论文标题
锰和硅添加对多晶镍基超合金的耐腐蚀性的影响
The effect of manganese and silicon additions on the corrosion resistance of a polycrystalline nickel-based superalloy
论文作者
论文摘要
镍超合金的服务生活通常受到环境退化的限制。本研究比较了多晶超合金的三种变体的750c时氧化，硫化和热腐蚀：一种基线合金，一种含有1WT％MN的变体和一个含有0.5wt％Si的变体。 MN降低了氧化速率而不改变尺度形态。事实证明，形成的MNCR2O4量表对硫化和热腐蚀更具保护作用，但内部硫化物扩大了损伤深度。 SI将氧化物的形态修改为连续的CR2O3-AL2O3双层。这提供了改进的保护，将硫深度降低了2/3，并将热腐蚀深度降低了1/2。
The service lives of nickel superalloys are often limited by environmental degradation. The present study compares oxidation, sulfidation and hot corrosion at 750C of three variants of a polycrystalline superalloy: a baseline alloy, a variant containing 1wt% Mn and one containing 0.5wt% Si. Mn reduced the oxidation rate without changing the scale morphology. The MnCr2O4 scale formed proved more protective against sulfidation and hot corrosion, but internal sulfides extended the damage depth. Si modified the oxide morphology to a continuous Cr2O3-Al2O3 dual layer. This provided improved protection, reducing the sulfidation depth by 2/3 and the hot corrosion depth by 1/2.
