P92钢在650℃、30MPa超(超)临界水中的氧化行为  

Oxidation Behavior of P92 Steel in Ultra-Supercritical Water at 650℃ and 30MPa

作　　者：韩永明 尚晨光 HAN Yongming;SHANG Chenguang(National Center for Material Service Safety,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学国家材料服役安全科学中心,北京100083

出　　处：《腐蚀与防护》2025年第4期35-44,共10页Corrosion & Protection

基　　金：中央高校基本科研业务费专项资金资助项目(FRF-TP-24-013A)。

摘　　要：在650℃/30 MPa、含氧量为100μg/L的超临界水中,开展了P92钢的氧化试验。利用拉曼光谱和扫描电镜(SEM)对氧化膜的物相、形貌、结构及元素分布进行了表征,研究了P92钢的氧化行为及机制。结果表明,氧化膜外层、内层及总厚度的增长随时间基本遵循抛物线规律,而内氧化层的厚度基本保持不变。随着氧化时间的增加,表面Fe3O4颗粒的中心孔逐渐愈合,颗粒尺寸逐渐增大,随后在表面形成了一层具有轻微Cr富集的疏松多孔Fe2O3层。内氧化层由细小的氧化物颗粒、沿界面的优先氧化通道以及残余基体组成。随着氧化时间的增加,优先氧化通道最终演变为不连续的富Cr层,导致局部氧化层变薄。氧化膜厚度受微观组织的影响逐渐显著。Ni元素向内层扩散并富集。Oxidation experiments of P92 steel were conducted in supercritical water at 650℃ and 30 MPa with an oxygen content of 100μg/L.The phase,morphology,structure,and elemental distribution of the oxide film were characterized using Raman spectroscopy and scanning electron microscopy(SEM),and the oxidation behavior and mechanisms of P92 steel were investigated.The results show that the growth of the outer layer,inner layer,and total thickness of the oxide film approximately followed a parabolic law over time,while the thickness of the inner oxide layer remained essentially unchanged.With increasing oxidation time,the central pores of the surface Fe3O4 particles gradually healed,and the particle size increased.Subsequently,a loose and porous Fe2O3 layer with slight Cr enrichment formed on the surface.The inner oxide layer consisted of fine oxide particles,preferential oxidation channels along the interface,and residual matrix.As oxidation time increased,the preferential oxidation channels eventually evolved into discontinuous Cr-rich layers,leading to localized thinning of the oxide layer.The thickness of the oxide film became increasingly influenced by the microstructure.Ni elements diffused and enriched in the inner layer.

关 键 词：P92钢 马氏体耐热钢 超临界水 超临界氧化 高温氧化 

分 类 号：TG172.9[金属学及工艺—金属表面处理]