Friction and anti-galling properties of hexagonal boron nitride (h-BN) in aluminium forming

Podgornik, Bojan; Kafexhiu, Fevzi; Kosec, Tadeja; Jerina, Jure; Kalin, Mitjan

doi:10.1016/j.wear.2017.04.026

Cited by 41 publications

(18 citation statements)

References 24 publications

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“…During the heating cycle, the water evaporates and leaves the hBN particles free within the contact, thus facilitating their easy removal from the contact, also observed in other studies [19]. However, other carrier fluids, particle size, and concentrations have shown good behaviour of hBN lubricants, when tested at low temperature [19,30].…”

Section: Hexagonal Boron Nitridementioning

confidence: 61%

Influence of lubrication, tool steel composition, and topography on the high temperature tribological behaviour of aluminium

et al. 2020

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The use of high strength aluminium alloys, such as 6XXX and 7XXX series, is continuously increasing for automotive applications in view of their good strength-to-weight ratio. Their formability at room temperature is limited and they are thus often formed at high temperatures to enable production of complex geometries. Critical challenges during hot forming of aluminium are the occurrence of severe adhesion and material transfer onto the forming tools. This negatively affects the tool life and the quality of the produced parts. In general, the main mechanisms involved in the occurrence of material transfer of aluminium alloys at high temperature are still not clearly understood. Therefore, this study is focussed on understanding of the friction and wear behaviour during interaction of Al6016 alloy and three different tool steels in as-received and polished state. The tribotests were carried out under dry and lubricated conditions, with two distinct lubricants, using a reciprocating friction and wear tester. The worn surfaces were analysed using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The results showed a high dependence of friction and wear behaviour on the tool steel roughness as well as on the stability of the lubricant films. Tribolayers were found to develop in the contact zone and their capacity to improve the tribological behaviour is seen to be drastically impacted by the surface roughness of the tool steel. When the tribolayers failed, severe adhesion took place and led to high and unstable friction as well as material transfer to the tool steel.

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Section: Hexagonal Boron Nitridementioning

confidence: 61%

Influence of lubrication, tool steel composition, and topography on the high temperature tribological behaviour of aluminium

et al. 2020

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“…In hot aluminum forming, a hexagonal boron nitride (h-BN) coating has been used to improve the anti-galling property of the tool. Results from load-scanner tests at an elevated temperature of 400 ℃ reveal that large h-BN powder size and low h-BN concentration can help [55]. Ti-Al-N coatings with Ta have proven to enhance hardness, thermal stability, and oxidation resistance; however, by optimizing the chemical composition of x alloyed Ti1-xAlxN coatings, the oxidation resistance can be significantly improved, resulting in a much wider range of applications [56].…”

Section: Improvement Of Anti-galling By Coated Toolsmentioning

confidence: 99%

Galling phenomena in metal forming

Dohda

Yamamoto

et al. 2020

Friction

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Galling phenomena in metal forming not only affect the quality of the engineered surfaces but also the success or failure of the manufacturing operation itself. This paper reviews the different galling conditions in sheet and bulk metal forming processes along with their evolution and the effects of temperature on galling. A group of anti-galling methods employed to prevent galling defects are also presented in detail. The techniques for quantitatively measuring galling are introduced, and the related prediction models, including friction, wear, and galling growth models, are presented to better understand the underlying phenomena. Galling phenomena in other processes similar to those occurring in metal forming are also examined to suggest different ways of further studying galling in metal forming. Finally, future research directions for the study of galling in metal forming are suggested.

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“…Podgornik et al [26,58] had conducted various experiment and comprehend relationship between the roughness of the sliding surfaces and the phenomenon of galling along with various other tribological properties of the sliding surfaces. Initially, the surface was prepared of surface roughness varying from R a ≈ 0.25 to 0.02 µm with the aid of shot peening, grinding and polishing with different grades and tested under load-scanning rig apparatus (as shown in Fig.…”

Section: Surface Topographymentioning

confidence: 99%

“…Hence, galling results in a decrease in strength, toughness, of seizure components, change in tool geometry, cause tearing at the distinct strained area and ultimately failure of a material and loss of material adds to the economy of the nation. Many researchers had studied the wear phenomenon in bio-implants such as knee replacement, hip replacement, shoulder replacement and fasteners used to assemble the orthopedic joints in the human body and concluded that effect of galling in bio-implants results in failure of a component that is a serious issue of concerned [58,61,62]. Therefore checking and monitoring the galling in numerous engineering components is a vital need, some of them are refining of tool design, surface treatment of the sliding interfaces or application of lubricous coating over the surfaces.…”

Section: Surface Hardnessmentioning

confidence: 99%

A review: advancements in fluoro-based polymers for aggrandizing anti-galling and wear resistant characteristics

2019

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Galling is the surface phenomenon which involves adhesion of local contact points and creation of protrusions on the juxtaposition of surfaces owing to high friction, inappropriate tribological loading, starved lubrication and high contact pressure (~ 1000 kPa). All these factors result in severe plastic deformation varying from 8000 to 10,000 µε (ε-strain) and diffusion of materials into one another, which consequently results in fatigue wear, surface roughness, tribocorrosion and seizing up of critical parts. The aim of the review is to analyze and summarizes the issue of galling, concurrently it also deals with the novel and economical mitigation method i.e. use of fluorine based coatings e.g. PTFE, owing to their lowest friction coefficient from 0.02 to 0.2 among other solids, high stiffness, high thermal stability and non-adherent characteristics that augments the mechanical and tribological properties and concurrently protect against hostile environments that eventually upsurges the life of components.

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Friction and anti-galling properties of hexagonal boron nitride (h-BN) in aluminium forming

Cited by 41 publications

References 24 publications

Influence of lubrication, tool steel composition, and topography on the high temperature tribological behaviour of aluminium

Influence of lubrication, tool steel composition, and topography on the high temperature tribological behaviour of aluminium

Galling phenomena in metal forming

A review: advancements in fluoro-based polymers for aggrandizing anti-galling and wear resistant characteristics

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