MECHANICAL PROPERTIES OF CARBURIZED AUSTENITIC STAINLESS STEELS AS RELATED TO MICROSTRUCTURE.

Abstract

Results are presented for tests carried out on tube tensile specimens of four austenitic stainless steels (AISI Types 304, 316, 321, and 347) carburized in a methane-hydrogen mixture for 1 hr each at 870C (1600F), 925C (1700F), 980C (1800F), and 1040C (1900F). Specimens were carburized on both the external and internal surfaces. The carburized case encompasses two zones: (1) a dark etching area of carbide (Fe.Cr)7C3 and austenite, and (2) a heavily carburized grain boundary area, also (Fe.Cr)7C3, that precedes the bulk carburization area. Both zones are quite brittle and develop cracks under a tensile load. The uncarburized austenite acts in a crack-blunting capacity. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jul 31, 1969
Accession Number
AD0692514

Entities

People

  • James K. Stanley

Organizations

  • The Aerospace Corporation

Tags

DTIC Thesaurus Topics

  • Alloys
  • Austenite
  • Boundaries
  • Chemical Compounds
  • Grain Boundaries
  • Hydrogen
  • Iron Alloys
  • Mechanical Properties
  • Metallic Compounds
  • Microstructure
  • Stainless Steel
  • Steel

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Metallurgy