Journal
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
Volume 16, Issue 2, Pages 154-158Publisher
SPRINGER
DOI: 10.1016/S1674-4799(09)60026-1
Keywords
annealing temperature; TWIP steel; annealing twins; mechanical twins
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Funding
- National Natural Science Foundation of China [50575022]
- Specialized Research Foundation for the Doctoral Program of Higher Education of China [20040008024]
- National High-Tech Research and Development Program of China [2008AA03E502]
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Microstructures and mechanical properties of the 25Mn twinning induced plasticity (TWIP) steel at different annealing temperatures were investigated. The results indicated that when the annealing temperature was 1000 degrees C, the 25Mn steel showed excellent comprehensive mechanical properties, the tensile strength was about 640 MPa, the yield strength was higher than 255 MPa, and the elongation was above 82%. The microstructure was analyzed by optical microscopy (OM), X-ray diffraction (XRD), and transmission electron microscopy (TEM). Before deformation the microstructure was composed of austenitic matrix and annealing twins at room temperature; at the same time, a significant amount of annealing twins and stacking faults were observed by TEM. Mechanical twins played a dominant role in deformation and as a result the mechanical properties were found to be excellent.
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