Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1573151 | Materials Science and Engineering: A | 2016 | 7 Pages |
Abstract
The mechanical stability and transformation behavior of both film and blocky retained austenite (RA) in a quenching and partitioning steel are investigated at 293Â K, 423Â K and 573Â K with X-ray diffraction measurements and transmission electron microscopy. Blocky RA both completely and incompletely transforms to twinned martensite during deformation at 293Â K and 423Â K, respectively, and completely transforms to lath martensite during deformation at 573Â K. At 293Â K and 423Â K, only the film RA with widths larger than ~70Â nm transforms to twinned martensite. However, film RA incompletely transforms to lath martensite at 573Â K. Hence, RA transformation is non-monotonic with temperature. Significant carbide formation at 573Â K, and therefore less carbon to stabilize RA, overcomes the increase in austenite stability due to the decrease in the temperature-dependent chemical driving force for the martensite transformation.
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Physical Sciences and Engineering
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Authors
Junying Min, Louis G. Jr., Ling Zhang, Jianping Lin, John E. Carsley, Li Sun,