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Effect of austempering temperature on microstructure and cyclic deformation behaviour of multiphase low-carbon steel

Long X. Y., Branco R., Macek W., Nejad R. Masoudi, Lesiuk G., Zhu S. P., Amaro A. M.

Archives of Civil and Mechanical Engineering

2023

Vol. 23, no. 3

art. no. e201, 2023

This paper examined the cyclic deformation behaviour of multiphase low-carbon steel that was subjected to austempering heat treatments at four temperatures (190 °C, 230 °C, 275 °C, and 315 °C) below the martensite start temperature (Ms = 353 °C). The tests were conducted at room temperature, under fully reversed strain-controlled conditions, with strain amplitudes in the range 0.5–1.0%. The microstructure was observed by transmission electron microscopy, and the fracture surfaces were examined by scanning electron microscopy. The steel had a bainite/martensite microstructure, with increasing bainite content for higher austempering temperatures. Irrespective of the tested conditions, it strain-hardened during the first two cycles and then, strain-softened until failure. The austempering temperature did not significantly affect the stress-based, strain-based and energy-based relationships. However, lower austempering temperatures slightly improved the fatigue performance.