CAJ | 학술논문

超（超）临界机组部分锅炉管长期工作在超临界水环境，其抗氧化性直接影响使用寿命。对T24钢在550℃、25IVIPa超临界水中10-7，3×10^-7和2×10^-6三种溶解氧环境下的氧化性能进行试验研究。天平称重研究氧化增重曲线，采用扫描电镜和能谱仪研究氧化物表面和横截面形貌及元素分布，采用X射线衍射仪对氧化物相结构进行检测。在此基础上探讨溶解氧浓度对T24氧化性能的影响。结果表明：氧化增重随溶解氧浓度的增加而增加；氧化层为典型的双层结构，高溶解氧可能使氧化层转化为多层结构；溶解氧浓度越大氧化物越容易产生裂纹。
초（초）림계궤조부분과로관장기공작재초림계수배경，기항양화성직접영향사용수명。대T24강재550℃、25IVIPa초림계수중10-7，3×10^-7화2×10^-6삼충용해양배경하적양화성능진행시험연구。천평칭중연구양화증중곡선，채용소묘전경화능보의연구양화물표면화횡절면형모급원소분포，채용X사선연사의대양화물상결구진행검측。재차기출상탐토용해양농도대T24양화성능적영향。결과표명：양화증중수용해양농도적증가이증가；양화층위전형적쌍층결구，고용해양가능사양화층전화위다층결구；용해양농도월대양화물월용역산생렬문。
Some boiler tubes in supercritical and ultra supercritical power plant work in supercritical water, the oxidation resistance of which affects directly their lifetime. The oxidation of low alloy steel T24 exposed to supercritical water containing different dissolved oxygen concentration of 10-7, 3×10^-7 and 2×10^-6 at 550 ℃ under 25 MPa was investigated. Weight gains were measured by milligram balance. The surface and cross-sectional morphologies as well as elemental depth profiles were observed by scanning electron microscope （SEM） and energy dispersive X-ray spectroscopy （EDS）. The oxide phase structures were analyzed by X-ray diffraction （XRD）. Based on these observations, the influence of dissolved oxygen concentration on oxidation of T24 was also discussed. The results show that weight gain increases With the dissolved oxygen concentration increasing. The oxide layer is a typical dual-layered structure. High dissolved oxygen can lead to a milt-layered structure. Dissolved oxygen concentration plays an important role on oxide scale exfoliation.