Effect of Alloying on the Microstructure, Phase Stability, Hardness, and Partitioning Behavior of a New Dual-Superlattice Nickel-Based Superalloy
Effect of Alloying on the Microstructure, Phase Stability, Hardness, and Partitioning Behavior of a New Dual-Superlattice Nickel-Based Superalloy
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合金化对新型双超晶格镍基高温合金显微组织、相稳定性、硬度和分配行为的影响
DOI：
10.1007/s11661-023-06972-7
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Rodenkirchen C
中科院分区：
文献类型：
--
作者：
Rodenkirchen C
Mignanelliet等人最近报道了一种新型的γ-γ′-γ″双超晶格高温合金，在高温下具有良好的机械性能（见：第9届高温合金718国际研讨会论文集及衍生物：能源，航空航天和工业应用，第679-690页，2018年）。本工作采用国家的最先进的化学和空间表征技术来研究系统添加的Mo，W和Fe和Nb和Al含量的变化的影响相分数，热稳定性，元素分配，和合金的机械性能从这个系统。合金是通过电弧熔炼，然后进行热处理而制成的。采用多尺度表征技术和硬度测试来表征其微观结构、热稳定性和力学性能。然后通过热力学模型解释了这些性质或元素分配行为的变化。一个温和的增加1.8在。% Mo对显微组织和热稳定性有很强的影响：它在热处理过程中最大限度地减少了显微组织粗化，同时没有显着降低γ′固溶线温度。Nb减少0.6at. pct强烈地降低了γ″体积分数，而不影响γ′体积分数。减少的沉淀分数导致合金硬度的显著降低。为了改善加工性能和降低材料成本而加入的Fe降低了γ′固溶线温度，并在热处理过程中引起快速的显微组织粗化，而不影响合金的硬度。Al减少0.4at. pct降低了γ′相体积分数和γ′相固溶温度，但对合金硬度无影响。添加0.9 at. p %W降低了γ '固溶线温度，但增加了两种沉淀物的体积分数。这些数据对于优化当前的合金设计和为未来的合金设计工作提供信息将是非常宝贵的。图形摘要
A novelγ–γ′–γ″ dual-superlattice superalloy, with promising mechanical properties up to elevated temperatures was recently reported by Mignanelliet al. (in: Proceedings of the 9th International Symposium on Superalloy 718 & Derivatives: Energy, Aerospace, and Industrial Applications, pp 679–690, 2018). The present work employs state-of-the-art chemical and spatial characterization techniques to study the effect systematic additions of Mo, W, and Fe and variations in Nb and Al contents have on the phase fraction, thermal stability, elemental partitioning, and mechanical properties of alloys from this system. Alloys were produced through arc melting followed by heat treatment. Multi-scale characterization techniques and hardness testing were employed to characterize their microstructure, thermal stability, and mechanical properties. Alterations in such properties or in elemental partitioning behavior were then explained through thermodynamic modeling. A modest addition of 1.8 at. pct Mo had a strong effect on the microstructure and thermal stability: it minimized microstructural coarsening during heat treatments while not significantly decreasing theγ′ solvus temperature. A reduction of Nb by 0.6 at. pct strongly reduced theγ″ volume fraction, without affecting theγ′ volume fraction. The reduced precipitate fraction led to a significant reduction in alloy hardness. Fe, added to achieve better processability and reduced material cost, decreased theγ′ solvus temperature and caused rapid microstructural coarsening during heat treatments, without affecting alloy hardness. A reduction of Al by 0.4 at. pct reduced theγ′ volume fraction and theγ′ solvus temperature, also without affecting alloy hardness. The addition of 0.9 at. pct W decreased theγ′ solvus temperature but increased both precipitate volume fractions. These data will be invaluable to optimize current alloy design and to inform future alloy design efforts.Graphical Abstract
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