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Volume 26 Issue 2
Feb.  2019
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文章导航 >  矿物冶金与材料学报（英文）  > 2019  >  26(2): 222-233
Saeed Aliakbari Sani, Hossein Arabi, Shahram Kheirandish, and Golamreza Ebrahimi, Investigation on the homogenization treatment and element segregation on the microstructure of a γ/γ'-cobalt-based superalloy, Int. J. Miner. Metall. Mater., 26(2019), No. 2, pp. 222-233. https://doi.org/10.1007/s12613-019-1727-7
Cite this article as:
Saeed Aliakbari Sani, Hossein Arabi, Shahram Kheirandish, and Golamreza Ebrahimi, Investigation on the homogenization treatment and element segregation on the microstructure of a γ/γ'-cobalt-based superalloy, Int. J. Miner. Metall. Mater., 26(2019), No. 2, pp. 222-233. https://doi.org/10.1007/s12613-019-1727-7
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研究论文

Investigation on the homogenization treatment and element segregation on the microstructure of a γ/γ'-cobalt-based superalloy

  • School of Materials and Metallurgical Engineering, Iran University of Science and Technology (IUST), Narmak, Tehran 16846-13114, Iran

  • Materials and Polymers Engineering Department, Faculty of Engineering, Hakim Sabzevari University, Sabzevar 96179-75487, Iran

  • 通讯作者:

    Hossein Arabi    E-mail: arabi@iust.ac.ir

  • The aim of the present study was to investigate the effect of element segregation on the microstructure and γ' phase in a γ/γ' cobalt-based superalloy. Several samples were prepared from a cast alloy and homogenized at 1300℃ for different times, with a maximum of 24 h. A microstructural study of the cast alloy using wavelength-dispersive spectroscopic analysis revealed that elements such as Al, Ti, and Ni segregated mostly within interdendritic regions, whereas W atoms were segregated within dendrite cores. With an increase in homogenization time, segregation decreased and the initial dendritic structure was eliminated. Field-emission scanning electron microscopy micrographs showed that the γ' phases in the cores and interdendritic regions of the as-cast alloy were 392 and 124 nm, respectively. The size difference of γ' was found to be due to the different segregation behaviors of constituent elements during solidification. After homogenization, particularly after 16 h, segregation decreased; thus, the size, chemical composition, and hardness of the precipitated γ' phase was mostly uniform throughout the samples.
    • Research Article

    Investigation on the homogenization treatment and element segregation on the microstructure of a γ/γ'-cobalt-based superalloy

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      Abstract
    • The aim of the present study was to investigate the effect of element segregation on the microstructure and γ' phase in a γ/γ' cobalt-based superalloy. Several samples were prepared from a cast alloy and homogenized at 1300℃ for different times, with a maximum of 24 h. A microstructural study of the cast alloy using wavelength-dispersive spectroscopic analysis revealed that elements such as Al, Ti, and Ni segregated mostly within interdendritic regions, whereas W atoms were segregated within dendrite cores. With an increase in homogenization time, segregation decreased and the initial dendritic structure was eliminated. Field-emission scanning electron microscopy micrographs showed that the γ' phases in the cores and interdendritic regions of the as-cast alloy were 392 and 124 nm, respectively. The size difference of γ' was found to be due to the different segregation behaviors of constituent elements during solidification. After homogenization, particularly after 16 h, segregation decreased; thus, the size, chemical composition, and hardness of the precipitated γ' phase was mostly uniform throughout the samples.
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