Early Stages of Aging and Tempering of Iron-Carbon Martensites.
Abstract
The early stages of aging/tempering of iron-carbon martensites have been studied over a wide range of carbon contents by numerous experimental techniques. A kinetic framework is presented which allows a correlation of many diverse observations. Three general regimes of structural change termed relaxation, aging, and tempering can be further subdivided, thus identifying two stages of aging (A1 and A2) which precede the conventional stages of tempering (T1-T3). The first stage of aging involves clustering of carbon atoms in c-oriented octahedral sites, while the second stage is associated with a modulated tweed microstructure containing high-carbon regions which may be interpreted as either advanced carbon clusters or coherent transition carbides. Standard alloy compositions are proposed for further research to permit a more precise correlation of the diverse experimental observations required to interpret these unusual structures more completely. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1982
- Accession Number
- ADA111380
Entities
People
- G. B. Olson
- Morris B Cohen
Organizations
- Massachusetts Institute of Technology