Accession Number:

AD0692514

Title:

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

Descriptive Note:

Rept. for 1 Jul-31 Dec 68,

Corporate Author:

AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS

Personal Author(s):

Report Date:

1969-07-31

Pagination or Media Count:

31.0

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.Cr7C3 and austenite, and 2 a heavily carburized grain boundary area, also Fe.Cr7C3, 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

Subject Categories:

  • Properties of Metals and Alloys
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE