Journal of South China University of Technology(Natural Science Edition) ›› 2012, Vol. 40 ›› Issue (7): 128-134.

• Materials Science & Technology • Previous Articles     Next Articles

Effect of Controlled Rolling and Cooling Process on Carbonitride Precipitation from X120 Pipeline Steel

Zheng Hong-wei  Tang Di  Wu Hui-bin  Yang Liu   

  1. Engineering Research Institute,University of Science and Technology Beijing,Beijing 100083,China
  • Received:2012-02-16 Revised:2012-05-24 Online:2012-07-25 Published:2012-06-01
  • Contact: 武会宾(1977-) ，男，博士，副教授，主要从事高强低碳贝氏体钢研究． E-mail: huibinwu@163．com E-mail:hongwei.zh82@gmail.com
  • About author:郑宏伟(1982-) ，男，博士生，主要从事微合金高强钢研究．
  • Supported by:

    国家"863”计划项目( 2012AA03A508)

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Abstract:

This paper deals with the effects of such rolling parameters as the deformation in non-recrystallization region,the cooling rate and the final cooling temperature on the carbonitride precipitation from X120 pipeline steel in different controlled rolling and cooling processes,and theoretically estimates the strength contribution of precipitated phase based on the Orowan mechanism. The results show that the rolling process has no effect on the type and structure of the precipitated phase,that the increase of deformation in non-recrystallization region mainly promotes the precipitation of Nb and improves the yield strength of X120 pipeline steel,and that the cooling rate and the final cooling temperature have little influence on the precipitation of carbonitride.

Key words: controlled rolling process, controlled cooling process, X120 pipeline steel, carbonitride, precipitation, Orowan mechanism