A comparison of the solidification behavior of INCOLOY 909 and INCONEL 718 View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1990-01

AUTHORS

M. J. Cieslak, T. J. Headley, G. A. Knorovsky, A. D. Romig, T. Kollie

ABSTRACT

The solidification behavior of two commercial aerospace superalloys, INCOLOY 909 and INCONEL 718, has been examined. Specifically, differential thermal analysis (DTA) revealed that INCOLOY 909 terminates solidification with the formation of a single minor constituent at ≈1198 °C. INCONEL 718 terminates solidification with the formation of two minor constituents, at ≈1257 °C and ~1185 °C, respectively. Metallography performed on the DTA samples confirmed that a single minor constituent was present in INCOLOY 909 while two minor constituents were present in INCONEL 718. Differential thermal analysis samples were also examined by electron probe microanalysis to reveal the patterns of elemental segregation. Arc welds of these alloys were examined by transmission and analytical electron microscopy (TEM and AEM). It was observed that the arc welds of INCOLOY 909 contained only a y/Laves eutectic-like constituent, while the arc welds of INCONEL 718 contained both y/Laves and γ/MC eutectic-like constituents. Compositional analyses of these minor phases revealed that all were enriched in Nb relative to the bulk alloy. The Laves phases were also enriched in Si relative to the bulk alloy concentration. Comparisons of the observed solidification sequences in these alloys with other Nb-bearing austenitic matrix alloys are made. More... »

PAGES

479-488

References to SciGraph publications

  • 1989-10. INCONEL 718: A solidification diagram in METALLURGICAL TRANSACTIONS A
  • 1986-12. The use of new PHACOMP in understanding the solidification microstructure of nickel base alloy weld metal in METALLURGICAL TRANSACTIONS A
  • 1988-09. A melting and solidification study of alloy 625 in METALLURGICAL TRANSACTIONS A
  • Identifiers

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    http://scigraph.springernature.com/pub.10.1007/bf02782428

    DOI

    http://dx.doi.org/10.1007/bf02782428

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