摘要
对不锈钢TP347H在超(超)临界流体环境中运行10 000 h后的氧化行为进行分析。采用扫描电镜和能谱仪对TP347H钢的氧化皮截面形貌、元素分布和内壁氧化皮微观形貌进行分析。结果表明:TP347H钢的氧化层由内、外两层组成,外层疏松有孔洞,内层致密。晶界是氧化的活性位置,细化晶粒可促进铬的快速扩散,可起到改善蒸汽抗氧化性能的作用。尖晶石结构在内层氧化层形成。
The oxidation behavior of stainless steel TP347 H in ultra-supercritical fluid environment is analyzed after running for 10,000 hours. Scanning electron microscopy(SEM) and energy dispersive spectrometer(EDS) are used to analyze the cross-section morphology, element distribution and micro-morphology of oxide scale on the inner wall of TP347 H steel. The results show that the oxide layer of TP347 H steel consists of inner and outer layers, the outer layer is porous and the inner layer is dense. Grain boundary is the active site of oxidation. Refining grain can promote the rapid diffusion of chromium and improve the oxidation resistance of steam. Spinel structure is formed in the inner oxide layer.
引文
[1] 钟万里,王伟,梁永纯,等.超临界机组金属高温蒸汽氧化[M].北京:中国电力出版社,2010.ZHONG Wanli,WANG Wei,LIANG Yongchun,et al.High temperature steam oxidation of metals in supercritical units[M].Beijing:China Electric Power Press,2010.
[2] 郭岩,贾建民,侯淑芳,等.国产TP347HFG钢的水蒸汽氧化行为研究[J].腐蚀科学与防护技术,2011,23(6):505-509.GUO Yan,JIA Jianmin,HOU Shufang,et al.Steam oxidation behavior of domestic TP347HFG steel[J].Corrosion Science and Protection Technology,2011,23(6):505-509.
[3] WAS G S,TEYSSEYRE S,JIAO Z.Corrosion of austenitic alloys in supercritical water[J].Corrosion,2006,62:989-1005.
[4] 谢亿,谢国胜,龙会国,等.TP347H耐热钢管在超临界条件下的氧化膜结构及形成机理[J].机械工程材料,2013,37(1):21-24.XIE Yi,XIE Guosheng,LONG Huiguo,et al.Oxide film structure and formation mechanism of TP347H heat-resistant steel pipe under supercritical condition[J].Materials for Mechanical Engineering,2013,37 (1):21-24.
[5] 李兵臣.奥氏体钢TP347H在高温蒸汽中的氧化特性研究[J].科技创新与应用,2015,6(23):90.LI Bingchen.Study on oxidation characteristics of austenitic steel TP347H in high temperature steam[J].Technology Innovation and Application,2015,6(23):90.
