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Entropy 2016, 18(8), 290; doi:10.3390/e18080290

Control of Self-Organized Criticality through Adaptive Behavior of Nano-Structured Thin Film Coatings

1
McMaster Manufacturing Research Institute (MMRI), McMaster University, 1280 Main Street West, Hamilton, ON L8S 4L7, Canada
2
Department of Engineering, Centro Universitário—Católica de Santa Catarina em Joinville, Joinville 89203-005, Brazil
3
Joint Stock Company “Railway Research Institute”, 3rd Mytischinskaya Street 10, Moscow 129851, Russia
4
Biointerfaces Institute, McMaster University, 1280 Main Street West, Hamilton, ON L8S 4L7, Canada
5
Kobe Steel Ltd., Kobe 651–2271, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Michael M. Khonsari
Received: 21 June 2016 / Revised: 21 July 2016 / Accepted: 2 August 2016 / Published: 9 August 2016
(This article belongs to the Special Issue Entropy Application in Tribology)
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Abstract

In this paper, we will develop a strategy for controlling the self-organized critical process using the example of extreme tribological conditions caused by intensive build-up edge (BUE) formation that take place during machining of hard-to-cut austentic superduplex stainless steel SDSS UNS32750. From a tribological viewpoint, machining of this material involves intensive seizure and build-up edge formation at the tool/chip interface, which can result in catastrophic tool failure. Built-up edge is considered to be a very damaging process in the system. The periodical breakage of the build-ups may eventually result in tool tip breakage and, thereby, lead to a catastrophe (complete loss of workability) in the system. The dynamic process of build-up edge formation is similar to an avalanche. It is governed by stick-slip phenomenon during friction and associated with the self-organized critical process. Investigation of wear patterns on the frictional surfaces of cutting tools using Scanning Electron Microscope (SEM), combined with chip undersurface characterization and frictional (cutting) force analyses, confirms this hypothesis. The control of self-organized criticality is accomplished through application of a nano-multilayer TiAl60CrSiYN/TiAlCrN thin film Physical Vapor Deposition (PVD) coating containing elevated aluminum content on a cemented carbide tool. The suggested coating enhanced the formation of protective nano-scale tribo-films on the friction surface under operation. Moreover, machining process optimization contributed to further enhancement of this beneficial process, as evidenced by X-ray Photoelectron Spectroscopy (XPS) studies of tribo-films. This resulted in a reduction of the scale of the build ups leading to overall wear performance improvement. A new thermodynamic analysis is proposed concerning entropy production during friction in machining with buildup edge formation. This model is able to predict various phenomena and shows a good agreement with experimental results. In the presented research we demonstrated a novel experimental approach for controlling self-organized criticality using an example of the machining with buildup edge formation, which is similar to avalanches. This was done through enhanced adaptive performance of the surface engineered tribo-system, in the aim of reducing the scale and frequency of the avalanches. View Full-Text
Keywords: self-organized criticality; buildup edge formation; surface engineered system self-organized criticality; buildup edge formation; surface engineered system
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MDPI and ACS Style

Fox-Rabinovich, G.; Paiva, J.M.; Gershman, I.; Aramesh, M.; Cavelli, D.; Yamamoto, K.; Dosbaeva, G.; Veldhuis, S. Control of Self-Organized Criticality through Adaptive Behavior of Nano-Structured Thin Film Coatings. Entropy 2016, 18, 290.

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