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Microstructure and Mechanical Properties Of Laser-Processed Ni-Al-Mo Base Alloys

Published online by Cambridge University Press:  15 February 2011

David B. Snow
David B. Snow*
Affiliation:
United Technologies Research Center, East Hartford, Connecticut 06108
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Abstract

The addition of molybdenum to nickel base superalloys which contain a γ′ volume fraction of ≦ 0.35 allows them to be consolidated from powder by laser processing at solidification rates of ∼1040C/s. The as-solidified microstructure of these alloys is dendritic, and consists of a fine dispersion ∼20nm cuboidal γ′ in a supersaturated FCC γ matrix. When annealed at 500–700°C, additional age hardening occurs via the precipitation of ≤l0nm, Dla-structure Ni4Mo, DO22 - structure Ni3Mo and/or Pt2 Mo-structure Ni2Mo. This combined strengthening by very fine γ′ and NixMo dispersions in laser-processed material makes alloys of this type attractive for potential turbine disk applications. However, the 6–15 at % molybdenum required to prevent cracking during laser consolidation renders many of these alloys prone to a previously unreported, embrittling cellular phase transformation, γ + γ′ + NixMo→ γ′ + orthorhombic Ni3Mo, at temperatures of ≦900°C.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 8 , 1981 , 523
Copyright
Copyright © Materials Research Society 1982

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References

REFERENCES

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