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Metals and Materials

, Volume 2, Issue 4, pp 211–217 | Cite as

Microstructural evolution in a strip-cast Ni-base superalloy

  • D. K. Kim
  • D. H. Kim
  • D. K. Choo
  • H. K. Moon
Article

Abstract

Microstructure and mechanical properties of the strip-cast Ni-base superalloy(Hastelloy-X) alloy have been compared with those of a conventionally ingot-cast alloy. As-cast strip shows a fine columnar dendritic structure as a result of a relatively high cooling rate of 102 -104 K/sec during the process. The alloying elements, such as Cr and Fe, are homogeneously distributed in the γ matrix of the as-cast strip. Whereas, Mo is segregated at the center part of the as-cast strip. Mo distribution, however, becomes homogeneous after cold rolling and subsequent heat treatment at 1175°C. Two types of carbide, a Mo-rich M6C type and a Cr-rich M23C6 type, are present in the γ matrix of the as-cast and rolled strips. Rolling and subsequent heat treatment of the strip-cast alloy results in a fine grain structure compared to the ingot-cast alloy. The γ matrix grains in stripcast and ingot-cast alloy are approximately 14 μm and 34 μm in diameter respectively. Superior tensile properties in the strip-cast alloy is due to the fine microstructural evolution during the process.

Keywords

Cold Rolling Carbide Particle Secondary Phase Particle Rolled Sheet Subsequent Heat Treatment 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer 1996

Authors and Affiliations

  • D. K. Kim
    • 1
  • D. H. Kim
    • 1
    • 2
  • D. K. Choo
    • 1
    • 3
  • H. K. Moon
    • 1
    • 3
  1. 1.Center for Advanced Aerospace MaterialsPohang University of Science and Technology PohangKyungbukKorea
  2. 2.Dept. of Metallurgical EngineeringYonsei UniversitySeodaemun-Ku, SeoulKorea
  3. 3.Research Institute of Industrial Science and Technology PohangKyungbukKorea

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