Physics
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aemr.book.....s&link_type=abstract
Unknown
Physics
1
Acoustic Emission, Fracturing, Microstructure, Steels, Tempering, Tensile Tests, Carbon, Dislocations (Materials), Models, Precipitation Hardening, Quenching (Cooling), Shear Stress
Scientific paper
Tempering of Fe-3.25 wt%Ni alloys with carbon contents of between 0.057 and 0.49 wt% leads to a pronounced acoustic emission activity during ambient temperature tensile testing. The maximum emission occurs from samples tempered approx. 250 deg C and appears only weakly influenced by carbon content. Mechanical property determinations link the maximum to a precipitation hardening effect. A model involving the cooperative motion of dislocations over distances corresponding to the lath-packet dimension is proposed. The mechanism responsible for cooperative motion is believed to be a precipitate shearing process, the first time such a process has been proposed for quenched and tempered ferritic steels. A second, much weaker source of emission has been identified in material subjected to prolonged tempering at 625 deg C. The mechanism responsible for this emission is believed to be the sudden multiplication and propagation of dislocations during microyield events. No evidence has been found to support the view that carbide fracture in quenched and tempered steels is a direct source of acoustic emission. The microstructural states in which most quenched and tempered steels are used in practice, generate very little detectable acoustic emission either during deformation or fracture, irrespective of carbon content.
Scruby C. B.
Wadley N. G. H.
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