Journal of Northeastern University Natural Science ›› 2019, Vol. 40 ›› Issue (12): 1707-1710.DOI: 10.12068/j.issn.1005-3026.2019.12.007

• Materials & Metallurgy • Previous Articles     Next Articles

Introducing Martensite to Reduce Yield Ratio of Steel Plates Rolled in Dual-Phase Region by Quenching

SHEN Xin-jun, LI De-zhi, TANG Shuai, WANG Guo-dong   

  1. The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China.
  • Received:2019-04-11 Revised:2019-04-11 Online:2019-12-15 Published:2019-12-12
  • Contact: SHEN Xin-jun
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Abstract: Grain refinement and delamination toughening can endow high strength and superior toughness to laminated and ultrafine-grained steel plates rolled in the dual-phase region. The previous study indicated that the laminated and ultrafine-grained steel plates possessed a high yield ratio up to 0.9 when air cooling was applied after rolling. In the present study, martensite was introduced to the laminated and ultrafine-grained steel plates by quenching after rolling to reduce the yield ratio. We found that martensite with a volume fraction of ~14% was generated by quenching followed by rolling at 750℃ or 810℃. Continuous yielding behavior was present during tensile testing due to the existence of martensite, and high work hardening rate was obtained. As expected, the reduced yield ratio lower than 0.7 was realized so that the problem that yield ratio was too high was solved for the laminated and ultrafine-grained steel plates. Moreover, high strength and good toughness were acquired.

Key words: rolling in the dual-phase region, laminated and ultrafine-grained microstructure, yield ratio, martensite, work hardening rate

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