Microstructural evolution in a strip-cast Ni-base superalloy

D. K. Kim, Do Hyang Kim, D. K. Choo, H. K. Moon

Research output: Contribution to journalArticle

10 Citations (Scopus)

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 102-104K/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 M 23C6 type, are present in the y 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.

Original languageEnglish
Pages (from-to)211-217
Number of pages7
JournalMetals and Materials International
Volume2
Issue number4
DOIs
Publication statusPublished - 1996 Jan 1

Fingerprint

Microstructural evolution
heat resistant alloys
Superalloys
casts
cast alloys
strip
Ingots
ingots
Heat treatment
heat treatment
matrices
Hastelloy (trademark)
Crystal microstructure
Cold rolling
Alloying elements
cold rolling
Tensile properties
tensile properties
Carbides
carbides

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

Cite this

Kim, D. K. ; Kim, Do Hyang ; Choo, D. K. ; Moon, H. K. / Microstructural evolution in a strip-cast Ni-base superalloy. In: Metals and Materials International. 1996 ; Vol. 2, No. 4. pp. 211-217.
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Microstructural evolution in a strip-cast Ni-base superalloy. / Kim, D. K.; Kim, Do Hyang; Choo, D. K.; Moon, H. K.

In: Metals and Materials International, Vol. 2, No. 4, 01.01.1996, p. 211-217.

Research output: Contribution to journalArticle

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