镍基单晶合金蠕变研究:基于晶体塑性的蠕变建模

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Crystal-plasticity-based creep modelins for Ni-based single crystal superalloy

1.
School of Jet Propulsion, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
2.
School of Jet Propulsion, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
3.
Beijing Institute of Aeronautical Materials, Beijing 100095, China

摘要: 在镍基单晶合金高温蠕变建模工作的第二部分,通过提出的蠕变材料模型,在晶体塑性理论的变形梯度与滑移系剪切应变率关系的基础上,结合不同温度下不同滑移系上的蠕变机理,最终建立起滑移系上行为与材料结构变形的联系.材料本构方程的积分采用了四阶Runge-Kutta法,并通过对DD3和CMSX-4两种材料在不同温度,晶体取向和应力水平下的试验曲线进行计算模拟,说明了模型及算法的可行性及对较宽的温度、应力和晶体取向下蠕变行为模拟的能力.
- 镍基单晶合金 /
- 蠕变 /
- 位错密度 /
- 晶体塑性
Abstract: The second part of modeling creep behavior for single crystal superalloy was presented in this paper.and a dislocation-based creep model was devoted to creep predictions.The constitutive equations described the relation between macroscopic strain rate and shear strain rate on slip systems derived from the slip theory,and the activity of various slip systems has been modeled based on the research of microscopic mechanisms.Results obtained by the present approach were compared with creep data with various temperatures and loads in different orientations,including single crystal superalloys DD3 and CMSX-4,to demonstrate the validity and applicability of the proposed model.
- Ni-based single crystal superalloy /
- creep /
- dislocation density /
- crystal plasticity

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