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首页> 外文期刊>Materials & design >Overgrown grains appearing during sub-solvus heat treatment in a polycrystalline γ-γ' Nickel-based superalloy
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Overgrown grains appearing during sub-solvus heat treatment in a polycrystalline γ-γ' Nickel-based superalloy

机译：多晶γ-γ'镍基高温合金在亚固溶热处理过程中出现过长晶粒

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摘要

The present article focuses on establishing the nature of excessive grain growth in a new gamma-gamma ' superalloy, by investigating the underlying driving forces. Excessive grain growth upon annealing after deformation is a common phenomenon among Nickel-based superalloys. It shares common features with abnormal grain growth, but is fundamentally different, since not driven by capillarity forces. It consists in the selective and exaggerated growth of some grains, leading to the formation of heterogeneous microstructures and dramatically decreased mechanical properties. The present study demonstrates that the stored energy in the deformed matrix is the key driving force for exaggerated grain growth. The self-impingement of those grains is the main phenomenon limiting their growth, as Zener pinning by second-phase particles plays a minor role in the process. The absence of stored energy in the overgrown grains, the kinetics of their development and the existence of an incubation time before their appearance in the microstructures lead to the conclusion that excessive grain growth is a case of "critical" static recrystallization, involving a limited amount of nuclei. By evaluating the magnitude of the driving forces in presence before annealing, the microstructure evolutions during further annealing can be predicted, independently from the processing conditions. (C) 2018 Elsevier Ltd. All rights reserved.
机译：本文通过研究潜在的驱动力，着重于建立新型γ-γ高温合金中晶粒过度生长的性质。在镍基高温合金中，变形后退火时晶粒过度生长是普遍现象。它具有异常晶粒生长的共同特征，但由于不受毛细作用力驱动，因此具有根本不同。它包括某些晶粒的选择性和过度生长，导致形成异质的微观结构并显着降低机械性能。本研究表明，变形基质中储存的能量是晶粒过度生长的关键驱动力。这些晶粒的自冲是限制其生长的主要现象，因为第二相粒子的齐纳钉扎在该过程中起着很小的作用。在长满的晶粒中没有储存的能量，其发育的动力学以及在微观结构中出现之前存在孵化时间的结论是，晶粒的过度生长是“关键”静态重结晶的情况，涉及的数量有限原子核通过评估退火之前存在的驱动力的大小，可以独立于工艺条件来预测进一步退火期间的微观结构演变。 （C）2018 Elsevier Ltd.保留所有权利。

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