Journal of Northeastern University Natural Science ›› 2014, Vol. 35 ›› Issue (3): 375-378.DOI: 10.12068/j.issn.1005-3026.2014.03.016

• Materials & Metallurgy • Previous Articles     Next Articles

Effects of OverAging Temperatures on Microstructure and Mechanical Properties of Low Cost Cold Rolled Dual Phase Steels

LIU Jiyuan, LUO Zongan, SHI Minghao, ZHU Fuxian   

  1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China.
  • Received:2013-03-18 Revised:2013-03-18 Online:2014-03-15 Published:2013-11-22
  • Contact: LUO Zongan
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Abstract: A high strength and ductility dual phase steel was developed from the traditional steel via establishing reasonable processing parameter windows, which transferred from low to high additional values. The continuous annealing specimen was prepared from CMn steels by hot and cold rolling. The microstructure contained ferrite and martensite was obtained by the intercritical anneal, controlled cooling and the subsequent different overaging procedures. The bainite transformation was avoided when the overaging temperature was lower than 320℃. The volume fraction of the martensite increased with the decrease of temperatures. The tensile strength was proportional to the volume fraction of the martensites, whereas the yield strength and elongation performanced an inverse relationship. The strengthductility balance was 182546 MPa% in the 320℃ overaging procedure as a better mechanical property.

Key words: dual phase steels, low cost, continuous anneal, overaging temperature, microstructure and mechanical properties

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