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首页> 美国卫生研究院文献>Materials >Tensile Deformation and Fracture Behaviors of a Nickel-Based Superalloy via In Situ Digital Image Correlation and Synchrotron Radiation X-ray Tomography
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Tensile Deformation and Fracture Behaviors of a Nickel-Based Superalloy via In Situ Digital Image Correlation and Synchrotron Radiation X-ray Tomography

机译：镍基高温合金的原位数字图像关联和同步辐射X射线断层扫描的拉伸变形和断裂行为

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Nickel-based superalloys have become key materials for turbine disks and other aerospace components due to their excellent mechanical properties at high temperatures. Mechanical properties of nickel-based superalloys are closely related to their microstructures. Various heat treatment processes were conducted to obtain the desired microstructures of a nickel-based superalloy in this study. The effect of the initial microstructures on the tensile deformation and fracture behaviors was investigated via in situ digital image correlation (DIC) and synchrotron radiation X-ray tomography (SRXT). The results showed that the size and volume fraction of γ″ and γ′ phases increased with the aging time. The yield strength and the ultimate tensile strength increased due to the precipitation strengthening at the expense of ductility. The surface strain analysis showed severely inhomogeneous deformation. The local strains at the edge of specimens were corresponded to higher void densities. The fracture of carbides occurred owing to the stress concentration, which was caused by the dislocation accumulation. The fracture mode was dimple coalescence ductile fracture.
机译：镍基高温合金由于其在高温下的出色机械性能，已成为涡轮盘和其他航空航天部件的关键材料。镍基高温合金的机械性能与其微观结构密切相关。在这项研究中，进行了各种热处理工艺以获得所需的镍基高温合金显微组织。通过原位数字图像相关（DIC）和同步​​辐射X射线断层扫描（SRXT）研究了初始微观结构对拉伸变形和断裂行为的影响。结果表明，γ′相和γ′相的尺寸和体积分数随时效时间的增加而增大。屈服强度和极限抗拉强度由于析出强化而增加，但以延展性为代价。表面应变分析显示出严重的不均匀变形。标本边缘的局部应变与较高的空隙密度相对应。碳化物的断裂是由于位错累积而引起的应力集中引起的。断裂模式为凹窝合并韧性断裂。

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