ABSTRACT Cooling-induced precipitation of the strengthening γ’ phase is commonly investigated in Ni-base superalloys with a high γ’ volume fraction, where it is used to control the final microstructure and properties. Less is known about the phase separation in low-volume-fraction alloys during cooling, although the microstructural state after cooling from solution treatment is known to affect subsequent heat-treatment steps. We use atomic-scale characterisation of Ni-base superalloy Haynes 282 (equilibrium γ’ volume fraction around 20%) to show that air cooling after solution or carbide stabilisation results in precipitation of nm-sized γ’ particles, whereas precipitation was suppressed during water quenching. The solution treatment has a significant effect on the hardness and γ’ precipitation during air cooling from the subsequent carbide stabilisation temperature. Also, the carbide-stabilisation treatment itself affects the γ’ precipitation during subsequent air cooling.

中文翻译：

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镍基高温合金 Haynes 282 冷却过程中 γ' 的沉淀

摘要 在具有高 γ' 体积分数的 Ni 基高温合金中，通常研究冷却诱导的强化 γ' 相析出，用于控制最终的显微组织和性能。尽管已知从固溶处理冷却后的微观结构状态会影响后续的热处理步骤，但对冷却过程中低体积分数合金的相分离知之甚少。我们使用镍基高温合金 Haynes 282（平衡 γ' 体积分数约为 20%）的原子级表征来表明溶液或碳化物稳定后的空气冷却导致纳米级 γ' 粒子的沉淀，而在水中沉淀被抑制淬火。从随后的碳化物稳定温度开始，固溶处理对空冷过程中的硬度和γ'析出有显着影响。此外，碳化物稳定化处理本身会影响后续空气冷却过程中的 γ' 沉淀。