热处理对新型Ni-Fe基高温合金烟灰/气腐蚀行为的影响  

Effect of Heat Treatment on Corrosion Behavior of a Newly Developed Ni-Fe Based Superalloy in Simulated Coal Ash/Gas Environment

作　　者：黄锦阳[1] 鲁金涛[1] 杨征[1] 刘武[1,2] 杨珍[1] 赵新宝[1] 袁勇[1] HUANG Jinyang;LU Jintao;YANG Zheng;LIU Wu;YANG Zhen;ZHAO Xinbao;YUAN Yong(National Energy R&D Center of Clean and High-Efficiency Fossil-Fired Power Generation Technology,Xi’an Thermal Power Research Institute Co.,Ltd.,Xi’an 710032;College of Materials Science and Engineering,Xi’an University of Technology,Xi’an 710048)

机构地区：[1]西安热工研究院有限公司国家能源清洁高效火力发电技术研发中心,西安710032 [2]西安理工大学材料科学与工程学院,西安710048

出　　处：《材料导报》2017年第A02期349-356,共8页Materials Reports

基　　金：国家自然科学基金(51401163;51401164);中国华能集团公司重点科技项目(ZD-15-HJK02;ZD-15-HJK04)

摘　　要：以针对700℃超超临界燃煤锅炉用高温耐热材料而开发的一种新型Ni-Fe基合金为研究对象,利用扫描电子显微镜(SEM),能谱分析(EDS)及X射线衍射(XRD)等方法分析合金组织结构、腐蚀产物形貌、元素分布和腐蚀产物物相,研究两种热处理制度对合金在模拟锅炉烟灰/气环境中高温腐蚀行为的影响。结果表明,750℃腐蚀500 h后,两种热处理试样表面氧化膜结构完整,腐蚀产物基本一致,主要为富Fe、Cr氧化物,另有少量Al2O3、Ti O2及Ti、Mo的内硫化腐蚀产物,但截面腐蚀形貌差异较大。由不同热处理造成的合金组织结构的变化影响了合金的腐蚀速率,腐蚀前400 h内,1#试样氧化膜较厚,腐蚀增重较大,400 h后,沿晶界内腐蚀现象的加剧导致2#试样的腐蚀增重曲线与1#趋于一致。The corrosion behavior of a newly developed Ni-Fe based superalloy which used in 700℃ultra-supercritical boilers was studied under simulated coal-ash/flue-gas environment after two kinds of heat treatment.The microstructures,morphology,compositions and phases of the corrosion products were analyzed by scanning electron microscope(SEM),energy dispersive spectrometer(EDS)and X-ray diffraction(XRD).The results show that a continuity and integrity oxide film and basic consistent corrosion product are formed on the two samples surface after corrosion at 750℃for 500 h,while the significant differences are obviously observed on the cross section corrosion morphology.The oxide of Fe and Cr is the main corrosion products for the 2 samples,while a small amount of Al2O3,TiO2 and sulfide rich in Ti,Mo is discovered.The microstructural changes caused by different heat treatment processes have influenced the corrosion rates of alloy.The oxide film of sample 1#is thicker and the mass gain is larger in the 400 h of corrosion.After 400 h,the mass gain curves of sample 2#tends to be the same with sample 1#with the increase of the inner corrosion intensifies along the grain boundary.

关 键 词：Ni-Fe基合金 热处理 烟灰/气 腐蚀机理 超超临界 

分 类 号：TG172[金属学及工艺—金属表面处理]