Laser-ultrasonic Monitoring of Austenite Recrystallization in C-Mn Steel

DOI Web Site 被引用文献2件 参考文献44件
  • Smith Ali
    Netherlands Institute for Metals Research Department of Materials Science & Engineering, Delft University of Technology
  • Kruger Silvio E.
    IMI-National Research Council of Canada
  • Sietsma Jilt
    Department of Materials Science & Engineering, Delft University of Technology
  • van der Zwaag Sybrand
    Faculty of Aerospace Engineering, Delft University of Technology

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The static recrystallization kinetics of hot deformed austenite were characterised by a combination of in-situ laser-ultrasonics and stress relaxation measurements. Samples were deformed in compression at temperatures of 850°C and 900°C. The applied strain was varied between 0.2 and 0.5, whilst the strain rates used were 0.1 s−1 and 0.5 s−1. At various points during annealing samples were quenched and analysed by optical microscopy.<br>During recovery prior to recrystallization the ultrasonic velocity change and attenuation were almost constant. During recrystallization, the velocity change and attenuation decreased for the conditions imposed. The decrease in velocity change was mostly due to a change in the overall texture. The decrease in attenuation could be explained by a change in grain size. Unfortunately, the additional effect of dislocation damping on attenuation could not be quantified.<br>Comparison of the stress relaxation kinetics with the observed decrease in ultrasonic velocity change and attenuation generally showed good agreement.<br>From the attenuation measurements the grain sizes in the recrystallised structure for various applied strains were calculated. Comparison with grain sizes determined from optical microscopy showed reasonable agreement considering the accuracy of the attenuation measurements and the assumptions made.

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