Journal of Northeastern University:Natural Science ›› 2013, Vol. 34 ›› Issue (1): 66-70.DOI: -

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Effects of Nb and Final Quenching on Microstructure and Mechanical Property of Q&P Steels

ZHANG Jun, DING Hua, TANG Zheng-you, LI Mao   

  1. School of Materials & Metallurgy, Northeastern University, Shenyang 110819, China.
  • Received:2012-07-10 Revised:2012-07-10 Online:2013-01-15 Published:2013-01-26
  • Contact: ZHANG Jun
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Abstract: Two kinds of steels 0.19C-1.52Si-1.53Mn-0.14Al-0.048Nb and 0.19C-1.52Si-1.48Mn-0.15Al were treated by Q& P (quenching and partitioning) process. The effect of final quenching on the microstructure and mechanical property of Q& P steels was studied. The results showed that the addition of Nb has the effect of fine grain strengthening and precipitation strengthening. The combination of elongation and tensile strength achieves 25190MPa·%. And the final quenching process increases the volume of martensite and greatly improves the tensile strength and yield strength of Q& P steels. Meanwhile, this process decreases the total elongation and work hardening index of the steels. The steels without final quenching process have the better mechanical properties with high total elongation but the relatively low strength.

Key words: Q& P process, final quenching, mechanical property, microstructure

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