渗碳气氛中FeCrNi系耐热钢电热辐射管的失效机理研究.pdf

渗碳气氛中Fe—Cr-Ni系耐热钢 电热辐射管的失效机理研究 罗新民，陈康敏，潘励 (江苏大学材料科学与工程学院，江苏镇江212013) 摘要：应用SEM电镜分析和能谱分析及x射线衍射等方法分析研究了高镍铬含氮和稀土的奥氏体型耐热钢电热 辐射管在长期高温渗碳环境运行中的失效机理。试验结果表明．在长期高温渗碳环境下，辐射管工作面上碳原子 的不断渗入，导致碳化物连续长大，主要合金元素铬在基体的贫化和辐射管内壁严重氧化，催化丝状积碳是耐热 钢辐射管失效的主因。 关键词：奥氏体；耐热钢；辐射管；失效分析； ThefailureoftheradianttubemadeofFe-Cr-Niaustenific steed refractory underthe atmosphere earburlzing LUOXinmin，CHEN Li Kangmin，PAN ofMaterialScienceand (School Engineering，JiangsuUniversity Zheoiang，Jiangsu212013，China) REthe tubemadeoftheaustenitic steel and in Abstract：Thefailureoftheradiant refractorycontaininghighCr,Ni，N unilmeml environmentanditsdiffusion were elevated aluminizinginvestigatedby long．term temperaturecarbud面“g and with tothe ofthe meansofXRDSEM penetratingcarbon，the analysisenergy·spectrum(EDS)．Dueprogressive chromium the cavities．h in austaniteThe invasionin咒versedirection interior and oxidized dilutionthe oxygen producedporous isdiscoveredthatthefilametuou|s,carbonand becamethe sootcatalyzedbymetallicnickelatthecarbonizingatmosphere dominantfactortocausethetubesfail steel，radianttube，failureanalysis， Keywords：Austenite，heatresistant I前言 为了替代昂贵的APMT