Abstract
Constitutive relations for transformation plasticity have been derived from martensitic transformation kinetic theory, predicting flow-stress as a function of strain, strain-rate, temperature, and stress state. The stress-strain curve can exhibit upward curvature under the combined influence of the softening contribution of the transformation as a deformation mechanism and the hardening contribution of the transformation product. This shape provides a maximum stability of plastic flow and quantitatively accounts for observed enhancement of uniform ductility in TRIP steels. In combination with transformation dilatation effects, the flow stabilizing influence also accounts for a major transformation toughening effect observed when ductile fracture is controlled by plastic shear instability. The principles have now been applied to both homogeneous and dispersed-phase alloy systems.
| Original language | English (US) |
|---|---|
| Title of host publication | Unknown Host Publication Title |
| Publisher | Metallurgical Soc of AIME |
| Pages | 367-390 |
| Number of pages | 24 |
| ISBN (Print) | 0373390121 |
| State | Published - 1986 |
ASJC Scopus subject areas
- General Engineering