【摘要】 采用光学显微镜、扫描电子显微镜、XRD和高温力学试验机,研究了固溶强化XG3232合金在1 100℃的恒温氧化及20～1 100℃的拉伸变形行为。结果显示,在氧化初始阶段,表面形成了Cr2O3,NiO和(Ni,Mn,Cr)3O4混合氧化膜。长时间氧化后,氧化膜由单层转变为双层,在内层形成连续的Cr2O3膜,在外层形成可以抑制内层Cr2O3挥发的致密NiO氧化膜。在拉伸实验中,1 100℃时强度可达到131 MPa,延伸率可达66.2%。在650℃以下,随温度的升高,合金的抗拉和屈服强度缓慢减小,在650℃以上合金的抗拉强度迅速减小,屈服强度基本不变;在650℃以下延伸率和断面收缩率变化较小,在650℃以上则迅速增大。更多还原

【Abstract】 The isothermal oxidation behavior at 1 100℃ and tensile deformation behavior at the range of 20℃ to 1 100℃ of solution strengthening XG3232 wrought superalloy were investigated systematically by optical microscopy,scanning electron microscopy,X-ray diffraction and elevated temperature mechanical testing machine.The results show that the oxide film consisting of Cr2O3,NiO and(Ni,Mn,Cr)3O4 is formed on the alloy surface at the initial stage of oxidation.After long time oxidation,the oxide film transforms form monolayer to bilayer,and continuous Cr2O3 film forms in inner layer and compact NiO oxide film restrained volatile of inner layer Cr2O3 forms in outer layer.The superalloy exhibits a strength of 131 MPa and elongation of 66.2% at 1 100℃ in tensile test.The ultimate and yield strength of the alloy gradually decrease with increase of temperature when the temperature is below 650℃.Above 650℃,the ultimate strength decreases rapidly and the yield strength remains.Meanwhile,the elongation and section shrinkage varies slightly below 650℃ while increases rapidly above 650℃.更多还原