Home Kovove Materialy-Metallic Materials 2019 Kovove Materialy-Metallic Materials Vol. 57 (2019), no. 3, pp.189–197

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Kovove Materialy-Metallic Materials Vol. 57 (2019), no. 3, pp.189–197

Title: Study on the microstructure and impact fracture behavior of martensitic alloy steels
Author: Z. B. Zheng, J. Long, K. H. Zheng, H. L. Zhou, H. Li, Q. L. Zhang

Abstract: Martensitic steels used for ball mill liners were prepared. The effect of tempering on the
microstructures, Rockwell hardness, and impact toughness of the tested steels was evaluated
at room temperature. The fracture morphologies were observed by using metallurgical microscopy,
scanning electron microscopy and energy-dispersive spectroscopy. The results showed
that tempering decreased the Rockwell hardness and significantly improved the impact toughness
of the tested steel. However, the impact toughness of the tempered steels was unstable.
Fracture of the tested steel before tempering was quasi-cleavage fracture; however, it changed
to ductile and quasi-cleavage fracture after tempering. Carbide segregations formed at the
local grain boundaries became the crack source and were the preferred ways for crack propagation
during the impact test. The existence of segregations was inferred to be the main
reason for the fluctuation of impact toughness.

Keywords: martensitic steel, tempering, mechanical properties, fracture
Published online: 21-May-2019
Year: 2019, Volume: 57, Issue: 3 Page From: 189, Page To: 197

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