不同温度下DD6单晶高温合金的燃气热腐蚀行为研究  

Hot Gas Corrosion Behavior of Single Crystal Superalloy DD6 at Different Temperature

作　　者：杨丽媛 张骐 孙志华 刘明 赵明亮 YANG Li-yuan;ZHANG Qi;SUN Zhi-hua;LIU Ming;ZHAO Ming-liang(Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China)

机构地区：[1]北京航空材料研究院航空材料先进腐蚀与防护航空科技重点实验室,北京100095

出　　处：《装备环境工程》2023年第12期20-25,共6页Equipment Environmental Engineering

摘　　要：目的研究DD6高温合金在650、800、950℃等3种典型温度的燃气热腐环境下的耐腐蚀性能。方法采用X射线衍射(XRD)、扫描电镜(SEM)、能谱仪(EDS)等测试方法,研究不同温度下DD6高温合金的热腐蚀行为。结果与结论随着温度的升高,合金的腐蚀速率呈逐渐增加的趋势。当温度为650、800℃时,合金的腐蚀速率较小;当温度为950℃时,表面腐蚀产物明显剥落,腐蚀程度明显增加。在650℃下,DD6合金的腐蚀层较薄,主要为NiO、Al2O3等氧化物。在800、950℃下,腐蚀层分为2层,外层由2部分构成,最外侧为一薄层NiO和Co3O4等的混合物,次外层为相对疏松的NiO,内层为Al2O3和Cr2O3构成的相对致密的腐蚀层。腐蚀层下方的基体中,出现了γ'相退化区,并且出现了明显的内硫化现象,加剧了热腐蚀作用。The work aims to study the corrosion resistance of DD6 super alloy in three typical hot gas corrosion environments at 650℃,800℃and 950℃.The corrosion behavior of DD6 super alloy was investigated by X-Ray Diffraction,scanning election microscopy and energy dispersive X-ray spectrum(EDS).The hot corrosion rate of alloy increased with the increase of temperature.The hot corrosion rates at 650℃and 800℃were relatively low.Significant spallation of corrosion products and obvious corrosion occurred at 950℃.The corrosion layer of DD6 alloy at 650℃was relatively thin,mainly composed of oxides such as NiO and Al2O3.The corrosion products were divided into two layers at 800℃and 950℃.The outer layer consisted of two parts,the outermost layer was a mixture of a thin layer of NiO and Co3O4,the secondary layer was loose NiO and the inner layer was a relatively dense corrosion layer composed of Al2O3 and Cr2O3.The phaseγ'degradation zone appeared in the alloy below the corrosion layer,and there was obvious internal vulcanization phenomenon which accelerated the hot corrosion.

关 键 词：DD6 单晶高温合金 燃气热腐蚀 微观形貌 内硫化 

分 类 号：TG132.3[一般工业技术—材料科学与工程]