Abstract: In order to meet the requirements of high performance and high thermal efficiency of aeroengine, the gradual increase of alloying elements in nickel-based powder metallurgy (PM) superalloys leads to high deformation resistance, poor thermoplasticity and narrow hot working window of the PM superalloys, which restricts the preparation and application of the alloy. The γ′ precipitate with high volume fraction in PM superalloys plays a role in microstructure control during hot working. The evolution of γ′ precipitates affects the hot deformation behavior and hot workability of the PM superalloys. Understanding the evolution law of γ′ precipitates is of great significance to control the microstructural evolution and optimize the hot working process of superalloys. In this paper, the dissolution of γ′ precipitates in the hot working process of nickel-based PM superalloys is discussed. The research works on the dissolution behaviors of γ′ precipitates, influence factors and prediction models are reviewed. At pre-sent, the dissolution mechanism of precipitates in high volume fraction multi-particle system is not clear, whether there is splitting and agglomeration behavior in the dissolution process of γ′ precipitate and its influence mechanism, the interaction mechanism between dislocation and γ′ precipitate in the thermal deformation process and the dissolution kinetics of γ′ precipitate need to be further studied.
通讯作者: *黄海亮,烟台大学精准材料高等研究院讲师、硕士研究生导师。2011年辽宁科技大学材料科学与工程专业本科毕业,2014年辽宁科技大学材料科学与工程专业硕士毕业,2020年北京科技大学材料科学与工程专业博士毕业。目前主要从事高温合金组织、性能调控等方面的研究工作。发表论文20余篇,包括Journal of Alloys and Compounds、Intermetallics、Metallurgical and Materials Transactions A等。huanghailiang894@163.com
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