Transformation Behavior of Trip Steels.
Abstract
Recent true-stress, true-strain measurements of the tensile flow properties of high-strength TRIP steels designed to incorporate the initial region of localized flow associated with Luders band formation have called attention to a large apparent strain-rate sensitivity of the uniform ductility. This apparent strain-rate effect was interpreted as originating from the temperature dependence of the kinetics of the deformation-induced martensitic transformation which controls the work-hardening behavior of these metastable austenitic steels. Efforts to understand the transformation kinetics and its relation to flow properties in high-strength TRIP steels have been hampered by a lack of experimental information from the region of initial inhomogeneous flow that represents such an important part of the deformation behavior of these materials. The present study was undertaken to extend true-stress, true-strain, and volume fraction martensite measurements to the region of Luders band formation in order to elucidate the transformation kinetics and its relation to flow properties as a function of temperature, and to compare these findings with the behavior of lower strength metastable austenites which deform homogeneously and for which theoretical concepts are fairly well developed. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1977
- Accession Number
- ADA049143
Entities
People
- Gregory B. Olson
- Morris Azrin
Organizations
- United States Army Research Laboratory