Mechanisms of Plastic Deformation during Laser Heat Treatment of ARMCO Pure Iron

Abstract:

The work is devoted to the study of the phenomenon of grain boundary slippage (GBS) in the ARMCO pure iron at the periphery of the laser treatment zone. Using optical metallography and high-resolution scanning electron microscopy (SEM), the characteristic features of the GBS mechanism were revealed: stepped boundaries, accommodation zones, and grain rotation. It was found that under laser irradiation in the heat-affected zone, the plastic deformation of the ferrite matrix is ​​fully realized by the GBS. Slipping of boundaries is carried out under conditions of ultra-high-speed heating of the ferrite matrix not lower than 700 °C, and the degree of deformation by the GBS mechanism does not exceed 5-6%.

• Periodical: Materials Science Forum (Volume 1052)
• Pages: 74-79
• DOI: https://doi.org/10.4028/p-sin6n9
• Online since: February 2022
• Authors: Valery N. Varavka, Oleg V. Kudryakov*, Igor S. Morozkin
• Keywords: Electron Microscopy, Grain-Boundary Sliding, Microplastic Deformation, Pulsed Laser Irradiation, Technical Iron

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