MECHANICAL PROPERTIES OF CARBURIZED AUSTENITIC STAINLESS STEELS AS RELATED TO MICROSTRUCTURE.
Rept. for 1 Jul-31 Dec 68,
AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS
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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
- Properties of Metals and Alloys
- Solid State Physics