Evolution behavior of γ″ phase of IN718 superalloy in temperature/stress coupled field

Deng, Hanzhong; Wang, Lei; Liu, Yang; Song, Xiping; Meng, Fanqiang; Huang, Shuo

doi:10.1007/s12613-021-2317-z

Cited by 7 publications

(1 citation statement)

References 39 publications

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“…However, some methods give information about the changes of the nanoscale structure for the points of the macroscopic areas. These include, for example, the positron annihilation spectroscopy (PAS) method [20,32] or the Mössbauer spectroscopy (MS) method [33], as well as X-ray diffraction methods [20,[34][35][36][37]. In the PAS and MS methods, data for each measuring point are collected from a sample area of several tens of mm 2 , while the X-ray diffraction methods allow for collecting data from the area above one mm 2 .…”

Section: Introductionmentioning

confidence: 99%

Correlation between the Dendritic Structure and Lattice Parameter of γ′-Phase in Single-Crystalline Turbine Blades Made of Superalloys

Krawczyk

Bogdanowicz

2022

Materials

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The dendritic structure and the distribution of the γ′‑phase lattice parameter (aγ′) along selected lines of the longitudinal section in a model single-crystalline blade made of CMSX-4® nickel-based superalloy were studied. It was established that there is a correlation between the value of the aγ′ and the predomination of initial or ending fragments of the secondary dendrite arms. It is most noticed for the areas where the dendrite growth conditions are similar to steady. They are located in the center and near the root’s selector extension (SE) area. The correlation has been related to the dendritic segregation mechanism. It was shown that in the single-crystalline blades obtained by the directional crystallization using a spiral selector, the “walls” of the primary dendrite arms that grow at a low angle to the blade axis are created. It was found for the first time that the value of the lattice parameter aγ′ is decreased near such “walls”. Additionally, it was found that competitive growth of the dendrites may occur at a distance of even several millimeters from the bottom surface of the root. The first-time applied X-ray diffraction measurements of aγ′ made in a single-pass along the line allow the analysis of the dendritic segregation in the whole blade cast.

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