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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Cooling Rate on Microstructure and Hardness during Solution Treatment and Aging Process of Ti-6Al-4V Alloy for Aerospace Components
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Effect of Cooling Rate on Microstructure and Hardness during Solution Treatment and Aging Process of Ti-6Al-4V Alloy for Aerospace Components

机译：冷却速率对Ti-6Al-4V合金溶液处理和衰老过程中的微观结构和硬度的影响

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摘要

The microstructure and hardness of Ti-6Al-4V alloys were evaluated before and after aging to investigate the effect of the cooling rate at the solution treatment stage of the solution treatment and aging (STA) process for aerospace components. The cooling rate distribution across a Ti-6Al-4V alloy sample representing practical STA process of an aerospace fan disk component was estimated using finite element analysis. The Ti-6Al-4V alloy specimens were solution-treated with the obtained cooling rates, and aged. Experimental WQ of the Ti-6Al-4V alloy specimen in the solution treatment facilitated the retention of the primary alpha phase, while the beta phase was transformed to alpha '. Controlled cooling at slower rates compared to WQ led to the formation of coarser globular alpha and the transformation of beta to alpha+beta lamellae. Subsequent aging of the specimens led to the observation of alpha+beta lamellae in all specimens regardless of the cooling conditions, where the average thickness of the plates in lamellae was higher at slower cooling rates. The specimens exhibited higher hardness values when cooled more quickly at the solution treatment, which was attributed to the formation of thinner alpha plates and/or a higher alpha ' fraction. The hardness value of all specimens increased further after aging, regardless of the cooling conditions, due to precipitation of Ti3Al in the alpha phase and/or fine alpha plates from the alpha ' phase.
机译：对Ti-6Al-4V合金时效前后的显微组织和硬度进行了评估，以研究航空航天部件固溶处理和时效（STA）工艺中固溶处理阶段的冷却速度的影响。通过有限元分析，估算了代表航空风扇盘组件实际STA过程的Ti-6Al-4V合金样品的冷却速率分布。Ti-6Al-4V合金试样按照获得的冷却速度进行固溶处理，并进行时效处理。在固溶处理中，Ti-6Al-4V合金试样的实验WQ促进了初级α相的保留，而β相转变为α相。与WQ相比，以较慢的速率控制冷却导致更粗的球状α的形成，以及β向α+β片层的转变。试样的后续老化导致在所有试样中观察到α+β片层，无论冷却条件如何，其中片层中板材的平均厚度在较慢的冷却速率下更高。在固溶处理时，当冷却速度更快时，试样显示出更高的硬度值，这归因于形成更薄的α板和/或更高的α'分数。所有试样的硬度值在时效后进一步增加，无论冷却条件如何，这是由于Ti3Al在α相中的沉淀和/或α'相的细α板。

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