Effects of Thermomechanical Processing on Uniformity of Microstructure and Properties of AHSS

Abstract:

Hot strip rolling of steels inherently results in non-homogeneous microstructure and mechanical properties of hot bands. Thermomechanical processing that implies careful selection of rolling temperatures, speeds, reductions and controlled cooling parameters, as well as their accurate in-bar dynamic control allows not only for reducing the inherent microstructure variability but also for attenuating and even eliminating the adverse downstream manifestations of microstructure non-homogeneities. This is especially pertinent to advance high strength steels (AHSS) for automotive applications that have been shown to possess high sensitivity to variations in industrial processing conditions. Examples of industrial data and real time monitoring of hot band microstructure evolution using online non-destructive technique are presented confirming the efficiency of thermomechanical processing in ensuring the proper quality of AHSS sheet products.

• Periodical: Materials Science Forum (Volumes 783-786)
• Pages: 967-972
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.783-786.967
• Online since: May 2014
• Authors: Artem Marmulev*, Lyudmila M. Kaputkina, Gwenola Herman, Evgueni I. Poliak
• Keywords: Coil Cooling, Cold Rolled Strip, Electromagnetic Sensor, Hot Strip Rolling, Phase Transformation, Thickness Defect

References

[1] E.I. Poliak, N.S. Pottore, R.M. Skolly, W. P Umlauf, J. Brannbacka, Thermomechanical Processing of Advanced High Strength Steels in Production Hot Strip Rolling, La Metallurgia Italiana (2009) February, pp.1-8.

[2] Marmulev A.V., Herman G., Poliak E.I., Kaputkina L.M., Factors Affecting Gauge Uniformity of Flat Cold Rolled AHSS, Proceeding of Materials Science and Technology (MS&T- 2011) International Conference, October 16-20, 2011, Columbus, Ohio, USA, p.470.