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采用扫描电镜(SEM)和能谱分析(EDS)方法研究了拉晶速率对DZ417G合金γ’相和碳化物形态,以及对合金900℃下氧化行为的影响。结果表明,随着拉晶速率的增大,合金中γ’相细化,碳化物由细小颗粒变成棒状,合金900℃下100 h的氧化速率呈逐渐降低再升高的趋势。合金氧化层主要由3层组成,氧化外层主要为Ni、Co、Cr和V的氧化物,而在过渡层中富含Cr、Al元素,形成Cr、Al的氧化物,内层形成Ni的氧化物。当拉晶速率为7 mm/min时,合金的氧化速率最低,合金过渡层中致密的Cr、Al的氧化物层阻碍了氧的向内扩散,使合金具有良好的抗氧化性能。
The effects of crystal pulling rate on γ ’phase and carbide morphology of DZ417G alloy and the oxidation behavior at 900 ℃ were investigated by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results show that with the increase of the pulling rate, the γ ’phase of the alloy is refined and the carbides change from fine particles into rod shape. The oxidation rate of the alloy at 900 ℃ for 100 h decreases gradually and then increases. The alloy oxide layer is mainly composed of three layers, the outer oxide layer is mainly the oxides of Ni, Co, Cr and V, while the transition layer is rich in Cr and Al elements to form oxides of Cr and Al, and the inner layer forms Ni Oxide. When the crystal pulling rate is 7 mm / min, the oxidation rate of the alloy is the lowest. The dense oxide layer of Cr and Al in the alloy transitional layer hinders the inward diffusion of oxygen and the alloy has good oxidation resistance.