Hardening Mechanisms in a Cobalt-Base Superalloy

Abstract

A study was made of the heat treatment response and hardening mechanism of an experimental cobalt-base superalloy, AR-213. Solution treatment temperatures in the range of 1800 to 2250 F and aging temperatures from 1200 to 1900 F were investigated. Selected aged specimens corresponding to the 2200 F solution treatment were intensively studied using optical and electron microscopy and x-ray techniques to determine the hardening mechanism. The results of the study show that a maximum aged hardness of R sub C 47 is obtainable. The hardening mechanism is the precipitation of CoA1 from the supersaturated matrix at temperatures between 1400 and 1600 F. This precipitate overages relatively rapidly at temperatures above 1600 F. A tantalum-zirconium carbonitride was also present in the alloy in a surprisingly large amount.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1966
Accession Number
AD0635249

Entities

People

  • Charles S. Lee

Organizations

  • University of Arizona

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Alloys
  • Chemical Analysis
  • Chemical Synthesis
  • Chemistry
  • Crystal Structure
  • Dispersion Hardening
  • Electron Microscopy
  • Heat Treatment
  • Materials
  • Melting Point
  • Microscopes
  • Microscopy
  • Phase Diagrams
  • Physical Metallurgy
  • Precipitation
  • Solid Solutions
  • X-Ray Diffraction

Fields of Study

  • Materials science

Readers

  • Molecular Photonics/Laser Physics
  • Surface Engineering/Surface Coating Technology.
  • Systems Analysis and Design

Technology Areas

  • Microelectronics