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

被引：6
作者：
Saeed Aliakbari Sani [1 ]
Hossein Arabi [2 ]
Shahram Kheirandish [2 ]
Golamreza Ebrahimi [3 ]
机构：
[1] School of Materials and Metallurgical Engineering, Iran University of Science and Technology ((IUST))
[2] School of Materials and Metallurgical Engineering, Iran University of Science and Technology (IUST)
[3] Materials and Polymers Engineering Department, Faculty of Engineering, Hakim Sabzevari University
来源：
InternationalJournalofMineralsMetallurgyandMaterials | 2019年 / 26卷 / 02期
关键词：
superalloy; segregation; homogenization; microstructure; γ′ phase;
D O I：
暂无
中图分类号：
TG132.3 [特种热性质合金]; TG113 [金相学（金属的组织与性能）];
学科分类号：
080502 ;
摘要：
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°C 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.
引用
收藏
页码：222 / 233
页数：12
相关论文
共 37 条
  • [1] Investigation of Solidification and Segregation Characteristics of Cast Ni-Base Superalloy K417G[J]. Li Gong,Bo Chen,Zhanhui Du,Mengshu Zhang,Ruichang Liu,Kui Liu.Journal of Materials Science & Technology. 2018(03)
  • [2] Diffusion coefficients of transition metals in fcc cobalt[J] . S. Shahab Naghavi,Vinay I. Hegde,C. Wolverton.Acta Materialia . 2017
  • [3] Elemental partitioning, lattice misfit and creep behaviour of Cr containing γ ′ strengthened Co base superalloys[J] . I. Povstugar,C. H. Zenk,R. Li,P.-P. Choi,S. Neumeier,O. Dolotko,M. Hoelzel,M. G?ken,D. Raabe.Materials Science and Technology . 2016 (3)
  • [4] Diffusion of solutes in fcc Cobalt investigated by diffusion couples and first principles kinetic Monte Carlo[J] . S. Neumeier,H.U. Rehman,J. Neuner,C.H. Zenk,S. Michel,S. Schuwalow,J. Rogal,R. Drautz,M. G?ken.Acta Materialia . 2016
  • [5] Novel wrought γ / γ ′ cobalt base superalloys with high strength and improved oxidation resistance[J] . S. Neumeier,L.P. Freund,M. G?ken.Scripta Materialia . 2015
  • [6] Microstructural change and impact toughness property of Inconel 738LC after 12years of service[J] . A.S. Golezani,M. Bageri,R. Samadi.Engineering Failure Analysis . 2015
  • [7] Experimental and phenomenological investigations of diffusion in Co–Al–W alloys[J] . Hui Chang,Guanglong Xu,Xiao-Gang Lu,Lian Zhou,Kiyohito Ishida,Yuwen Cui.Scripta Materialia . 2015
  • [8] The effect of tungsten content on the properties of L1 2 -hardened Co–Al–W alloys[J] . Florian Pyczak,Alexander Bauer,Mathias G?ken,Uwe Lorenz,Steffen Neumeier,Michael Oehring,Jonathan Paul,Norbert Schell,Andreas Schreyer,Andreas Stark,Felix Symanzik.Journal of Alloys and Compounds . 2015
  • [9] The Thermal Stability of Intermetallic Compounds in an As-Cast SX Co-Base Superalloy
    Lopez-Galilea, Inmaculada
    Zenk, Christopher
    Neumeier, Steffen
    Huth, Stephan
    Theisen, Werner
    Goeken, Mathias
    [J]. ADVANCED ENGINEERING MATERIALS, 2015, 17 (06) : 741 - 747
  • [10] Effects of Pulsed Magnetic Field on Microsegregation of Solute Elements in a Ni-Based Single Crystal Superalloy[J] . Yingju Li,Yuefei Teng,Xiaohui Feng,Yuansheng Yang.Journal of Materials Science & Technology . 2015
1234