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.
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)
出处
《装备环境工程》
CAS
2023年第12期20-25,共6页
Equipment Environmental Engineering
关键词
DD6
单晶高温合金
燃气热腐蚀
微观形貌
内硫化
DD6
single crystal super alloy
hot gas corrosion
microstructure
internal vulcanization
