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Material Sciences 2022
一种基于微结构的高温合金损伤演化模型及蠕变行为计算
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Abstract:
镍基高温合金的微结构由以Ni为主的γ基体相和以Ni3Al为主的γ'强化相构成，经过一系列工艺处理之后，颗粒将会较为有序地排布在基体中，并在两相间形成共格两相界面。γ'强化相的含量和分布对于镍基高温合金的力学性能有决定性的影响，是镍基高温合金多尺度设计方法中“成分(工艺)–微结构–性能”链条上的重要微结构要素。本文针对镍基高温合金，基于高温合金的蠕变变形机制，建立了计及微结构因素的晶体塑性损伤模型，根据实验所的γ'含量、分布和蠕变曲线，对模型参数进行了标定，并基于此模型，对不同γ'含量和分布的合金进行了蠕变性能的预测，以期为合金的设计提供参考。
The microstructure of nickel base superalloy is dominated by matrix phase γ based Ni and strengthening phase γ' based Ni3Al, the particles will be orderly arranged in the matrix and form a coherent two-phase interface between the two phases. The strengthening phase γ' have a decisive impact on the mechanical properties of nickel base superalloys. It is an important microstructure element in the “Composition (process)-Microstructure-Performance” chain in the multi-scale design method of nickel base superalloys. Based on the creep deformation mechanism of nickel base superalloy, a crystal plastic damage model considering the changes of microstructure is established in this paper. The model parameters are calibrated based on the content, distribution and creep curve γ'. The creep properties of the alloy were predicted in order to provide a reference for the design of the alloy.
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