Supersolvus Hot Workability and Dynamic Recrystallization in Wrought Co–Al–W-Base Alloys.
Supersolvus Hot Workability and Dynamic Recrystallization in Wrought Co–Al–W-Base Alloys.
复制标题
变形钴铝钨基合金的超溶线热加工性和动态再结晶。
DOI：
10.1007/978-3-030-51834-9_84
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Semiatin, S.L.
中科院分区：
文献类型：
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作者：
Wertz, K.;Weaver, D.;Wen, D.;Titus, M.S.;Shivpuri, R.;Niezgoda, S.R.;Mills, M.J.;Semiatin, S.L.
伽马强化 Co-Al-W 基高温合金提供了可焊性、机械强度、抗蠕变性和高温环境耐受性的独特组合，导致许多人认为该系统可作为下一代涡轮发动机硬件的镍基高温合金的替代品。然而，关于将这些新型合金转变为具有适当的微观结构细化的可用产品形式所需的变形处理的信息很少。在工业相关温度和变形率下，使用两种锻造 γ' 强化钴基高温合金的直圆柱镦锻样品成功演示了超溶线热机械加工序列。对热流行为和微观结构演变进行了定量表征，并与传统镍基系统 Waspaloy 的现有信息进行了比较。此外，密度泛函理论被用来探索影响模型 Ni-Al 二元和 Co-Al-W 三元系统单相热加工行为的固有材料特性的成分依赖性。 Co-Al-W基体系及其两相γ-γ'镍基体系的超溶线热机械加工行为明显相似，这表明可以利用传统途径、模型和设备来加速可变形Co-Al-W基合金的过渡和实施，以用于其性能可能有利的部件。
Gamma-prime strengthened Co–Al–W-based superalloys offer a unique combination of weldability, mechanical strength, creep resistance, and environmental resistance at temperature—leading many to consider the system as an alternative to nickel-base superalloys for future generation turbine engine hardware. However, little information exists regarding the deformation processing required to turn these novel alloys into useable product forms with appropriate microstructure refinement. Supersolvus thermomechanical processing sequences were successfully demonstrated using right-cylindrical upset specimens for two wroughtγ′-strengthened cobalt-base superalloys at industrially relevant temperatures and deformation rates. Hot flow behavior and microstructure evolution were quantitatively characterized and compared to available information on a legacy nickel-base system, Waspaloy. Further, density functional theory was used to explore the compositional dependency of the intrinsic material properties influencing single-phase hot working behavior of model Ni–Al binary and Co–Al–W ternary systems. The apparent similarity in the supersolvus thermomechanical processing behavior of Co–Al–W-base systems and their two-phaseγ–γ′ Ni-base counterparts suggests conventional pathways, models, and equipment may be leveraged to speed transition and implementation of wrought Co–Al–W-base alloys for components where their properties may be advantageous.