An EBSD Evaluation of the Microstructure of Crept Nimonic 101 for the Validation of a Polycrystal–Plasticity Model

An EBSD Evaluation of the Microstructure of Crept Nimonic 101 for the Validation of a Polycrystal–Plasticity Model
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用于验证多晶塑性模型的蠕变 Nimonic 101 微观结构的 EBSD 评估

DOI:
10.1007/s11665-017-3046-3
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发表时间:
2017
影响因子:
2.3
通讯作者:
H.J. Maier
H.J. Maier
中科院分区:
材料科学4区
文献类型:
--
作者:
S. Reschka;L. Munk;P. Wriggers;H.J. Maier

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Nimonic 101是早期开发用于燃气轮机的镍基高温合金之一。在这样的环境中,材料长时间暴露于高温和机械负荷的组合。因此,热蠕变是最重要的问题,因为它往往限制使用寿命。本研究的重点是蠕变试验,在不同的温度下进行的Nimonic 101在恒定的拉伸载荷为735 MPa。为了表征微观结构的演变,电子背散射衍射(EBSD)测量之前和之后加载。在较高的温度下,观察到的显微结构的显着变化。晶粒伸长并沿载荷轴沿着排列其取向。同时,在经典大变形框架下建立了晶体塑性材料模型。将建模结果与获得的EBSD数据进行比较。
Nimonic 101 is one of the early nickel-based superalloys developed for the use in gas turbines. In such environments, the material is exposed to a combination of both high temperatures and mechanical loads for a long duration. Hence, thermal creep is of the utmost concern as it often limits service life. This study focuses on creep tests, carried out on Nimonic 101 at different temperatures under a constant tensile load of 735 MPa. To characterize the microstructural evolution, electron backscatter diffraction (EBSD) measurements were employed before and after loading. At higher temperatures, a significant change of the microstructure was observed. The grains elongated and aligned their orientation along the load axis. In parallel, a crystal plasticity material model has been set up in the classical large deformation framework. Modeling results are compared to the acquired EBSD data.
小型燃气轮机和自由活塞发动机
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