Abstract The effect of surface preparation and crystal orientation was investigated for a TMS-138 single crystal superalloy under Type I and Type II hot corrosion conditions. The superalloy was cut along the {100} and {110} planes on which grit blasting, mechanical polishing and electro-polishing surface finishes were conducted. At 900 °C grit blasting or electropolishing distorted the surface and altered the γ-γ’ structure of the alloy provoking higher corrosion rates than on mechanically polished surfaces. The electropolished surface revealed that crystal planes with higher atomic number density have an increased corrosion resistance. The anisotropy effects were not observed with Type II exposures.

中文翻译：

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表面处理和晶体取向对镍基单晶高温合金热腐蚀的影响

摘要 研究了 TMS-138 单晶高温合金在 I 类和 II 类热腐蚀条件下的表面处理和晶体取向的影响。高温合金沿 {100} 和 {110} 平面进行切割，在这些平面上进行喷砂、机械抛光和电抛光表面处理。在 900 °C 时喷砂或电解抛光会使表面变形并改变合金的 γ-γ' 结构，导致比机械抛光表面更高的腐蚀速率。电抛光表面表明，具有较高原子序数密度的晶面具有更高的耐腐蚀性。在 II 类暴露中未观察到各向异性效应。