A Stem Analysis of Two Rapidly Solidified Stainless Steels.
Abstract
Scanning transmission electron microscopy (STEM) has been used for microstructural and microchemical analysis of two rapidly solidified austenitic stainless steels. One steel is a high-sulfur, 303 stainless type. In this rapidly solidified steel, sulfide particles (MnS) are found to be two or three orders of magnitude smaller in size, and more uniformly distributed, than in the conventionally processed material. Extremely small sulfide particles have been observed at the cell walls and in the intracellular region of the solidification structure of individual rapidly solidified powder particles. Moreover, composition profiles have been obtained by the STEM across regular and nonregular cell walls in these powders which indicate that a high degree of chemical homogeneity has obtained. A comparison is made of the microstructures and microchemistry of individual powders, consolidated powder product, and conventionally processed versions of this high-sulfur austenitic stainless steel. The rapidly solidified powders of a high-phosphorus stainless steel have also been observed in STEM. The results of these observations are presented in light of the data obtained on the high-sulfur steel. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 25, 1980
- Accession Number
- ADA085887
Entities
People
- J. B. Vander Sande
- T. F. Kelly
Organizations
- Massachusetts Institute of Technology