期刊
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
卷 42A, 期 12, 页码 3691-3702出版社
SPRINGER
DOI: 10.1007/s11661-011-0687-y
关键词
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资金
- National Science Foundation [CMMI-0729114]
- Advanced Steel Processing and Products Research Center, an industry/university cooperative research center at the Colorado School of Mines
- Office of Basic Energy Sciences (DOE)
- DOE [DE AC5206NA25396]
Manganese enrichment of austenite during prolonged intercritical annealing was used to produce a family of transformation-induced plasticity (TRIP) steels with varying retained austenite contents. Cold-rolled 0.1C-7.1Mn steel was annealed at incremental temperatures between 848 K and 948 K (575 degrees C and 675 degrees C) for 1 week to enrich austenite in manganese. The resulting microstructures are comprised of varying fractions of intercritical ferrite, martensite, and retained austenite. Tensile behavior is dependent on annealing temperature and ranged from a low strain-hardening flat curve to high strength and ductility conditions that display positive strain hardening over a range of strain levels. The mechanical stability of austenite was measured using in-situ neutron diffraction and was shown to depend significantly on annealing temperature. Variations in austenite stability between annealing conditions help explain the observed strain hardening behaviors.
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