Strengthening of Fe-Cr-Al-Y Oxidation Resistant Alloy

Abstract

An investigation of oxide dispersion strengthening (ODS) of oxidation resistant FeCrAlY alloys was conducted using argon atomized prealloyed powders and a modified SAP technique. The main objectives were to: improve surface stability; establish uniform powder pre-oxidation techniques; and improve the stress-rupture properties to the level exhibited by TD NiCr sheet. Increased chromium content proved very successful in eliminating 'breakaway' oxidation. Several powder pre-oxidation techniques were identified which provide uniform oxidation and prevention of nitrogen contamination. Target weight gains were consistently achieved. Rupture stress of the ODS FeCrAlY bar was raised to the 9.0 ksi level through the addition of 6 v/o oxide and is now comparable in strength to TD NiCr at temperatures above 2000F. If a density correction is applied to the rupture stress, ODS FeCrAlY is superior to TD NiCr at temperatures above approximately 1800F.

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Document Details

Document Type
Technical Report
Publication Date
May 06, 1973
Accession Number
AD0911469

Entities

People

  • R. J. Perkins
  • Ross Allen

Organizations

  • General Electric

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Body Weight
  • Chemical Analysis
  • Chemistry
  • Contamination
  • Dispersions
  • Electron Microscopes
  • Electron Microscopy
  • Grain Size
  • Materials
  • Materials Laboratories
  • Microscopes
  • Oxidation
  • Oxidation Resistance
  • Physics Laboratories
  • Scanning Electron Microscopes
  • Temperature Gradients
  • Test And Evaluation

Readers

  • Materials Science and Engineering.
  • Powder metallurgy of Titanium alloys.