The effect of manganese and silicon additions on the corrosion resistance of a polycrystalline nickel-based superalloy
The effect of manganese and silicon additions on the corrosion resistance of a polycrystalline nickel-based superalloy
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DOI：
10.1016/j.corsci.2020.109042
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发表时间：
2020-11-01
影响因子：
8.3
通讯作者：
Pedrazzini, S.
中科院分区：
文献类型：
--
作者：
Anzini, E.;Glaenzer, N.;Pedrazzini, S.
镍高温合金的使用寿命通常受到环境退化的限制。本研究比较了多晶高温合金的三种变体在750 ℃下的氧化、硫化和热腐蚀：基线合金、含有1重量% Mn的变体和含有0.5重量% Si的变体。Mn降低了氧化速率而不改变氧化膜的形貌。形成的MnCr 2 O 4氧化皮被证明对硫化和热腐蚀具有更好的保护作用，但内部硫化物延长了损伤深度。Si改性的氧化物的形态连续的Cr2 O3-Al 2 O3双层。这提供了改进的保护，使硫化深度减少2/3，热腐蚀深度减少1/2。
The service lives of nickel superalloys are often limited by environmental degradation. The present study compares oxidation, sulfidation and hot corrosion at 750 degrees C of three variants of a polycrystalline superalloy: a baseline alloy, a variant containing 1 wt% Mn and one containing 0.5 wt% 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.