东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2014, Vol. 35 ›› Issue (8): 1120-1123.DOI: 10.12068/j.issn.1005-3026.2014.08.013

• 材料与冶金 • 上一篇    下一篇

卷取温度对热轧F/B双相钢组织性能的影响

沈鑫珺1，裴新华1,2，唐帅1，王国栋1   

  1. (1 东北大学 轧制技术及连轧自动化国家重点实验室， 辽宁 沈阳110819; 2 上海梅山钢铁公司 技术中心， 江苏 南京210039)
  • 收稿日期:2013-12-16 修回日期:2013-12-16 出版日期:2014-08-15 发布日期:2014-04-11
  • 通讯作者: 沈鑫珺
  • 作者简介:沈鑫珺(1989-)，男，安徽六安人，东北大学博士研究生；王国栋(1942-)，男，辽宁大连人，东北大学教授，博士生导师，中国工程院院士.
  • 基金资助:
    中央高校基本科研业务费专项资金资助目(N120807001)；国家自然科学基金资助项目(51204049).

Effects of Coiling Temperature on Microstructure and Mechanical Properties of HotRolled Ferrite/Bainite Dual Phase Steel〓

SHEN Xinjun1， PEI Xinhua1,2， TANG Shuai1， WANG Guodong1   

  1. 1 State Key Laboratory of Rolling and Automation， Northeastern University， Shenyang 110819， China; 2 Technology Center of Baosteel Meishan Corporation， Nanjing 210039， China.
  • Received:2013-12-16 Revised:2013-12-16 Online:2014-08-15 Published:2014-04-11
  • Contact: TANG Shuai
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摘要： 采用轧后空冷+超快速冷却工艺，研究卷取温度对热轧铁素体/贝氏体(F/B)双相钢组织性能的影响规律.结果表明:卷取温度由504℃降至250℃时，铁素体体积分数变化很小(857%～878%)，铁素体晶粒尺寸变化也很小(36～37μm)，组织中的硬相由以贝氏体为主转变为以马氏体为主；实验钢的抗拉强度由510MPa升至597MPa，屈服强度由475MPa降至389MPa，延伸率变化较小(322%～350%).另外，随着卷取温度的降低，铁素体与贝氏体或马氏体间的变形协调能力降低，使扩孔过程中微孔提前形核，同时加快了已有微孔的长大及合并过程，导致试样发生的塑性变形减小，扩孔性能降低，扩孔率由1014%降至524%.

关键词: 热轧F/B双相钢, 新一代控制轧制和控制冷却, 超快速冷却, 卷取温度, 组织演变, 力学性能, 扩孔性能

Abstract: The process of aircooling followed by ultra fast cooling after hotrolling was used to investigate the effects of coiling temperature on the microstructure and mechanical properties of a ferrite/bainite (F/B) dual phase steel. The results show that the volume fraction and the grain size of ferrite are in the rage of 857%-878% and 36-37 μm， respectively， almost independent of the coiling temperature. Lowering coiling temperature from 504 ℃ to 250 ℃， the dominant hard phase was transformed from bainite to martensite， resulting in the ultimate strength up to 597 MPa from 510 MPa， the yield strength down to 389 MPa from 475 MPa， but the elongation without significant change (322%-350%). Besides， the deformation compatibility between ferrite and bainite or martensite is weakened with the decrease of the coiling temperature， which induces the nucleation in advance， accelerates growth and coalescence of microvoids， so the hole expansion property is deteriorated and the hole expansion ratio is reduced from 1014% to 524%.

Key words: hotrolled F/B dual phase steel, newgeneration thermomechanical control process (NGTMCP), ultra fast cooling, coiling temperature, microstructure evolution, mechanical property, hole expansion property

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