稀土微合金化5Cr21Mn9Ni4N钢高温氧化行为  

High-Temperature Oxidation Behavior of 5Cr21Mn9Ni4N Steel Micro-Alloyed by Rare Earth

作　　者：余式昌[1] 吴申庆[1] 宫友军[2] 宫元生[2] 练明生[2] 叶刚[2] 成义军 

机构地区：[1]东南大学材料科学与工程系,江苏南京210096 [2]江苏申源特钢有限公司,江苏兴化225722

出　　处：《中国稀土学报》2006年第3期333-337,共5页Journal of the Chinese Society of Rare Earths

基　　金：2003国家火炬计划项目(2003EB030408);2006年江苏省科技攻关项目资助

摘　　要：研究了稀土微合金化5Cr21Mn9Ni4N钢在700-900℃范围内的抗氧化性能。结果表明：在700～900℃范围内，5Cr21Mn9Ni4N钢中加入0．2％（质量分数）稀土后，均使氧化指数n增大，氧化速率常数kp减小，氧化激活能增大，稀土的加入没有改变耐热钢氧化膜的相组成，而是改善了氧化膜的结构，提高了氧化膜的热稳定性和粘附性，从而提高了耐热钢的高温抗氧化性能。随着氧化温度的升高，耐热钢氧化膜组成从锰的氧化物为主向铁的氧化物占较大比重转变，致密度和抗剥落性下降，氧化膜中铁的氧化物大量出现和氧化膜疏松是抗氧化性能降低的主要原因。The oxidation resistance of 5Cr21Mn9Ni4N steel micro-alloying by RE at 700 - 900 ℃ was investigated. The results indicate that oxidation exponent n and oxidation activation energy are increased, and oxidation velocity constant kp is decreased when 0.2% RE is added in 5Cr21Mn9Ni4N steel. The addition of RE elements does not alter phase constitution of oxidation scale, however it improves the configuration of oxidation scale, and increases thermal stability and adhesivity of oxidation scale, which results in the raise of oxidation resistance of 5Cr21Mn9Ni4N steel at high temperature. The oxidation scale constitutes of refractory steel transfer from manganic oxide mostly to ferric oxide mostly with the increase of temperature, which leads to descend of compactness and desquamation resistance of oxidation scale. The mass increase of ferric oxide in the oxidation scale and the looseness of oxidation scale are the main reason to descend the oxidation resistance of refractory steel.

关 键 词：5CR21MN9NI4N钢 氧化动力学 氧化膜 抗氧化性能 稀土 

分 类 号：TG142.7[一般工业技术—材料科学与工程]