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| Effect of Carbon Content on Microstructure and Mechanical Properties of New Fe-Ni-Mn-Si-C TWIP Steel |
| WEN Hong-Ying |
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Abstract Microstructures and tensile properties of new high carbon Fe-Ni-Mn-Si-C steels were investigated by optical microscope, X-ray diffraction and TEM. The results show that twinning induced plasticity effect is the main plasticity mechanism of the Fe-Ni-Mn-Si-C steels. With the increasing of carbon content, yield strength increases from 391 MPa to 458 MPa, tensile strength increases from 860 MPa to 974 MPa, and elongation increases from 63.6% to 69.2%. The serrated flow on the stress-strain curve becomes more obvious with the increasing of the carbon content. Fe-15Ni-12Mn-2.5Si-XC steels have high strain hardening capacity, and the maximal strain hardening exponent of the steels can reach up to 0.73 when the carbon content increases to 0.98%.
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Received: 14 October 2009
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2010, Vol. 45 
