在高温度梯度真空定向凝固炉中,采用螺旋选晶法制备了不含Y和含0.01％Y的两种单晶高温合金,研究了Y对单晶高温合金900℃燃气热腐蚀性能的影响,采用扫描电镜、X射线衍射分析仪、能谱仪对燃气热腐蚀产物进行了分析.研究结果表明,添加微量Y后,提高了单晶高温合金的燃气热腐蚀性能.Y没有改变腐蚀产物的种类,促进了Al的选择性氧化,减少了NiO.Y减小了腐蚀产物颗粒尺寸和腐蚀产物厚度,消除了腐蚀产物中分层裂纹,增加了腐蚀产物和基体粘附性,减少了腐蚀产物剥落,促进在合金表面形成保护性的腐蚀产物,进而降低了合金的腐蚀速率.
Two experimental single crystal superalloys Y-free alloy and Y-containing alloy were cast in the directionally solidified furnace,while other alloying element contents were basically kept unchanged.The effect of Y on the gas hot corrosion behavior at 900℃ of two single crystal superalloys was studied.Morphology of oxides was examined by SEM and their compostion was analyzed by XRD and EDS.The results showed that the hot corrosion resistance of Ni-base single crystal superalloy is improved by adding a little amount of Y.Y can promote the oxide of Al formation and decreases the proportion of NiO.Y reduces the corrosion layer grain size and the thickness of corrosion layer.Y can eliminate microcrack in the layered corrosion.Y increases the coherence between the oxide scale and the alloy substrate to decrease the spallation of oxide scale.So the corrosion rate of the alloy can be decrease as results of forming protective corrosion layer at the surface of the samples after Y addition.
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