Abstract Testing of Ni-base superalloy single crystals with circular notched miniature tensile creep (CNMTC) specimens
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Testing of Ni-base superalloy single crystals with circular notched miniature tensile creep (CNMTC) specimens

机译：用圆形缺口微型拉伸蠕变（CNMTC）样品测试镍基高温合金单晶

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AbstractThe present work introduces a novel circular notched miniature tensile creep (CNMTC) specimen which is used to study the influence of notches on creep and of multiaxial stress states on microstructural evolution in Ni-based single crystal (SX) superalloys. It is briefly discussed how mild circular notches affect the stress state in the notch root of a tensile bar during elastic loading. Then the stress redistribution under creep conditions is calculated using the finite element method (FEM), assuming isotropic material behavior. Two series of interrupted creep experiments with the Ni-based single crystal superalloy ERBO1 (CMSX-4 type) were then performed at 950°C, with flat uniaxial miniature tensile creep (FUMTC) and CNMTC <100> specimens, respectively. The evolution of cavities and microcracks in both types of specimens was carefully analyzed after 81, 169, and 306h. In the uniaxial experiments, a growth of cast pores and the formation of new creep cavities were observed. These degradation processes were much less pronounced in the circular notched specimens. The results of the present work are discussed in the light of previous findings on the influence of multiaxial stress states on creep in single crystal superalloys.
机译： 摘要 本工作介绍了一种新型的圆形缺口微型拉伸蠕变（CNMTC）标本，用于研究缺口对蠕变的影响以及多轴应力状态对微结构演化的影响。镍基单晶（SX）高温合金。简要讨论了在弹性载荷过程中，温和的圆形槽口如何影响拉伸杆槽口根部的应力状态。然后，假设各向同性的材料行为，使用有限元方法（FEM）计算蠕变条件下的应力重新分布。然后在950°C下分别使用扁平的单轴微型拉伸蠕变（FUMTC）和CNMTC <100>样品，进行了两个基于Ni基单晶高温合金ERBO1（CMSX-4型）的间断蠕变实验。在81、169和306h后，仔细分析了这两种类型的样品中空腔和微裂纹的演变。在单轴实验中，观察到铸造孔的生长和新的蠕变腔的形成。这些降解过程在圆形缺口样品中不那么明显。根据先前的研究结果对单轴高温合金中多轴应力状态对蠕变的影响进行了讨论。

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