Abstract To understand how to tailor microstructure of high-Co polycrystalline superalloys during hot processing, the flow curves of a nickel-based superalloy with high Co content was quantitatively analyzed, and the microstructure evolution was studied by a high-throughput method. The results suggested that hot working conditions, especially the temperature, strongly influenced the grain structure at annealing. In specific, deforming under low strain rate and high temperature conditions facilitated the recovery and grain growth to consume the stored strain energy, furthermore, the weakened pinning effects of γ′ precipitates accelerated these procedures, which made the high-Co superalloy more vulnerable to the formation of abnormally large grains during subsequent supersolvus annealing.

中文翻译：

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一种新型高钴粉末冶金高温合金在热加工过程中的流动行为和显微组织演变

摘要 为了解如何在热加工过程中调整高钴多晶高温合金的微观结构，定量分析了高钴含量镍基高温合金的流动曲线，并通过高通量方法研究了微观结构演变。结果表明，热加工条件，尤其是温度，强烈影响退火时的晶粒结构。具体而言，低应变率和高温条件下的变形促进了恢复和晶粒生长以消耗储存的应变能，此外，γ'析出物的钉扎效应减弱加速了这些过程，这使得高Co高温合金更容易受到在随后的超溶线退火过程中形成异常大的晶粒。