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镍基合金具有优良的高温力学性能,广泛应用于涡轮叶片等热端部件.沉淀相的尺寸和形态是影响镍基合金力学性能的重要因素.论文在考虑应变梯度的镍基合金晶体塑性本构模型的基础上,引入了各向异性损伤张量,研究了包含两种不同尺寸和三种不同长细比的沉淀相形态的镍基合金蠕变行为.结果表明,该模型能够很好地反映沉淀相的尺寸对镍基合金蠕变行为的影响,与实验结果符合较好.同时,沉淀相的形态也对镍基合金的力学性能产生重要影响,随着沉淀相长细比的增加,镍基合金的蠕变寿命延长,这体现了粗化和形态对镍基合金蠕变行为影响的一种竞争的机制.
Ni-based alloy has excellent high-temperature mechanical properties and is widely used in hot end components such as turbine blades.The size and morphology of precipitated phase are important factors affecting the mechanical properties of Ni-based alloys.In this paper, Model, the anisotropic damage tensor was introduced and the creep behavior of nickel-base alloy containing two different size and three different slenderness phases was studied. The results show that the model can well reflect The influence of the size of the precipitated phase on the creep behavior of the Ni-based alloy is in good agreement with the experimental results.At the same time, the morphology of the precipitated phase also has an important effect on the mechanical properties of the Ni-based alloy. With the increase of the slenderness ratio, The creep life of base alloys is prolonged, which shows a competing mechanism of the effects of coarsening and morphology on the creep behavior of Ni-based alloys.