ISSN:1003-8620

CN:42-1243/TF

主管:中信泰富特钢集团股份有限公司

主办:大冶特殊钢有限公司

特殊钢 ›› 2017, Vol. 38 ›› Issue (2): 64-66.

• 组织和性能 • 上一篇    下一篇

高强度船板钢EH460的动态连续冷却转变曲线

李胜利1,2,孙傲1,孙逸婷1,周成2,严玲2   

  1. 1.辽宁科技大学材料与冶金学院,鞍山 114051;
    2. 鞍山钢铁集团技术中心,鞍山 114001;
  • 收稿日期:2016-10-29 出版日期:2017-04-01 发布日期:2022-07-23
  • 作者简介:李胜利(1967-),男,博士(2006年东北大学),教授,1988年鞍山钢铁学院(本科)毕业,冶炼和轧钢工艺研究。

Dynamic Continuous Cooling Transformation Curves of High Strength Hull Structural Steel EH460

Li Shengli1,2 , Sun Ao1 , Sun Yiting1 , Zhou Cheng2 , Yan Ling2
  

  1. 1. School of Materials and Metallurgy, Liaoning University of Science and Technology, Anshan 114051 ;
    2. Technology Center, Anshan Iron and Steel Group, Anshan 114001;
  • Received:2016-10-29 Published:2017-04-01 Online:2022-07-23

摘要: 通过Gleeble-3800热模机将EH460钢80 mm热轧板(/%:0.07C,0.39Si,1.76Mn,0.34Ni,0.36Cu,0.02~0.05Nb,0.05~0.10V,≤0.02Ti,0.008A1)切取的φ5 mm×86 mm试样以10℃/s加热至1200℃ 5 min奥氏体化,然后以10℃/s冷却至830℃,并在830℃以变形速率1 s-1,进行30%的热压缩变形试验,并以130℃/s冷却到室温。通过膨胀量-温度曲线,结合不同冷却速率下的组织,利用Qrigin软件得出EH460钢的动态连续冷却转变曲线。结果表明,当冷却速率小于3℃/s时,EH460钢的组织为铁素体+少量贝氏体;当冷却速率为5~10℃/s时,组织为贝氏体+少量铁素体;当冷却速率大于20℃/s时,组织以板条贝氏体为主,并含少量粒状贝氏体;当冷却速率从1℃/s增加至30℃/s时,该钢HV硬度值由246增加到274。

关键词: EH460船板钢, 相变, 冷却速率, CCT曲线

Abstract: The hot compression test on 4>5 mm x 86 mm test specimen cut from 80 mm hot-rolled plate of steel EH460 (/% : 0.07C, 0.39Si, 1.76Mn, 0.34Ni, 0.36Cu, 0.02〜0.05Nb, 0.05~0.10V, ≤0.02Ti, 0.008Als) with 10℃/s heating to 1200 ℃for 5 min austenizing then with 10°C/s cooling to 830 °C and with strain rate 1 s-1 , deformation 30% at 830°C,then cooling to ambient temperature with 1~30°C/s has been carried out by using a Gleeble-3800 thermal simulation testing machine. And the dynamic continuous cooling transfonnation (CCT) curves of tested steel EH460 is obtained by dilation-temperature curves combined with structure at different cooling rate and using Origin software. Results show that with cooling rate less than 3 °C/s the structure of steel EH460 is ferrite + minor bainite, with cooling rate 5~10°C/s the structure is bainite + minor ferrite and with cooling rate more than 20 °C/s the structure is mainly lath bainite with little granular bainite ; with cooling rate increasing from 1 °C/s to 30 °C/s the HV hardness value of the steel increases form 246 to 274.

Key words: Hull Structure Steel EH460, Phase Transformation, Cooling Rate, CCT Curves