The mechanical stability of precipitated austenite in 9Ni steel |
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| Authors: | B Fultz J W Morris |
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| Affiliation: | (1) Keck Laboratory, California Institute of Technology, 91125 Pasadena, CA;(2) Department of Materials Science and Mineral Engineering, University of California, Berkeley;(3) Lawrence Berkeley Laboratory, University of California, 94720 Berkeley, CA |
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| Abstract: | The strains inherent to the martensitic transformation of austenite particles in 9Ni steel create dislocation structures in
the tempered martensite. These dislocation structures were studied by the complementary techniques of X-ray line profile analysis
and transmission electron microscopy. The energy required to form these dislocation structures affects the thermodynamics
of the transformation. We propose that changes in these dislocation structures reduce the “mechanical stability” of the austenite
particles as they grow larger during isothermal tempering. |
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