Influence of nitrogen alloying on hydrogen embrittlement in AISI 304-type stainless steels

Journal Article · Sat Dec 01 04:00:00 EST 1984 · Metall. Trans., A; (United States)

DOI:https://doi.org/10.1007/BF02647103· OSTI ID:6088240

Hannula, S -P; Hanninen, H; Tahtinen, S

Hydrogen embrittlement of AISI 304-type austenitic stainless steels has been studied with special emphasis on the effects of the nitrogen content of the steels. Hydrogen charging was found to degrade the mechanical properties of all the steels studied, as measured by a tensile test. The fracture surfaces of hydrogen charged specimens were brittle cleavage-like whereas the uncharged specimens showed ductile, dimpled fracture. In sensitized materials transgranular cleavage mode of fracture was replaced by an intergranular mode of fracture and the losses of mechanical properties were higher. Nitrogen alloying decreased the hydrogen-induced losses of mechanical properties by increasing the stabilit of austenite. In sensitized steels the stability of austenite and nitrogen content were found to have only a minor effect on hydrogen embrittlement, except when sensitization had caused ..cap alpha..'-martensite transformation at the grain boundaries.

• Research Organization: Department of Materials Science and Engineering, Cornell University, Ithaca, NY.
• OSTI ID: 6088240
• Journal Information: Metall. Trans., A; (United States), Journal Name: Metall. Trans., A; (United States) Vol. 15 A:12; ISSN MTTAB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
360102 -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
AUSTENITE
CARBON ADDITIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
ELEMENTS
EMBRITTLEMENT
FRACTURE MECHANICS
GRAIN BOUNDARIES
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HYDROGEN EMBRITTLEMENT
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MECHANICAL PROPERTIES
MECHANICS
METALLURGICAL EFFECTS
MICROSTRUCTURE
NICKEL ALLOYS
NITROGEN
NONMETALS
PHASE TRANSFORMATIONS
STAINLESS STEEL-304
STAINLESS STEELS
STEELS