nb钢存在氧化膜剥落现象,原因可能为Mn的快速扩散促进了Nb向氧化膜与金属界面处扩散,形成内生Nb的氧化物增大了钢的内应力和热应力。444NbTi钢氧化膜中存在树状的基体,增大了界面强度,且发生了明显的Ti、Al内氧化。The short-term(4 h) high-temperature oxidation behavior of 444 Nb and 444 NbTi stainless steel at 1 100 ℃ is investigated by X-ray Diffraction,Scan Electron Microscopy and Energy Dispersive Spectrometer to analyze the phase,microscopic morphology and chemical composition distribution of the oxide film.The results show that the oxidation weight gain per cm^(2) of the 444 NbTi steel is twice that of the 444 Nb steel,which is related to the Ti changing the defect structure of the Cr_(2)0_(3) oxide film.Spallation of oxide film happens to the 444 Nb steel sample,it may be that the rapid diffusion of Mn promotes the diffusion of Nb to the interface between oxide film and metal matrix,and the formation of endogenous Nb oxide increases the internal stress and thermal stress of steel.There is a dendritic matrix in the oxide film of the444 NbTi steel sample,which increases the interfacial strength,and the Ti and Al undergo obvious internal oxidation.

关 键 词：444Nb和444NbTi超纯铁素体不锈钢 高温氧化 氧化膜剥落 扩散 内氧化 

分 类 号：TG142.71[一般工业技术—材料科学与工程]