Constitutive modeling of creep behavior in single crystal superalloys: Effects of rafting at high temperatures
Constitutive modeling of creep behavior in single crystal superalloys: Effects of rafting at high temperatures
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单晶高温合金蠕变行为的本构模型：高温漂流的影响
DOI：
10.1016/j.msea.2015.07.058
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发表时间：
2015-09
期刊：
影响因子：
6.4
通讯作者：
Qiu Wen-Hui
中科院分区：
文献类型：
--
作者：
Fan Ya-Nan;Shi Hui-Ji;Qiu Wen-Hui
单晶高温合金的筏化和蠕变模型对于单晶高温合金的安全评估和寿命预测具有重要意义。在这项研究中，一个新的模型已被开发来描述筏化的演变，并纳入Cailletaud单晶塑性模型来模拟蠕变行为。筏化的驱动力被假定为应变能的松弛，并与局部应力状态，外部和失配应力张量的叠加计算。此外，各向同性粗化是通过基于Ostwal熟化的微观组织周期性对蠕变时间的立方根依赖性引入的。在单晶体塑性模型中，考虑了筏化对蠕变变形的影响。用CMSX-4在950 °C和1050 °C下的蠕变实验验证了模型的有效性。它能够预测在复杂的负载条件下的漂流方向和评估漂流过程中的通道宽度。对于[001]拉伸蠕变试验，在不同温度和应力水平下，模型预测与实验结果之间显示出良好的一致性。该模型可以捕捉到蠕变加速过程，并将其归因于析出相粗化引起的组织退化。
Rafting and creep modeling of single crystal superalloys at high temperatures are important for the safety assessment and life prediction in practice. In this research, a new model has been developed to describe the rafting evolution and incorporated into the Cailletaud single crystal plasticity model to simulate the creep behavior. The driving force of rafting is assumed to be the relaxation of the strain energy, and it is calculated with the local stress state, a superposition of the external and misfit stress tensors. In addition, the isotropic coarsening is introduced by the cube root dependence of the microstructure periodicity on creep time based on Ostwal ripening. Then the influence of rafting on creep deformation is taken into account as the Orowan stress in the single crystal plasticity model. The capability of the proposed model is validated with creep experiments of CMSX-4 at 950 °C and 1050 °C. It is able to predict the rafting direction at complex loading conditions and evaluate the channel width during rafting. For [001] tensile creep tests, good agreement has been shown between the model predictions and experimental results at different temperatures and stress levels. The creep acceleration can be captured with this model and is attributed to the microstructure degradation caused by the precipitate coarsening.
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影响因子：
3.3
作者：
B. Fedelich;A. Epishin;T. Link;H. Klingelhöffer;G. Künecke;P. Portella
通讯作者：
B. Fedelich;A. Epishin;T. Link;H. Klingelhöffer;G. Künecke;P. Portella
影响因子：
4.7
作者：
G. Han;J. J. Yu-J.;Zushu Hu;X. Sun
通讯作者：
G. Han;J. J. Yu-J.;Zushu Hu;X. Sun
DOI：
10.1016/j.msea.2011.03.035
发表时间：
2011-06
影响因子：
6.4
作者：
T. Sugui;Z. Shu;Liang Fushun;Li Anan;Liang Jingjing
通讯作者：
T. Sugui;Z. Shu;Liang Fushun;Li Anan;Liang Jingjing
DOI：
10.1016/0036-9748(83)90287-9
发表时间：
1983-10
期刊：
Scripta Metallurgica
影响因子：
--
作者：
R. MacKay;L. J. Ebert
通讯作者：
R. MacKay;L. J. Ebert
影响因子：
9.4
作者：
Reed, RC;Matan, N;Rae, CMF
通讯作者：
Rae, CMF