Journal of Northeastern University Natural Science ›› 2016, Vol. 37 ›› Issue (1): 44-48.DOI: 10.12068/j.issn.1005-3026.2016.01.010

• Materials & Metallurgy • Previous Articles     Next Articles

Precipitation Behavior of Ultra-pure Ferritic Stainless Steel During Hot Deformation

GAO Fei1, LIU Zhen-yu2, YU Fu-xiao1   

  1. 1. School of Materials & Metallurgy, Northeastern University, Shenyang 110819, China; 2. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China.
  • Received:2014-11-26 Revised:2014-11-26 Online:2016-01-15 Published:2016-01-08
  • Contact: GAO Fei
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Abstract: The precipitation behavior of an ultra-pure medium-chromium ferritic stainless steel with addition of Ti and V during hot deformation was studied using a thermomechanical simulator and pilot rolling mill. The characteristic of precipitates was investigated using thermodynamic calculation and transmission electron microscopy. The results showed that TiC is primary precipitate formed during hot deformation, in agreement with the thermodynamic calculation. The characteristic of these precipitates is closely dependent on deformation temperature. The TiC formed during hot deformation at relatively low temperature is finer in size and denser in dispersion than that at high temperature. This can be explained by a combination of the slower diffusion rate associated with the lower deformation temperature which is unfavorable to precipitate growth, and increasing lattice defects due to lower deformation temperature which can generate more nucleation sites for the strain-induced precipitates. This precipitation behavior during hot deformation is confirmed by the pilot rolling experiments.

Key words: ferritic stainless steel, hot deformation, precipitation behavior, thermodynamic calculation, transmission electron microscopy

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