Crystal plasticity modeling of cyclic deformation for a polycrystalline nickel-based superalloy at high temperature
Crystal plasticity modeling of cyclic deformation for a polycrystalline nickel-based superalloy at high temperature
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DOI：
10.1016/j.msea.2010.02.045
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发表时间：
2010-06
期刊：
影响因子：
6.4
通讯作者：
B. Lin;Liguo Zhao;J. Tong;H. Christ
中科院分区：
文献类型：
--
作者：
B. Lin;Liguo Zhao;J. Tong;H. Christ
采用晶体塑性本构方程模拟了一种多晶镍基高温合金的高温循环变形。有限元分析进行了一个代表性的体积元（RVE），随机取向的晶粒组成，并进行周期性的边界约束。模型参数通过拟合650°C下三种不同加载速率的应变控制循环试验数据来确定。模拟结果与实验数据吻合良好的应力-应变循环和循环硬化行为。该模型被用来预测在最大和最小应变水平的保持期间的应力松弛行为，预测与实验结果进行了比较。局部应力和应变集中，观察到由于晶粒微观结构的异质性和不匹配的单个晶粒的机械性能。
Cyclic deformation at elevated temperature has been modeled for a polycrystalline nickel-based superalloy using the crystal-plasticity constitutive formulations. Finite element analyses were carried out for a representative volume element (RVE), consisting of randomly oriented grains and subjected to periodic boundary constraints. Model parameters were determined by fitting the strain-controlled cyclic test data at 650°C for three different loading rates. Simulated results are in good agreement with the experimental data for both stress–strain loops and cyclic hardening behavior. The model was utilized to predict the stress relaxation behavior during the hold periods at the maximum and minimum strain levels, and the prediction compares well with the experimental results. Localized stress and strain concentrations were observed due to the heterogeneous nature of grain microstructure and the mismatch of the mechanical properties of individual grains.