表面加工状态对Super 304H钢抗蒸汽氧化性能的影响  

Effect of Surface Treatment on Steam Oxidation Resistance of Steel Super 304H

作　　者：马云海[1] 郑开云[1] 林富生[1] 吾之英[1] 

机构地区：[1]上海发电设备成套设计研究院,上海200240

出　　处：《动力工程学报》2013年第7期572-580,共9页Journal of Chinese Society of Power Engineering

摘　　要：对6种不同表面加工状态(磨床粗磨、砂轮磨削、320号砂纸研磨、600号砂纸研磨、1200号砂纸研磨和抛光)的Super 304H钢在650℃/25MPa超临界水蒸气中的氧化行为进行了研究,采用增重法对氧化1 200h后的试样单位表面上的质量变化进行了测量,采用扫描电镜(SEM)和能谱仪(EDS)对氧化膜表面和截面形貌、微观结构和元素分布进行了分析,并利用X射线衍射仪(XRD)对氧化膜物相进行了表征.结果表明:Super 304H钢的抗蒸汽氧化性能对材料的表面加工状态比较敏感;不同表面加工状态的Super 304H钢经氧化后,试样单位表面上的质量变化、表面氧化物形态以及横截面氧化物形态差异明显;形成的典型氧化膜分内、外2层,外层氧化膜主要为Fe3O4,内层氧化膜主要为含Cr量较高的(Fe,Cr)3O4以及少量的Cr2O3;随着材料表面粗糙度的增加和比表面应变层的形成,越容易形成具有保护性的富铬氧化膜,Super 304H钢的抗蒸汽氧化性能越好.Oxidation behaviors of steel Super 304H in water vapour atmosphere at 650 ℃/25 MPa were studied under six surface conditions, i. e. with sample surfaces respectively treated by coarse grinder, grin- ding wheel, abrasive paper grits 320, 600 and 1200, and with polished surface, during which the samples after 1 200 h oxidation were weighted using gravimetric method, while the morphology and microstructure of oxide layers analyzed by SEM and EDS, and corresponding phases characterized by XRD. Results show that the steam oxidation resistance of steel Super 304H is relatively sensitive to the surface state of samples; different surface state results in different mass variation, oxide morphology and microstructure of samples; the typical oxide films generally consist of two layers, the outer layer is mainly Fe3O4, while the inner layer mainly Cr-rich （Fe,Cr）3O4 with a small amount of Cr2O3. Protective Cr-rich oxide films are easy to form on surfaces of lower finish with strained layer, when better steam oxidation resistance is to be generated.

关 键 词：Super 304H钢 表面加工 蒸汽氧化 显微分析 

分 类 号：TG113.2[金属学及工艺—物理冶金]