XU Kun, LIU Guo-quan. Effect of Nb microalloying on the microstructure and mechanical properties of high-Al cold-rolled TRIP steel[J]. Chinese Journal of Engineering, 2009, 31(10): 1257-1262. DOI: 10.13374/j.issn1001-053x.2009.10.013
Citation: XU Kun, LIU Guo-quan. Effect of Nb microalloying on the microstructure and mechanical properties of high-Al cold-rolled TRIP steel[J]. Chinese Journal of Engineering, 2009, 31(10): 1257-1262. DOI: 10.13374/j.issn1001-053x.2009.10.013

Effect of Nb microalloying on the microstructure and mechanical properties of high-Al cold-rolled TRIP steel

  • The effects of 0.025% Nb microalloying on the microstructure and mechanical properties of high-Al cold-rolled TRIP steel were investigated by means of two-stage salt bath heat treatment,optical microscopy(OM),scanning electron microscopy(SEM),X-ray diffraction(XRD) and tensile test.The results indicate that the addition of Nb refines the microstructure after continuous annealing and increases the volume fraction and carbon content of retained austenite.The Nb-microalloyed high-Al TRIP steel treated at 370℃ or 400℃ has very excellent mechanical properties,the tensile strength is higher than 650 MPa and the total elongation is above 35%.The best isothermal bainitic transformation process of the Nb-alloyed TRIP steel is from 370℃ to 400℃,which is wider than that of the TRIP steel without Nb,at about 400℃.The consistency of the process is enhanced.
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