The influence of the cooling rate on the precipitation behavior of gamma prime (γ′) in a newly developed Co-based superalloy has been investigated by using differential scanning calorimetry. In addition, changes to the γ′ precipitate morphology and size were analyzed by scanning electron microscopy. It was observed that increasing the rate at which the alloy was cooled from high temperatures increased the γ′ precipitation rate at different temperatures but also reduced the temperature at which the maximum precipitation rate occurred and retarded the complete precipitation of the γ′ precipitates. The activation energy required for γ′ precipitation was calculated by using the Kissinger model, revealing that the present alloy exhibits higher activation energy than some Ni-based superalloys, which can be attributed to lower rates of atomic diffusion in cobalt-based superalloys.

中文翻译：

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冷却速度对新开发的钴基高温合金中伽玛素沉淀行为的影响

使用差示扫描量热法研究了冷却速率对新开发的 Co 基高温合金中伽马素 (γ') 析出行为的影响。此外，通过扫描电子显微镜分析了 γ' 沉淀物形态和尺寸的变化。观察到，增加合金从高温冷却的速率会增加不同温度下的 γ' 析出速率，但也会降低出现最大析出速率的温度并延迟 γ' 析出物的完全析出。利用 Kissinger 模型计算了 γ' 析出所需的活化能，表明本合金比某些 Ni 基高温合金具有更高的活化能，