Improvement in toughness of Fe-Cr-Mn-C steels by thermal-mechanical treatments |
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Authors: | R Ramesh N J Kim G Thomas |
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Affiliation: | (1) Pohang, Korea;(2) Bellcore, 07701 Red Bank, NJ;(3) Department of Materials Science and Mineral Engineering, University of California at Berkeley, Materials and Chemical Sciences Division, Lawrence Berkeley Laboratory, 94720 Berkeley, CA |
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Abstract: | High-Cr (about 10 wt pct) Fe-Cr-Mn-C microcomposite lath martensite-austenite structural steels have been developed in order
to achieve high strength and high toughness for applications in corrosive environments. Processing by controlled hot rolling
and air cooling produces a finegrained alloy with excellent toughness. The alloys are air hardenable, and the microstructure
consists of lath martensite packets with retained austenite around the laths. The laths contain fine intralath autotempered
carbides. The mechanical properties of the steel so produced are found to be superior to those treated by conventional methods
of single or cyclic austenitization treatment. Optical metallography, transmission electron microscopy and scanning electron
microscopy (SEM) have been used to characterize the effect of various process variables on the mechanical properties.
R. RAMESH and N.J. KIM, formerly with the Department of Materials Science and Mineral Engineering, University of California
at Berkeley |
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