梁伟成,徐光,戴方钦,巫嘉谋,胡海江

• 1:武汉科技大学省部共建耐火材料与冶金国家重点实验室
• 2:湖北省高性能钢铁材料协同创新中心
• 3:黄石山力大通热工设备有限公司

摘要(Abstract)：

采用光学显微镜(OM)、能谱仪(EDS)、X射线衍射仪(XRD)、高温显微镜原位观察等实验手段,分析了ZG40Cr25Ni20奥氏体耐热钢烧损原因。结果表明,随着温度升高,奥氏体晶粒不断长大,碳化物Cr23C6不断形成和长大,碳化物中的Cr含量和碳化物硬度不断增加,奥氏体基体中的Cr含量不断减少。温度过高,碳化物溶解,形成孔洞,促进微裂纹沿晶界的扩展,奥氏体晶粒间的结合力逐渐减弱,基体发生过烧,钢的结晶组织遭到破坏,失去金属原有的塑性和强度,造成高温耐热管失效,孔洞和微裂纹的形成及扩展是材料失效的主要原因。此外,高温显微镜原位观察和热处理实验结果表明,ZG40Cr25Ni20耐热钢中碳化物的溶解温度为1030~1250℃。高温显微镜原位观察为碳化物溶解观察和耐热钢失效分析提供了一种新的方法。

关键词(KeyWords)： 奥氏体耐热钢;碳化物;孔洞;裂纹;失效

Abstract:

Keywords:

基金项目(Foundation): 国家高技术研究发展计划(“863”计划)项目(2012AA03A504)

作者(Author): 梁伟成,徐光,戴方钦,巫嘉谋,胡海江

DOI: 10.13289/j.issn.1009-6264.2017.02.013

参考文献(References)：

• [1]杨亚红,朱丽慧,姜筠,等.650℃持久对HR3C耐热钢析出相的影响[J].材料热处理学报,2013,34(S2):106-110.YANG Ya-hong,ZHU Li-hui,JIANG Jun,et al.Effect of creeping at 650℃on precipitates of HR3C heat-resistant steel[J].Transactions of Materials and Heat Treatment,2013,34(S2):106-110.
• [2]黄竹平,胡正飞,王起江,等.HR3C耐热钢650℃持久性能与断裂行为[J].材料热处理学报,2013,34(11):61-66.HUANG Zhu-ping,HU Zheng-fei,WANG Qi-jiang,et al.Creep rupture property and fracture behavior of HR3C heat-resistant steel at 650℃[J].Transactions of Materials and Heat Treatment,2013,34(11):61-66.
• [3]Beér J M.High efficiency electric power generation:The environmental role[J].Progress in Energy&Combustion Science,2007,33(2):107-134.
• [4]陆传镇,胡正飞,付沛,等.F12耐热钢的性能分析及失效研究[J].金属功能材料,2010,17(6):83-87.LU Chuan-zhen,HU Zheng-fei,FU Pei,et al.Property and degradation analysis of F12 heat-resistant steel[J].Metallic Functional Materials,2010,17(6):83-87.
• [5]宁保群,刘永长,殷红旗,等.超高临界压发电厂锅炉管用铁素体耐热钢的发展现状与研究前景[J].材料导报,2006,20(12):83-86.NING Bao-qun,LIU Yong-chang,YIN Hong-qi,et al.Development and investigation of ferritic heat resistant steels for boiler tube of the advanced power plants[J].Materials Review,2006,20(12):83-86.
• [6]Peng B,Zhang H,Hong J,et al.The evolution of precipitates of 22Cr-25Ni-Mo-Nb-N heat-resistant austenitic steel in long-term creep[J].Materials Science&Engineering A,2010,527(16/17):4424-4430.
• [7]Iseda A,Okada H,Semba H,et al.Long term creep properties and microstructure of SUPER304H,TP347HFG and HR3C for A-USC boilers[J].Energy Materials Materials Science&Engineering for Energy Systems,2013,2(4):199-206.
• [8]Xu G,Liu F,Wang L,et al.A new approach to quantitative analysis of bainitic transformation in a superbainite steel[J].Scripta Materialia,2013,68(11):833-836.
• [9]Shi S,Lippold J C.Microstructure evolution during service exposure of two cast,heat-resisting stainless steels—HP-Nb modified and 20-32 Nb[J].Materials Characterization,2008,59(8):1029-1040.
• [10]Mcleod A C,Bishop C M,Stevens K J,et al.Microstructural characterization and image analysis in ex-service HP alloy stainless steel tubes for ethylene pyrolysis[J].Metallography Microstructure&Analysis,2016,5(3):178-187.
• [11]Mcleod A C,Bishop C M,Stevens K J,et al.Microstructure and carburization detection in HP alloy pyrolysis tubes[J].Metallography Microstructure&Analysis,2015,4(4):273-285.
• [12]Tanaka M,Taguchi J,Kato R.Effects of microstructures on the creep-rupture properties and fracture mechanisms in austenitic heat-resistant steels[J].Materials Science&Engineering A,2005,410(12):79-84.
• [13]Cao J,Gong Y,Yang Z G.Microstructural analysis on creep properties of dissimilar materials joints between T92 martensitic and HR3C austenitic steels[J].Materials Science&Engineering A,2011,528(19):6103-6111.
• [14]罗新民,陈康敏.高镍铬含氮奥氏体耐热钢在高温渗碳环境中的蜕变[J].热处理,2007,22(5):20-25.LUO Xin-min,CHEN Kang-min.Degradation of the Cr-Ni-N austenite refractory steel at temperature carburizing atmosphere[J].Heat Treatment,2007,22(5):20-25.

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