Effect of Dissolved and Precipitated Niobium in Microalloyed Steel on Deformation Induced Ferrite Transformation （DIFT）

Hot deformation processing was designed to study the effects of niobium （Nb） on DIFT. A prestrain of 0.51 at 880 ℃ for different isothermal time was used for adjusting the deformed austenite constitution and Nb existing state, followed by a secondary heavy deformation at 780 ℃ for inducing the ferri...

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Bibliographic Details
Published inJournal of iron and steel research, international Vol. 16; no. 4; pp. 67 - 71
Main Author LIU Qing-you DENG Su-huai SUN Xin-jun DONG Han WENG Yu-qing
Format Journal Article
LanguageEnglish
Published 2009
Subjects
变形加工
变形奥氏体
形变诱导铁素体相变
微合金钢
等温时间
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Summary:Hot deformation processing was designed to study the effects of niobium （Nb） on DIFT. A prestrain of 0.51 at 880 ℃ for different isothermal time was used for adjusting the deformed austenite constitution and Nb existing state, followed by a secondary heavy deformation at 780 ℃ for inducing the ferrite transformation. The volume fraction and grain size of deformation induced ferrite （DIF） obtained at different isothermal time between double hits were investigated. It was found that Nb dissolved in austenite is adverse to DIFT; however, the precipitation of Nb is beneficial to DIFT. As Nb plays the role in the conventional TMCP, Nb retards the recrystallization of deformed austenite and enhances the deformation stored energy in the multipass deformation, and in result, Nb promotes DIFT.
Bibliography:precipitation
11-3678/TF
recrystallization
niobium
deformation induced ferrite transformation
TG156.93
TG142.33
niobium; precipitation; recrystallization; deformation induced ferrite transformation
ISSN:1006-706X
2210-3988