Materials Today: Proceedings
Comprehensive review on improvement in surface properties of bearing steel
Introduction
Bearings are one of the important rotating equipment in the field of tribology. There is wide area of application from household items to vehicles, aerospace etc. Even under ideal installation and working conditions Rolling Contact Fatigue (RCF) is one of the important types of failure. The surface and subsurface fatigue is related to material configuration, impurities, microstructural changes. The sub surface-initiated fatigue is responsible for failure of bearing. As per application requirements the core material hardness and surface material hardness should be different, the surface hardness should be more. Increase in surface hardness creates the compressive forces which counter act tensile stresses created during working condition. This ultimately improves rolling contact fatigue (RCF) life of bearing. Various researchers are trying to improve on surface properties of bearing steel.
The design of surface layer plays important part in surface engineering. Due to demanding bearing applications the single material alone cannot stand of all of the requirements like, mechanical and thermal. Therefore, now a days with modern materials, modern manufacturing processes and nanotechnology various material combination and deposition methods are proposed. The customized material can give the required solution based on requirements. To create the designed surface layer the process, external material, time, skill should be optimum from costing point of view. Using surface treatment on engineering materials can increase the wear strength, decrease the friction coefficient, and improve corrosion resistance.
Related to coatings authors like Ali, Rodriguez, Scharf et al has studied about TiN and TiC coatings, Diamond like coatings (DLC), Tungsten Disulphide Nanocomposite coating [1], [2]. Variation of case depth is 0.24 µm to 4 µm. In other paper Zeng, Ravindra, Michael revealed the processes like nitrogen plasma immersion, plasma nitriding and various other processes [3], [4]. Enver, Michael, Mustafa, Yuta, Ozbek et al. these are some of the researchers who worked in area of boronising of bearing steels by various methods, powder pack boriding, laser boriding etc. [5], [6]. The boron group are the chemical elements in group 13 of the periodic table of elements. Boron is the element of great interest to various scientists. Case carburizing is also traditional surface treatment given to rolling bearings [7], [8]. The chemical composition of SAE 52100 steel is given in Table 1.
Section snippets
Discussion of various coatings to improve surface properties
The purpose of this paper is to discuss various process details and their effects on bearing surface material.
Various coatings and the related manufacturing processes are discussed in detail below one by one:
Coatings used to improve life of bearing;
Use of coatings Diamond like Coatings (DLC), ALD WS2/ZnF2 nanocomposite coatings [2], MoS2, TiN,TiC coating[9] etc. has bought its attention for rolling bearing steels. Various thickness range coatings i.e., 0.24 to 2.4 µm were produced on
Nitriding
There are three main types, gas, salt bath and plasma nitriding. The various researchers have studied about the nitrogen treatment on various types of steels. In case of bearing steel, plasma nitrogen immersion is discussed in details.
Nitrogen plasma immersion
The plasma immersion ion implantation has the capacity to instigate various elements at concentrations exceeding the solubility limits of conventional elements]. The dopants of multiple types at high ion concentrations can produce alloys in near surface region.
Summary
Even though bearing seems to be small component its engineering is crucial part. Surface engineering is very promising field in case of increasing life of bearing. From various processes discussed in this paper • The surface engineering approach clearly shows that TS process, followed by HIP, provides better diffusion and bonding due to high temperature. This helps improve the RCF life by controlling the residual compressive stresses.
Much work has been done on hard coating materials as compared
CRediT authorship contribution statement
Vrushali Y. Bhalerao: Conceptualization, Methodology, Validation, Formal analysis, Investigation, Resources, Data curation, Writing – original draft, Writing – review & editing, Visualization. Sanjay S. Lakade: Conceptualization, Validation, Formal analysis, Investigation, Data curation, Writing – review & editing, Visualization, Supervision, Project administration.
Declaration of Competing Interest
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
References (24)
Steels for bearings
Prog. Mater. Sci.
(2012)- et al.
The effects of conventional heat treatment and boronizing on abrasive wear and corrosion of SAE 1010, SAE 1040, D2 and 304 steels
Tribol. Int.
(2003) - et al.
Coating deposition and surface modification under combined plasma processing
Vacuum
(2004) - et al.
2D-nanomaterials for controlling friction and wear at interfaces
Nano Today
(2015) - et al.
The use of low-temperature plasma in a combined technology for the formation of wear-resistant boron-containing coatings
Surf. Coat. Technol.
(2020) - et al.
A novel method of laser surface hardening treatment inducing different thermal processing condition for Thin-sectioned 100Cr6 steel
Opt. Laser Technol.
(2020) - et al.
Carburization induced extra-long rolling contact fatigue life of high carbon bearing steel
Int. J. Fatigue
(2020) - et al.
Diamond like carbon coating of ball bearings for raceway surface by triboadhesion
Indian J. Eng. Mater. Sci.
(2014) - et al.
Atomic layer deposition of tungsten disulphide solid lubricant nanocomposite coatings on rolling element bearings
Tribol. Trans.
(2009) - et al.
A review of turning of hard steels used in bearing and automotive applications
Prod. Manuf. Res.
(2014)