华南理工大学学报(自然科学版) ›› 2016, Vol. 44 ›› Issue (2): 133-139.doi: 10.3969/j.issn.1000-565X.2016.02.019

• 材料科学与技术 • 上一篇    下一篇

析出相对Nb-V-Ti 微合金钢显微组织和性能的影响

庞启航 唐荻 赵征志 徐梅   

  1. 北京科技大学 冶金工程研究院,北京 100083
  • 收稿日期:2015-08-24 修回日期:2015-10-26 出版日期:2016-02-25 发布日期:2016-01-04
  • 通信作者: 庞启航(1986-) ,男,博士生,主要从事先进超高强钢开发与研究. E-mail:qihang25@gmail.com
  • 作者简介:庞启航(1986-) ,男,博士生,主要从事先进超高强钢开发与研究.
  • 基金资助:
    国家自然科学基金资助项目( 51371032)

Effect of Precipitation Phase on Microstructure and Properties of Nb-V-Ti Micro-Alloyed Steel

PANG Qi-hang TANG Di ZHAO Zheng-zhi XU Mei   

  1. Engineering Research Institute,University of Science and Technology Beijing,Beijing 100083,China
  • Received:2015-08-24 Revised:2015-10-26 Online:2016-02-25 Published:2016-01-04
  • Contact: 庞启航(1986-) ,男,博士生,主要从事先进超高强钢开发与研究. E-mail:qihang25@gmail.com
  • About author:庞启航(1986-) ,男,博士生,主要从事先进超高强钢开发与研究.
  • Supported by:
    Supported by the National Natural Science Foundation of China( 51371032)

摘要: 利用扫描电子显微镜( SEM) 和透射电子显微镜( TEM) 等仪器研究了不同Nb-V-Ti比例的微合金钢的显微组织与性能,重点研究了复合析出粒子的形貌和形成机理,并探讨了其对组织性能的影响. 结果表明: 在含0. 15%Ti 的试验钢中,同时添加少量Nb 和V 可以明显改善试验钢的塑性和韧性,其强度达到1 200 MPa 级时,断后伸长率和- 20℃冲击功分别为13%和102 J; 复合析出相大致可以分成晶粒尺寸约为100 nm 的大颗粒和晶粒尺寸约为35 ~ 50nm 的独立复合析出的( Nb,V,Ti) C 两类,实验表明后者具有更好的析出强化效果.

关键词: 复相钢, 微观组织, 复合析出相, 析出强化

Abstract: This paper deals with the microstructure and properties of Nb-V-Ti micro-alloyed steels with different Nb,V and Ti contents by means of SEM and TEM.It mainly investigates the morphology and formation mechanism of the diphase precipitate and explores the effect of diphase precipitate on the microstructure and properties of the steels.The results show that the simultaneous addition of Nb and V with a small dosage may remarkably improve the ductility and toughness of the steel with 0. 15% Ti; and that,when the tensile strength is 1200MPa,the percentage elongation after fracture achieves 13% and the impact energy achieves 102 J at - 20℃.Two types of Nb- V-Ti particles in the diphase precipitate are revealed.One is the large particle with a grain size of about 100nm and the other is the ( Nb,V,Ti) C particle with a grain size of about 35 ~ 50nm.It is found that the latter is of stronger precipitation strengthening ability.

Key words: multiphase steel, microstructure, diphase precipitate, precipitation strengthening

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