The Composition of Precipitated Austenite in 5.5 Ni Steel.
Abstract
Both Scanning Transmission electron microscopic (STEM) and chemical extraction techniques were used to analyze the chemical content of precipitated austenite in 5.5 Ni steel as a function of heat treatment. Austenite was introduced into the steel by tempering at 600 degrees C for 2 hours (OT) or 100 hours (OT100), by tempering for 1 hour at 670 degrees C (OL), or by double tempering 1 hour at 670 degrees C + 1 hour at 600 degrees C (OLT). The two methods of chemical analysis employed for the analysis of this austenite differ quantitatively in the measured austenite composition but are in qualitative agreement: they show an austenite enrichment in Ni, Cr, Mn, and Mo which is most pronounced (and nearly equivalent) for the OT100 and OLT treatments. The similar enrichment of the OT100 and OLT material is interpreted in light of the sequence of reactions leading to the OLT structure. A good correlation is found between the apparent solute enrichment of the precipitated austenite and its thermal stability on cooling to 77 degrees K. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1980
- Accession Number
- ADA107572
Entities
People
- J. I. Kim
- J. W. Morris Jr.
Organizations
- University of California, Berkeley