Fretting wear of the nitrided medium carbon steel under line contact condition at an elevated temperature

Abstract

Purpose Fretting wear exists widely in the field of matching mechanical parts whereas previous research studies mostly focus on the point contact through a ball-plate tribometer. This paper aims to study the influence of wear debris on the fretting wear characteristics of the nitrided medium carbon steel under line contact condition at elevated temperature. Design/methodology/approach Fretting wear behavior of the nitrided medium carbon steel was experimentally investigated under line contact condition at elevated temperature and different normal loads without lubrication. Wear loss, worn surface and wear debris were studied to analyze the wear mechanism of nitrided steel. Findings The results showed that surface hardness of the medium carbon steel was notably improved because of the generation of a 230 µm nitrided case. Wear loss increased with the normal load, which was associated with the damage of a thin solid film formed by the wear debris, consisting of iron oxides and chromium oxide rather than only iron or iron oxides. The wear debris became partially amorphous and spherical because it was trapped within the contact interface and was ground, rolled, oxidized under line contact conditions. The spherical wear debris acted as a third body and formed a lubricating film between the contact faces. This lubricating film helped to stabilize the friction coefficient and reduced the wear rate, which further caused the acceleration of wear volume to gradually decrease. The wear mechanisms of the nitrided steel were oxidation wear, abrasive wear and fatigue spalling of the oxide layer. Originality/value The findings are helpful to understand the fretting wear behavior of the friction pair under line contact and enrich the fretting tribology theory.

Effect of load on the fretting behavior of SAF 2507 super duplex stainless steel in air and sea water

“…Results show that atmosphere composition directly influences the oxidation process, consequently the fretting regimes and wear (Esteves et al, 2015;Cai et al, 2009;Wang et al, 2019aWang et al, , 2019bWang et al, , 2019cWang et al, , 2019d. For SAF 2507 SDSS, displacement amplitude, microstructure and temperature variation have been studied in detail in our previous works (Wang et al, 2019a(Wang et al, , 2019b(Wang et al, , 2019c(Wang et al, , 2019d. Nevertheless, the influence of load on fretting behavior of metals including SAF 2507 SDSS remains unclear.…”

“…However, it is a challenge for metallic materials to work in marine field to overcome the corrosion problem (Luo et al, 2009). SAF 2507 SDSS, as one of the latest generation of stainless steels, with better mechanical strength and corrosion resistance, is received extensive attention in marine industries (Wang et al, 2019a(Wang et al, , 2019b(Wang et al, , 2019c(Wang et al, , 2019dHan et al, 2016). When using in sea water environment, the sliding wear and corrosion of SAF 2507 SDSS have been concerned (Pintaude et al, 2019;Tan et al, 2009;Ezuber et al, 2007).…”

Fretting Wear Behavior of Three Kinds of Rubbers under Sphere-On-Flat Contact

“…Zhang et al [ 27 ] evaluated the microstructure and fretting wear behavior of the 25CrNi2MoV steel. Wang [ 28 ] studied the influence of wear debris on the fretting wear characteristics of the nitrided medium carbon steel under line contact conditions at elevated temperatures. In addition, many researchers studied the protective capabilities of different coatings in fretting wear.…”