Superposition of alloy hardening, strain hardening, and dynamic recovery
Conference
·
OSTI ID:5620559
The principles and heuristics of flow stress superposition are illustrated for the case that one of the components is due to dislocation/dislocation interactions and is the only one that changes with strain. A simultaneous investigation of the flow stress and its rate sensitivity as a function of strain then allows one to confirm or refute postulated superposition laws and, in addition, to separate the effects of alloying or heat treatment on yield stress and on strain hardening. The slope of the observed stress strain curve depends on the form of the superposition law even if there is no physical influence of alloying on the dislocation storage rate; the frequently observed low initial strain hardening associated with a higher yield stress may in some cases be merely a consequence of a nonlinear superposition. At higher strains, the influence of alloying on dynamic recovery becomes the predominant effect; it also controls the high-temperature creep strength. When dynamic recovery plays an important role, it provides a further straining mechanism which, however, is not additive to the low-temperature strain rate; a form of the superposition law for long-range slip and this dynamic recovery strain is proposed. An application of these principles has demonstrated that dynamic strain aging is due to an effect of mobile solute atoms on the strain-hardening component of the flow stress, not on the friction stress.
- Research Organization:
- Argonne National Lab., IL (USA)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 5620559
- Report Number(s):
- CONF-790801--6
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360101 -- Metals & Alloys-- Preparation & Fabrication
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
CHROMIUM ALLOYS
CONFIGURATION
CONTROL
CREEP
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISLOCATIONS
DISPERSION HARDENING
HARDENING
HEAT TREATMENTS
INCONEL 600
INCONEL ALLOYS
INCONEL X750
IRON ALLOYS
LINE DEFECTS
MECHANICAL PROPERTIES
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM ALLOYS
PRECIPITATION HARDENING
RECOVERY
SHAPE
STRAIN HARDENING
STRAINS
STRESSES
TITANIUM ALLOYS
360101 -- Metals & Alloys-- Preparation & Fabrication
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
CHROMIUM ALLOYS
CONFIGURATION
CONTROL
CREEP
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISLOCATIONS
DISPERSION HARDENING
HARDENING
HEAT TREATMENTS
INCONEL 600
INCONEL ALLOYS
INCONEL X750
IRON ALLOYS
LINE DEFECTS
MECHANICAL PROPERTIES
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM ALLOYS
PRECIPITATION HARDENING
RECOVERY
SHAPE
STRAIN HARDENING
STRAINS
STRESSES
TITANIUM ALLOYS