奥氏体耐热钢表面氧化物再生长及剥落行为研究  

Study on Re-growth and Exfoliation of the Oxide Scale Formed on Austenitic Heat Resistant Steel

作　　者：徐洪[1] 梁志远[2] 孙和泰[1] 杨贤彪[1] XU Hong;LIANG Zhi-yuan;SUN He-tai;YANG Xian-biao(Jiangsu Frontier Electric Technology Co.,Ltd.,Nanjing,China,Post Code ： 211102;Key Laboratory of Thermal Fluid Science and Engineering of MOE,Xi＇an Jiaotong University,Xi＇an,China,Post Code ： 710049)

机构地区：[1]江苏方天电力技术有限公司,江苏南京211102 [2]西安交通大学热流科学与工程教育部重点实验室,陕西西安710049

出　　处：《热能动力工程》2018年第11期93-100,共8页Journal of Engineering for Thermal Energy and Power

基　　金：国家重点研发计划(2016YFC0801904);中国自然科学基金(51806166);中国博士后基金(2017M620451,2018T111061)~~

摘　　要：以外层铁氧化物剥落的奥氏体耐热钢管为研究对象,在680℃水蒸气环境中进行了800 h的蒸汽氧化试验。结果表明：铁离子通过复杂的铁铬氧化物向外扩散,形成铁氧化物为主的氧化外层,同时,铁铬氧化物沿晶界不断向耐热钢基体延伸,形成典型的双层氧化膜结构;外氧化层生长到一定程度后,由于内外氧化膜氧化物颗粒尺寸差异而发生局部剥落。Re-growth and exfoliation behaviors in steam environment were investigated. Steam of the oxide scale formed on austenitic heat resistant steel oxidation test of austenitic heat resistant steel TP347HFG was conducted at 680 ℃ for 800 hours, whose outer oxide layer spalled. Double-layer oxide scales were developed by the diffusion of Fe ions through complex Fe-Cr oxide scale to the steam/oxide interface and prior oxidation at grain boundaries. The newly formed Fe oxide scale was prone to spalling after long-term exposure to steam, which was attributed to the different oxide sizes of outer and inner oxide scales.

关 键 词：蒸汽氧化 剥落 再生长行为 奥氏体耐热钢 

分 类 号：TG172[金属学及工艺—金属表面处理]