Elsevier

Wear

Volumes 460–461, 15 November 2020, 203484
Wear

Influence of fracture toughness on two-body abrasive wear of nanostructured carbide-free bainitic steels

https://doi.org/10.1016/j.wear.2020.203484Get rights and content
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Highlights

  • Abrasive wear resistance of carbide-free bainitic steels does not only depend on hardness.

  • Carbide-free bainitic microstructure with an optimum combination of hardness and toughness offers the best wear resistance.

  • Retained austenite has a beneficial effect on reducing two-body abrasive wear.

  • During two-body abrasive wear, no significant strain hardening occurs beneath the worn surface.

Abstract

This study aims to understand the effects of toughness and hardness on two-body wear of nanostructured carbide-free bainitic steels. For this purpose, three different steel grades were austempered at 250 °C to obtain carbide-free bainitic microstructures with different mechanical properties. The mechanical properties were determined in terms of fracture toughness and hardness. The wear tests were carried-out at three different loads with two different types of abrasive papers. The results show that a carbide-free bainitic steel with an optimum combination of hardness and fracture toughness exhibits the highest wear resistance. It has been seen that hardness is not the only parameter in determining the abrasive wear resistance and retained austenite has a beneficial effect on two-body abrasive wear.

Keywords

Abrasive
Bainite
Toughness
Wear
Carbide free
Retained austenite

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