[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

Friction and wear of a piston ring/cylinder liner at the top dead centre: Experimental study and modelling

Piston ring wear and cylinder liner tribofilm in tribotests with lubricants artificially altered with ethanol combustion products

Aluminum-base surface hybrid composites have been fabricated by mixtures of SiO2 and Al2O3 particles on an Al–Si cast aluminum alloy using friction stir processing with the aim of achieving higher ...

Wear and mechanical properties of surface hybrid metal matrix composites on Al–Si aluminum alloys fabricated by friction stir processing:

The present work proposes an advanced double quenching and tempering heat treatment based laser surface modification process of dual-phase spring steel. Multiple laser peening without coating process utilized the decarburized surface as the protective layer for the further cold working process. The electron backscattering diffraction analysis on crystallographic orientation of individual grains and phase map exhibits a perfect dual-phase steel. Also, the high resolution transmission electron microscopic study explains the high strain induced microstructural grain refinement features and plastic deformation behaviors. The laser peening technique taking an advantage that it induces a large and high magnitude compressive residual stress with good thermal stability. The micro and nano-hardness profile provides better surface and sub-surface mechanical properties. The controlled average surface roughness is achieved in this course of work. The stress-strain characteristics on tensile properties are analyzed through the pre-fatigued specimens. The fully reversed high cycle fatigue test indicates that the current laser peening has substantially improves the fatigue life of the specimens.

Compound technology of manufacturing and multiple laser peening on microstructure and fatigue life of dual-phase spring steel

Piston Ring Tribological Challenges on the Next Generation of Flex-fuel Engines

This paper aims to investigate the copper and the magnesium effects on the microstructure, on the hardness, and on the resistance to micro-abrasive wear of the alloy Al–19Si. Early findings could show that the hypereutectic Al–Si alloys fabricated by centrifugal casting exhibited the possibility of obtaining a Functionally Graded Material (FGM), as well as the less-dense particles tended to be concentrated in the region close to the tube inner surface. It was observed that the wear resistance in this region was increased by the concentration of primary Si and Mg2Si particles due to their smaller densities than that of the Al. Also, the Cu and Mg were added in contents of 2.5 and 5% by weight. Moreover, this study focused on understanding the radial β-Si and Mg2Si particles migration in the Al–19Si alloy tubes and their effect on hardness and wear resistance. Firstly, a large quantity of primary Si and Mg2Si particles were concentrated in the inner layer of the tubes produced by centrifugal casting in the alloys Al–19Si, Al–19Si–2.5Cu–2.5Mg and Al–19Si–5Cu–5Mg. After that, the hardness increase was related to the number of primary particles presented in this tube region. Therefore, the segregation of the primary particles towards the inner surface of the tube was more pronounced in the casting end region and the wear resistance was also related to the presence of the primary particles. However, an excessive number of primary particles accumulated near this region could lead to higher wear due to the higher particles tearing.

Effect of Mg and Cu on microstructure, hardness and wear on functionally graded Al–19Si alloy prepared by centrifugal casting

Effect of chemical banding on the local hardenability in AISI 4340 steel bar

The nitriding behavior of austenitic stainless steels (AISI 304 and 316) was studied by different cold work degree (0% (after heat treated), 10%, 20%, 30%, and 40%) before nitride processing. The microstructure, layer thickness, hardness, and chemical microcomposition were evaluated employing optical microscopy, Vickers hardness, and scanning electron microscopy techniques (WDS microanalysis). The initial cold work (previous plastic deformations) in both AISI 304 and 306 austenitic stainless steels does not show special influence in all applied nitriding kinetics (in layer thicknesses). The nitriding processes have formed two layers, one external layer formed by expanded austenite with high nitrogen content, followed by another thinner layer just below formed by expanded austenite with a high presence of carbon (back diffusion). An enhanced diffusion can be observed on AISI 304 steel comparing with AISI 316 steel (a nitrided layer thicker can be noticed in the AISI 304 steel). The mechanical strength of both steels after nitriding processes reveals significant hardness values, almost 1100 HV, on the nitrided layers.

/pdf/nitriding-process-characterization-of-cold-worked-aisi-304-shgi1b1tze.pdf

Nitriding Process Characterization of Cold Worked AISI 304 and 316 Austenitic Stainless Steels

The Effect of the Addition of Hard Particles on the Wear of Liner and Ring Materials Running with High Sulfur Fuel

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