Powder Metallurgy Superalloys for Gas Turbine Engines.

Abstract

A program was conducted to develop powder metallurgy techniques for the optimization of alloys for gas turbine blades. A unique process was used consisting of blending metastable carbides and Y2O3 with carbon free base alloy MAR-M-246 by attrition and consolidating this blend by hot extrusion. This was followed by heat treatments designed to solution the metastable carbides and to grow either a minimum ASTM No. 2-3 grain size or a columnar grain size followed by precipitation of discrete particle grain boundary carbides during aging heat treatments. Mechanical property results indicated that while the 1400F tensile properties of the powder metallurgy alloys developed in the program were comparable to those for cast MAR-M-246, the 1900F/15 ksi stress rupture properties were substantially below those for the cast alloy. Hot corrosion results indicated that while the poor resistance of base alloy MAR-M-246 was improved by the addition of Y2O3 dispersoid, its resistance was still not comparable to other cast nickel-base superalloys. (Modified author abstract)

Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1974
Accession Number
AD0782625

Entities

People

  • Charles S. Kortovich

Tags

Communities of Interest

  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Alloys
  • Gas Turbine Blades
  • Gas Turbines
  • Grain Boundaries
  • Grain Size
  • Heat Treatment
  • Materials
  • Mechanical Properties
  • Metallurgy
  • Powder Metallurgy
  • Powders
  • Resistance
  • Rotor Blades (Turbomachinery)
  • Tensile Properties
  • Turbine Blades
  • Turbines

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.