基于微结构动态演化机制的单晶镍基高温合金晶体塑性本构及其有限元模拟
发布时间：2018-12-13 03:43
【摘要】：因其优异的高温力学性能,镍基单晶高温合金在航空航天和能源等领域得到了广泛的应用.镍基单晶高温合金优异的高温性能来源于其特有的两相微结构.基于代表体胞模型及分块均匀化方法,以位错密度为主要内变量,发展了一个包含两相微结构和位错演化信息的单晶镍基高温合金塑性行为的本构模型.该本构模型充分考虑了镍基单晶合金中位错在基体相和沉淀增强相中的多种演化机制,例如,基体位错八面体滑移、立方滑移、位错攀移、交滑移、位错弓出、位错切过沉淀增强相以及位错Kear-Wilsdolf(K-W)锁形成与解锁等.在商用有限元软件ABAQUS的框架下,编制了UMAT用户材料子程序.利用该用户子程序,对单晶和多晶镍基高温合金在不同温度、不同加载方向下的单调塑性、循环塑性、蠕变等典型行为进行了计算模拟.结果表明:该晶体塑性本构模型能"统一地"刻画镍基高温合金在不同温度、不同方向下的多种变形行为,并与实验结果具有良好的一致性.
[Abstract]:Nickel-based single-crystal superalloys have been widely used in aerospace, energy and other fields because of their excellent mechanical properties at high temperature. The excellent high-temperature properties of nickel-based single-crystal superalloys come from its unique two-phase microstructure. Based on the representative cell model and block homogenization method, a constitutive model of the plastic behavior of single crystal nickel-based superalloys with two-phase microstructure and dislocation evolution information was developed, with dislocation density as the main internal variable. The constitutive model fully considers the evolution mechanisms of dislocation in the matrix phase and precipitated enhanced phase in the Ni-base single crystal alloy. For example, the matrix dislocation octahedron slip, cubic slip, dislocation climb, cross-slip, dislocation bow out. Dislocation-cut precipitation enhancement phase and dislocation Kear-Wilsdolf (K-W) lock formation and unlocking. In the framework of commercial finite element software ABAQUS, the UMAT user material subprogram is developed. The typical behaviors of single crystal and polycrystalline nickel base superalloy at different temperatures and different loading directions such as monotone plastic cyclic plasticity creep and so on are simulated by using the user subroutine. The results show that the crystal plastic constitutive model can describe the deformation behavior of nickel-based superalloys at different temperatures and in different directions "uniformly", and it is in good agreement with the experimental results.
【作者单位】： 华中科技大学力学系;工程结构分析与安全评定湖北省重点实验室;
【基金】：国家自然科学基金资助项目(11472113,11272128)
【分类号】：TG132.3
本文编号：2375811
[Abstract]:Nickel-based single-crystal superalloys have been widely used in aerospace, energy and other fields because of their excellent mechanical properties at high temperature. The excellent high-temperature properties of nickel-based single-crystal superalloys come from its unique two-phase microstructure. Based on the representative cell model and block homogenization method, a constitutive model of the plastic behavior of single crystal nickel-based superalloys with two-phase microstructure and dislocation evolution information was developed, with dislocation density as the main internal variable. The constitutive model fully considers the evolution mechanisms of dislocation in the matrix phase and precipitated enhanced phase in the Ni-base single crystal alloy. For example, the matrix dislocation octahedron slip, cubic slip, dislocation climb, cross-slip, dislocation bow out. Dislocation-cut precipitation enhancement phase and dislocation Kear-Wilsdolf (K-W) lock formation and unlocking. In the framework of commercial finite element software ABAQUS, the UMAT user material subprogram is developed. The typical behaviors of single crystal and polycrystalline nickel base superalloy at different temperatures and different loading directions such as monotone plastic cyclic plasticity creep and so on are simulated by using the user subroutine. The results show that the crystal plastic constitutive model can describe the deformation behavior of nickel-based superalloys at different temperatures and in different directions "uniformly", and it is in good agreement with the experimental results.
【作者单位】： 华中科技大学力学系;工程结构分析与安全评定湖北省重点实验室;
【基金】：国家自然科学基金资助项目(11472113,11272128)
【分类号】：TG132.3
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