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Microstructural changes in a single crystal Ni-base superalloy induced by plastic straining

机译：塑性应变引起的单晶镍基高温合金的组织变化

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摘要

Morphological changes in the γ/γ' microstructure of a single crystal Ni-base superalloy, CMSX-4, induced by plastic pre-strains and a subsequent heat treatment were experimentally investigated. To study the effects of the straining temperature, uni-axial tensile plastic strains were introduced into the solid cylindrical specimens at room temperature, 700℃ and 900℃. For the evaluation of the roles of strain distribution and residual stress field, compressive loading was applied to ring shaped specimens at the three temperatures. It was found from the experiments that the uni-axial plastic strain at 700℃ and 900℃ could induce directional coarsening after subsequent heat treatment at 1080℃ in the same manner as the rafting phenomena, while the plastic strain applied at room temperature caused a localized morphological change only near slip bands. It was also found by the experiments using the ring shaped specimens that the directional coarsening was governed by the sign and magnitude of residual stress rather than plastic strain. A series of experiments were systematically discussed in terms of the temperature dependencies of the plastic deformation and inhomogeneous relaxation of misfit strain at the γ/γ' interface.
机译：实验研究了由塑料预应变和随后的热处理引起的单晶镍基高温合金CMSX-4的γ/γ'微观结构的形态变化。为了研究应变温度的影响，在室温，700℃和900℃下将单轴拉伸塑性应变引入固体圆柱试样中。为了评估应变分布和残余应力场的作用，在三个温度下对环形试样施加了压缩载荷。从实验中发现，在700℃和900℃下的单轴塑性应变在随后的1080℃热处理后，会以与筏化现象相同的方式引起定向粗化，而在室温下施加的塑性应变导致局部形态变化仅在滑带附近。通过使用环形试样的实验还发现，定向粗化是由残余应力的符号和大小而不是塑性应变决定的。根据塑性变形的温度依赖性和γ/γ'界面失配应变的不均匀松弛，系统地讨论了一系列实验。

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