Acta Metall Sin  2005, Vol. 41 Issue (11): 1127-1135     DOI:

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Investigation on deformation induced ferrite (a kind of martensite) transformation above Ae3 temperature in a low carbon steel

LIU Zhaoxia; LI Dianzhong; QIAO Guiwen

Institute of Metal Research; The Chinese Academy of Sciences

LIU Zhaoxia; LI Dianzhong; QIAO Guiwen. Investigation on deformation induced ferrite (a kind of martensite) transformation above Ae3 temperature in a low carbon steel. Acta Metall Sin, 2005, 41(11): 1127-1135 .

Abstract References Related Articles Recommended Metrics Download:  PDF(1144KB)  Export:  BibTeX | EndNote (RIS)       Abstract  A series of unidirectional compression tests of a low carbon steel Q235 were performed on a Gleeble 3500 thermal simulator,and the influences of strain, strain rate and deformation temperature (above the isothermal transformation temperature Ae3 from austenite to ferrite) on deformation induced ferrite transformation (DIFT) have been examined. The microstructure, nanoindentation hardness and the elastic modulus of deformation induced ferrite (DIF) and proeutectoid ferrtie were determined by optical microscope, scanning electron microscope (SEM), X-ray diffraction (XRD) and nanoindentation techniques. The results show that DIFT can take place above Ae3 temperature, the higher the strain rate and the strain, the more favorable for DIFT. When ε=80% and ε=20 s-1, the upper limit temperature of DIFT can be elevated to 945 ℃ (Ae3+98 ℃). An interesting phenomenon is found that when the deformation temperature is between 870-920℃, the total stress is increased with deformation temperature decreasing. However, when deformed between 830-870℃, the total stress is decreased with deformation temperature decreasing. Compared with the diffraction peak of proeutectoid ferrite, the diffraction peak of DIF was shift to a low angle in XRD analysis, and both the nanoindentation hardness and elastic modulus of DIF are much higher than those of proeutectoid ferrite, which proved DIF to be a kind of martensite. Key words:  deformation induced ferrite transformation      low carbon steel      upper limit temperature            Received:  30 June 2005      ZTFLH:  TG113.1     TG142.31   Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors LIU Zhaoxia LI Dianzhong QIAO Guiwen URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y2005/V41/I11/1127 [1] Priestner R, Hodgson P D. 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