RAPID AUSTENIZATION OF A MODIFIED 4340 ALLOY.

Abstract

A modified 4340 alloy used for ordnance applications has been rapidly heated into the austenitic region and then spray water quenched. Two spheroidized and one quenched and tempered microstructures were studied. On rapid heating there is an initial grain refinement of the austenite because the growth of the grains lags behind the nucleation of new grains. The spheroidized alloys had both Fe3C and Mo23C6 carbides while only Fe3C was found in the quenched and tempered alloy. Where the two carbides co-existed the Fe3C dissolved first. The initial microstructure does not significantly affect dissolution of the carbides or the change in the growth of the austenite grains. The experimental results are discussed and compared with the thermally altered layers found in field fired ordnance. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1975
Accession Number
ADA013374

Entities

People

  • R. Griffin

Tags

DTIC Thesaurus Topics

  • Alloys
  • Austenite
  • Chemical Compounds
  • Iron Alloys
  • Metallic Compounds
  • Microstructure
  • Munitions
  • Nucleation

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.