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首页> 外文期刊>Materials Science and Engineering >From as-cast to heat treated X-40 superalloy: Effect of cooling rate after partial solution treatment on microstructural evolutions and mechanical properties
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From as-cast to heat treated X-40 superalloy: Effect of cooling rate after partial solution treatment on microstructural evolutions and mechanical properties

机译：从浇铸到热处理的X-40超合金：局部溶液处理后的冷却速率对微观结构演进和机械性能的影响

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摘要

This research study aims at investigating the influence of partial solution treatment and the subsequent cooling strategy on the microstructure and mechanical properties of an as-cast Co-Cr-W superalloy. Three different cooling scenarios were employed to explore the effect of cooling rate on the carbide reprecipitation potential from the solid solution formed during the heat treatment. The partial dissolution/breakdown of the continuous network of the Cr-rich M_7C_3 carbides during the partial solution treatment cycle along with their transformation to M_(23)C_6 carbides and formation of secondary carbides during the cooling stage were taken into account to discuss the obtained hardness values, and high-temperature creep results. Regardless of the applied cooling rate, the secondary carbides were formed during the cooling stage, and the heat-treated samples showed almost the same microstructure and mechanical properties, which eliminates the need for the aging cycle. This can alleviate the concerns associated with the heat treatment of the large-size X-40 industrial components since the gradient in the cooling rate after the heat treatment cycle would not lead to non-uniform parts. From the hardness and creep viewpoints, all of the samples could meet the minimum requirements of the X-40 superalloy. Mechanical properties suggest that the applied partial solution treatment cycle can be considered as a suitable candidate for high-temperature applications of X-40 superalloy.
机译：本研究旨在研究部分溶液处理的影响以及随后的冷却策略对铸造CO-CR-W超合金的微观结构和力学性能。使用三种不同的冷却场景来探讨冷却速率对热处理期间形成的碳化物再沉淀电位的影响。在部分溶液处理循环期间，在部分溶液处理循环期间连续网络的连续/分解与其转化为M_（23）C_6碳化物，并考虑到在冷却阶段期间的二次碳化物的形成，以讨论获得的硬度值，高温蠕变效果。无论施加的冷却速率如何，在冷却阶段形成二次碳化物，热处理样品几乎相同的微观结构和机械性能，消除了对老化循环的需要。这可以缓解与大尺寸X-40工业部件的热处理相关的担忧，因为在热处理循环后冷却速率的梯度不会导致不均匀的部件。从硬度和蠕变观点来看，所有样品都可以满足X-40超合金的最小要求。机械性能表明，应用的部分溶液处理循环可以被认为是X-40超合金的高温应用的合适候选者。

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