期刊
STEEL RESEARCH INTERNATIONAL
卷 83, 期 4, 页码 316-321出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/srin.201100317
关键词
medium-Mn steel; ultrafine grain size; ART-annealing; duplex structure; work hardening behavior; dynamic composite
资金
- National Basic Research Program of China (973 program) [2010CB630803]
- National High-tech R&D Programs (863 programs) [2009AA03Z519, 2009AA033401]
The ultrafine grained duplex steels were fabricated by austenite reverted transformation annealing of the medium manganese steels after quenching or cold rolling. The microstructures were examined by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) and X-ray diffraction (XRD). The mechanical properties were determined by uniaxial tensile test. It was demonstrated that both the quenched and cold rolled structures were transformed into ultrafine grained duplex structures with large fractioned austenite by ART-annealing. Long time annealing is essential to obtain the large fractioned austenite in quenched steel, but only short time annealing is needed to get large fractioned austenite in the cold rolled sheet. The mechanical examinations indicated that ART-annealing results in the superhigh tensile elongation (>40%) and superhigh strength (1000?MPa) in quenched steels after long time annealing but in cold rolled steels after short time annealing. Based on the analysis on the work hardening behaviors of these ART-annealed steels, the abnormal work hardening rate was presented and analyzed. The substantially enhanced ductility was attributed to the Luders band propagation of the ferrite matrix and/or the TRIP effects of the large fractioned austenite. At last the dynamic phase natures of both fraction and stress was proposed to interpret the abnormal hardening behaviors and the S shaped stressstrain curves.
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