Effect of Nanoadditives on the Structure and Properties of Austempered Ductile Irons

Abstract:

In the present study austempered ductile irons (ADI) with an upper and lower bainitic structure with nanosized particles of cubic boron nitride cBN (50nm) are studied. The austempering modes include austenization at 900^оС during an hour and isothermal retention at 280^оС from 0.5 to 6 hours and at 380^oС from 0.5 to 6 hours. The samples microstructure is investigated by means of an optical metallography, scanning electron microscopy and X-ray analysis. Tests for hardness, impact toughness and wear are performed. The influence of nanosized additives on the kinetic of the bainitic transformation and on the morphology of the obtained bainitic structure is studied. It is established that the changes of the bainitic cast irons microstructure under influence of the nanoparticles of cBN lead to the cast irons impact toughness and wear resistance increase. The research is aimed at expanding the scope for new ADI applications in the industry.

• Periodical: Materials Science Forum (Volume 919)
• Pages: 34-42
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.919.34
• Online since: April 2018
• Authors: Julieta Atanasova Kaleicheva*, Valentin Plamenov Mishev
• Keywords: Cubic Boron Nitride, Kinetic, Lower Bainite, Mechanical Properties, Microstructure, Retained Austenite, Upper Bainite, Wear Resistance

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