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Oxidation of Ni-based single crystal after grit-blasting during exposure at high temperature

机译：高温曝光期间砂喷砂后轧制镍钛单晶的氧化

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摘要

The effect of grit-blasting on the oxidation of Ni-based single crystal at 1150 and 1250 degrees C was studied. The oxide scales formed on the samples with or without grit-blasting were characterized by SEM, XRD, EDS, and EPMA. The results indicate that grit-blasting introduces a plenty of oxide nodules with lamellar structure into the oxide scale of samples after oxidation. The oxide nodule is composed of external and internal part. The external part is multi-layered with outer Cr2O3 layer, inner Al2O3 layer and transitional layer. The internal part includes several alternative alloy layers lack of Al and Al2O3 layer. Hf and Ta segregate at the oxide/alloy and oxide/oxide interface in two parts. Two recrystallized grains are formed under the blasted alloy surface after grit-blasting and heat exposure. The formation of oxide nodules accelerates the development of equiaxed recrystallization. Grit-blasting introduces abundant paths of oxygen diffusion and residual stress into the alloy, promoting the formation of oxide nodules and recrystallization.
机译：研究了砂喷砂对1150和1250℃的Ni基单晶氧化的影响。通过SEM，XRD，EDS和EPMA的特征在具有或不具有砂砾喷射的样品上形成的氧化物鳞片。结果表明，砂喷砂引入大量氧化物结节，氧化后的样品的氧化物结构。氧化物结节由外部和内部组成。外部部分是具有外CR2O3层，内部AL2O3层和过渡层的多层。内部部分包括几种替代合金层缺乏Al和Al2O3层。 HF和Ta分离在两部分的氧化物/合金和氧化物/氧化物界面处。在喷砂和热暴露后，在喷砂合金表面下形成两个重结晶晶粒。氧化物结节的形成加速了等轴重结晶的发育。喷砂引入了氧气扩散的丰富路径，并将残留应力进入合金，促进氧化物结节和重结晶的形成。

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