Abstract The effects of heat treatment on the microstructure and high-temperature oxidation of selective laser melted TiC/IN625 nanocomposites were studied. Refined cellular grains, many dislocation structures and high proportion of sub-grain boundaries appeared in the as-built TiC/IN625 nanocomposites. After heat treatment (HT), the recrystallized grains and annealed twins did not appear in the TiC/IN625 nanocomposites. HT decreased the dislocation density, and most of grain boundaries had high misorientation angles. The HT-TiC/IN625 sample had the smallest parabolic rate. Only a single Cr2O3 oxide layer was formed in the HT-TiC/IN625 sample, meaning the heat treatment yielded a material with higher oxidation resistance.

中文翻译：

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热处理对激光选区熔化制备的 TiC/Inconel 625 纳米复合材料微观结构和高温氧化行为的影响

摘要 研究了热处理对选择性激光熔化TiC/IN625纳米复合材料微观结构和高温氧化的影响。在构建的 TiC/IN625 纳米复合材料中出现了细化的蜂窝状晶粒、许多位错结构和高比例的亚晶界。热处理（HT）后，TiC/IN625 纳米复合材料中没有出现再结晶晶粒和退火孪晶。HT 降低了位错密度，并且大部分晶界具有高取向差角。HT-TiC/IN625 样品具有最小的抛物线率。在 HT-TiC/IN625 样品中仅形成单个 Cr2O3 氧化物层，这意味着热处理产生了具有更高抗氧化性的材料。