Modelling of high-temperature mechanical behaviour of a single crystal superalloy
Modelling of high-temperature mechanical behaviour of a single crystal superalloy
复制标题
单晶高温合金高温力学行为的建模
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
M. Mclean
中科院分区：
文献类型：
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作者：
L. Pan;B. Shollock;M. Mclean
建立了单晶高温合金各向异性蠕变模型，并利用SRR99合金蠕变试验数据和验证实验对其进行了评价。Ghosh等人（1990）先前的处理认为变形是由两个滑移系统族（八面体{111}{1-10}和立方{001}⟨110⟩）上的粘性剪切引起的，已经扩展到允许描述初级和三级蠕变，并模拟任意加载条件下的变形。描述了一种分析蠕变数据的程序，以给出模型参数的最佳值，并评估了模型在表示数据库和预测复杂方向和复杂加载条件下的变形特征方面的有效性。除了将模型预测与实测变形行为进行比较外，还考虑了模型对由不对称变形引起的试样形状变化和晶体取向变化的影响，并将其与实验测量结果进行了比较。
A model describing the anisotropic creep deformation of single crystal superalloys has been developed and evaluated using both a database of creep tests and validatory experiments on the alloy SRR99. A previous treatment by Ghosh et al. (1990) that considers deformation to occur by viscous shear on two families of slip systems, octahedral {111}{1–10} and cube {001}⟨110⟩, has been extended to allow the description of both primary and tertiary creep, and to simulated deformation under arbitrary loading conditions. A procedure is described for the analysis of the creep data to give the optimum values of the model parameters and the effectiveness of the model in both representing the database and in predicting the deformation characteristics for both complex orientations and complex loading conditions is assessed. In addition to comparison of the model predictions with measured deformation behaviour, the implications of the model for changes in the specimen shape and changes in crystal orientation resulting from asymmetric deformation are considered and compared with experimental measurements.