HVEM studies of the effects of hydrogen on the deformation and fracture of AISI type 316 austenitic stainless steel

Journal Article · Mon Jan 01 00:00:00 EST 1990 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(90)90070-W· OSTI ID:6907125

Rozenak, P; Robertson, I M; Birnbaum, H K ^[1]

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1. Univ. of Illinois, Urbana (United States)

The mechanisms of hydrogen embrittlement in AISI type 316 austenitic stainless steel have been investigated by in situ straining in a high-voltage electron microscope (HVEM) equipped with an environmental cell. Hydrogen effects on strain-induced phase transformations, the generation rate and velocity of dislocations, and crack propagation rates were studied. The salient features of the fracture were similar for cracks propagating in vacuum and in hydrogen gas. In each case, [epsilon] and [alpha][prime] martensite formed at the crack; the [epsilon] phase extended ahead of the crack while the [alpha][prime] phase was restricted to high stress regions near the crack tip. The principal effect of hydrogen was to decrease the stress required for dislocation motion, for phase transformation of the austenite, and for crack propagation.

• DOE Contract Number: AC02-76ER01198
• OSTI ID: 6907125
• Journal Information: Acta Metallurgica et Materialia; (United States), Vol. 38:11; ISSN 0956-7151
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
STAINLESS STEEL-316
HYDROGEN EMBRITTLEMENT
CRACK PROPAGATION
DEFORMATION
DISLOCATIONS
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
PHASE TRANSFORMATIONS
ALLOYS
AUSTENITIC STEELS
CHROMIUM ALLOYS
CHROMIUM-NICKEL STEELS
CHROMIUM-NICKEL-MOLYBDENUM STEELS
CORROSION RESISTANT ALLOYS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DATA
EMBRITTLEMENT
HEAT RESIS
HIGH ALLOY STEELS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
LINE DEFECTS
MICROSCOPY
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NUMERICAL DATA
STAINLESS STEELS
STEEL-CR17NI12MO3
STEELS
360103* - Metals & Alloys- Mechanical Properties