Role of hydrogen in the ductile fracture of plain carbon steels

Journal Article · Thu Mar 01 04:00:00 EST 1979 · Metall. Trans., A; (United States)

DOI:https://doi.org/10.1007/BF02658347· OSTI ID:6431374

Cialone, H; Asaro, R J

The problem of hydrogen induced ductility losses in a plain carbon spheroidized steel is considered. Specifically, the effect of internal hydrogen on the formation of voids from second phase (cementite) particles and their subsequent growth and coalescence was studied by careful microscopic inspection of uniaxially strained bars, both initially cylindrical and circumferentially notched, with and without hydrogen. Void initiation occurred with lower strains and stresses with hydrogen, although an equally important contribution to the ductility loss was from hydrogen accelerated void growth and coalescence. This latter process takes place by the propagation of voids along the grain, and possibly subgrain, boundaries which interlink the cementite spheroids. The results indicate that hydrogen facilitates interface separation, possibly by accumulating at the boundaries during hydrogenation of the specimen and lowering the cohesive strength, there by making void initiation and growth along them easier.

• Research Organization: Brown Univ., Providenc, RI
• OSTI ID: 6431374
• Journal Information: Metall. Trans., A; (United States), Journal Name: Metall. Trans., A; (United States) Vol. 10:3; ISSN MTTAB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
CARBON STEELS
CRACKS
CRYOGENIC FLUIDS
CRYSTAL STRUCTURE
DENSITY
DUCTILITY
ELEMENTS
FAILURES
FLUIDS
FRACTURES
GRAIN SIZE
HYDROGEN
IRON ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
MICROSTRUCTURE
NONMETALS
PHYSICAL PROPERTIES
SIZE
STEELS
TENSILE PROPERTIES
VOIDS