Actions for Moessbauer study of austenite stability and impact fracture in Fe--6Ni steel [electronic resource].

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Moessbauer study of austenite stability and impact fracture in Fe--6Ni steel [electronic resource].

Published
Berkeley, Calif. : University of California, Berkeley, 1978.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: 65 : digital, PDF file
Additional Creators
University of California, Berkeley and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The two phase (..cap alpha.. + ..gamma..) microstructure of a commercial cryogenic alloy steel was studied with regard to possible phase transformations induced by impact fracture. A backscatter Moessbauer spectrometer was constructed for measurements of atomic fractions of the two phases near specimen surfaces. Moessbauer spectra were collected from several types of unpolished and chemically polished surfaces of impact specimens to reveal (for the first time) the depth profile of the observed ..gamma.. ..-->.. ..cap alpha..' transformation near fracture surfaces. It was found that the spatial extent of transformation could be monotonically related to the impact energy absorbed by the specimen. These results are interpreted in light of several models of phase stability and impact toughness. A general description of the Moessbauer effect and methods of spectral analysis is included. The method of linear perturbations in the hyperfine magnetic field is discussed with respect to its general usefulness in obtaining chemical information for Moessbauer spectra of the ..cap alpha.. phase. The procedure adopted for spectral analysis was chosen to provide an accurate phase analysis at the expense of chemical information. Both the Moessbauer equipment and analysis procedures were developed with the primary objective of providing a routine metallurgical phase analysis technique for low alloy steels.
Report Numbers
E 1.99:lbl-7671
lbl-7671
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Note
Published through SciTech Connect.
06/01/1978.
"lbl-7671"
Fultz, B.T.
Funding Information
W-7405-ENG-48
View MARC record | catkey: 14462074