Influence of residual porosity on the dry and lubricated sliding wear of a powder metallurgy austenitic stainless steel

Martín-Pedrosa, Fernando; Garcı́a, C.; Blanco, Y.

doi:10.1016/j.wear.2015.01.025

Cited by 43 publications

(22 citation statements)

References 22 publications

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“…Surface pores could be somehow compared to surface micro cavities produced by texturing technique, thus porosity could potentially improve tribological performance in specific conditions. Mechanical effects of porosity were largely studied and evaluated [11][12][13][14], however only few researches ventured to attempt evaluating the tribological effects of pores up to now [15][16][17].…”

Section: Context Of the Researchmentioning

confidence: 99%

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An experimental assessment of surface micro irregularities (porosity and texture) effects on tribological behaviour under lubricated conditions.

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recent years, although this procedure usually implies extra manufacturing operations and costs. On the other hand, sintered materials contain themselves surface cavities that could potentially act as surface texture and, consequently, lead to friction reduction. This research aims to extend the current knowledge on the tribological influence of micro surface irregularities (pores and laser texture) under lubricated experimental tests and explore the use of these features for tribological applications. Samples were manufactured using both sintering and texturing processes to obtain different surface characteristics. Three different porosity conditions were produced for sintered steels, whereas grooves and dimples configurations were designed for textured steel samples. After that, experimental tests were performed under varying sliding-rolling conditions (from prevalent rolling to prevalent sliding) especially using non-conformal contact. Speed was also varied during frictional tests to cover a wide range of operational conditions and verify the effects of surface features under different lubrication regimes. Friction tests were carried out with two tribometers using configurations of pin-on-disk, roller-on-disk and ball-on-disk. Film thickness was measured by an ultra-thin optical interferometry rig using a methodology properly designed for rough samples. Samples with smooth surfaces were utilized as a reference bench to be compared to material with surface modification (texture or porosity). Main results showed that the decrease of porosity led to friction reduction in the sintered steel. Material with reduced porosity performed even better than reference smooth samples. In addition, the dimple configuration promoted friction reduction, whereas grooves generally performed similarly or worse than reference material. Even if textured dimples and small porosity on sintered material were produced by different techniques, they presented similar geometrical characteristics and consequently they both reduced friction compared to reference samples. As part of the outcome, main results were mapped to better understand the effect of each surface feature on tribological performance. Furthermore, a preliminary phenomenological model was proposed to predict frictional response of surface with micro cavities (pores or texture) from reference steel results. Main findings suggest that the effect of tailored surface cavities could be somehow compared to randomly distributed ones, even if produced by very different manufacturing techniques.

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Section: Context Of the Researchmentioning

confidence: 99%

“…Besides total (volume) porosity, also pore distribution and main geometrical characteristics should be considered [15,22,23].…”

Section: Porosity and Pore Morphology Measurementsmentioning

confidence: 99%

An experimental assessment of surface micro irregularities (porosity and texture) effects on tribological behaviour under lubricated conditions.

Boidi¹

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“…On one hand, for samples sintered in PSA, the maximum density (100%) was obtained for composite reinforced with 3 wt.% of VC, a higher value of wear resistance is assigned to lower porosity levels [32]. On the other hand, it is known that if exists an insufficient bonding between the reinforcement and the matrix or an unfavorable size and distribution of hard phases inside the matrix, the high density of carbides produces an increase of wear rate due to the large amount of loss material when the carbides are removed [4,5].…”

Section: Wear Mechanismsmentioning

confidence: 99%

Effect of vanadium carbide on dry sliding wear behavior of powder metallurgy AISI M2 high speed steel processed by concentrated solar energy

Garcı́a

Romero

Herranz

et al. 2016

Materials Characterization

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Mixtures of AISI M2 high speed steel and vanadium carbide (3, 6 or 10 wt.%) were prepared by powder metallurgy and sintered by concentrated solar energy (CSE). Two different powerful solar furnaces were employed to sinter the parts and the results were compared with those obtained by conventional powder metallurgy using a tubular electric furnace. CSE allowed significant reduction of processing times and high heating rates. The wear resistance of compacts was studied by using rotating pin-on-disk and linearly reciprocating ball-on-flat methods. Wear mechanisms were investigated by means of scanning electron microscopy (SEM) observations and chemical inspections of the microstructures of the samples. Better wear properties than those obtained by conventional powder metallurgy were achieved. The refinement of the microstructure and the formation of carbonitrides were the reasons for this.

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“…On the other hand, the wear resistance is independent of the density of the part. F. Martin et al [27] found that AISI 316L with different porosity has different wear characteristics with different lubrication conditions. In the case of carboxymethyl cellulose sodium salt medium viscosity (CMC) lubricant, the wear rate decreases with the increase of porosity.…”

Section: Introductionmentioning

confidence: 99%

Wear Performance of Metal Materials Fabricated by Powder Bed Fusion: A Literature Review

Qin

Lan

et al. 2020

Metals

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Powder Bed Fusion (PBF) is an additive manufacturing technology used to produce metal-based materials. PBF materials have a unique microstructure as a result from repeated and sharp heating/cooling cycles. Many researches have been carried out on relations between processing parameters of the PBF technology, obtained microstructures and mechanical properties. However, there are few studies on the tribological properties of PBF materials at various contact conditions. This article describes previous and recent studies related to the friction performance. This is a critical aspect if PBF materials are applied to friction pair components. This paper discusses wear rates and wear mechanisms of PBF materials under dry friction, boundary lubrication and micro-motion conditions. PBF materials have higher hardness due to fine grains. PBF materials have a higher wear resistance than traditional materials due to their solid solution strengthening. In addition, hard particles on the surface of PBF components can effectively reduce wear. The reasonable combination of process parameters can effectively improve the density of parts and thus further improve the wear resistance. This review paper summarized the wear behavior of PBF materials, the wear mechanism of metal materials from dry friction to different lubrication conditions, and the wear behavior under fretting wear. This will help to control the processing parameters and material powder composition of parts, so as to achieve the required material properties of parts and further improve the wear performance.

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Influence of residual porosity on the dry and lubricated sliding wear of a powder metallurgy austenitic stainless steel

Cited by 43 publications

References 22 publications

An experimental assessment of surface micro irregularities (porosity and texture) effects on tribological behaviour under lubricated conditions.

An experimental assessment of surface micro irregularities (porosity and texture) effects on tribological behaviour under lubricated conditions.

Effect of vanadium carbide on dry sliding wear behavior of powder metallurgy AISI M2 high speed steel processed by concentrated solar energy

Wear Performance of Metal Materials Fabricated by Powder Bed Fusion: A Literature Review

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