The role of porosity in the dry sliding wear of a sintered ferrous alloy

Dubrujeaud, B.; Vardavoulias, M.; Jeandin, Michel

doi:10.1016/0043-1648(94)90097-3

Cited by 77 publications

(44 citation statements)

References 10 publications

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“…This model further explains the drop in wear rate at both high porosity and large pore size for Al-6% Si. Dubrujeaud et al [17] reached at similar conclusions that high porosity and large pore size have a beneficial effect on wear rate. However, they concluded that the drop in wear rate at high porosity content is attributed to the entrapment of wear debris in large pores.…”

Section: Wear Mechanismssupporting

confidence: 56%

“…The influence of porosity on the wear behavior of materials has been found to be rather complex and has not been clearly identified. It is pertinent to note that both beneficial and detrimental effects of porosity on wear resistance have been reported in the literature [15][16][17]. Chen et al [18] investigated the influence of porosity on composite materials and suggested that porosity may help to absorb the impact energy that accompanies crack splitting.…”

Section: Introductionmentioning

confidence: 99%

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Reciprocating Wear Behavior of Al Alloys: Effect of Porosity and Normal Load

Sinha¹,

Islam²,

Farhat³

2015

Int J Metall Mater Eng

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Aluminum alloys are attractive for critical applications such as pistons, clutch housings and liners in automotive industry for their high strength to weight ratio, high corrosion resistance and good heat conductivity. These alloys can be fabricated using casting and powder metallurgy techniques in which porosity is a common feature. The presences of pores adversely affect the mechanical properties and wear resistance of these components. Not only the total area percentage of porosity influences the degradation in properties but also size, shape and interconnectivity of pores play an important role. In this study, aluminum alloys were produced using powder metallurgy technique. The amount of porosity was varied by varying compaction pressure and amount of wax added before compaction. Reciprocating wear tests (ball-on-flat configuration) were performed against AISI 52100 bearing steel ball under both low (1.5-5N) and high (6-20N) loads. Scanning electron microscopy was employed in order to identify possible wear mechanisms. Both detrimental and beneficial effects of porosity under different loading conditions were observed. An attempt has been made to develop a relationship between pore size and distribution and wear behavior of aluminum alloys.

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Section: Wear Mechanismssupporting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Reciprocating Wear Behavior of Al Alloys: Effect of Porosity and Normal Load

Sinha¹,

Islam²,

Farhat³

2015

Int J Metall Mater Eng

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“…At first, an oxide layer exists, so the friction coefficient is somewhat lower; this oxide layer eventually wears away, leading to more metal-to-metal contact and a more adhesive friction mechanism, possibly resulting in a higher friction coefficient. In the meantime, as wear is developing, considerable debris [6][7][8][9][10][11] may enter into the pin-disc contact. The presence of debris between the contact surfaces somewhat enhances the surface roughness in an indirect way, giving a transiently lower value of λ.…”

Section: Friction Results and Mechanismsmentioning

confidence: 99%

“…He built a knowledge base usable in the design step to take account of the effects of material variables (porosity and microhardness) and geometric parameters on wear resistance. Porosity influences PM materials by reducing the load-bearing surface and increasing the local plastic deformation, generating debris, and entrapping wear debris [6][7][8][9][10][11], all of which influence the wear behavior of PM materials. Govindarajan [12] investigated the lubricated rolling-sliding contact fatigue damage mechanisms of sintered steel material and found surface cracks opening up at higher rolling-sliding contact ratios.…”

Section: Introductionmentioning

confidence: 99%

A pin-on-disc study of the tribology characteristics of sintered versus standard steel gear materials

Sosa

Olofsson

2015

Wear

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a b s t r a c tThough powder metallurgy (PM) allows manufacturing of complex components, including gears, we lack knowledge of the tribological performance of PM versus standard steel gear materials. Using a pin-ondisc machine, we simulate the sliding part of gear tooth contact in boundary and mixed lubricated regions, comparing the tribological characteristics of two sintered gear materials with those of a standard gear material. The comparison considered damage mechanisms, wear, and friction between these materials in different configurations (i.e., standard versus standard, sintered versus sintered, and sintered versus standard). The results indicate that, for pairings of the same gear materials, i.e., RS-RS (16MnCr5), AQ-AQ (Distaloy AQ þ 0.2% C), and Mo-Mo (Astaloy 85Mo þ0.2% C), RS has a lower friction coefficient. For PM and RS combinations, both PM pins have lower friction coefficients with RS disc material than do RS pins with PM disc materials. For the wear coefficient, at low and high speeds, RS pins always display better wear resistance than do AQ or Mo pins because of their high hardness and compacted microstructure. For RS-PM combinations, Mo pins display higher wear resistance than do AQ pins because their larger and more numerous pores enable good lubrication. Pins in the Mo-RS combination displayed the highest wear resistance, mainly because the pores in Mo discs hold lubricant, lubricating the contact surface and preventing adhesive wear. For the RS pin in the Mo-RS combination and the AQ pin in RS-AQ, the damage mechanism is slight adhesive wear and scuffing. For pins in the PM-PM, RS-PM, AQ-RS, and RS-RS combinations, the damage mechanism is a heavier scuffing-type adhesive wear.

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“…In addition, trapping of wear debris from sliding interfaces may be another important task achieved by the pores [58]; however, the behaviour depends on the imposed tribological system. It has been observed that pores can be beneficial in some systems and detrimental in others [59,60].…”

Section: Introductionmentioning

confidence: 99%

Tribological behaviour of sintered iron based self-lubricating composites

et al. 2017

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This work is a review of previous works, presenting and discussing the most important results obtained by an ongoing research program towards the development of innovative, low-cost, self-lubricating composites with a low friction coefficient and high mechanical strength and wear resistance. Special emphasis is given to uniaxial die pressing of solid lubricant particles mixed with matrix powders and to metal injection moulding associated with in situ generation of solid lubricant particles. Initially, a microstructural model/ processing route (powder injection moulding followed by plasma-assisted debinding and sintering) produced a homogeneous dispersion of in situ generated solid lubricant particles. Micrometric nodules of graphite with diameter smaller than 20 μm were formed, constituting a nanostructured stacking of graphite foils with nanometric thickness. Micro Raman analysis indicated that the graphite nodules were composed of turbostratic 2D graphite having highly misaligned graphene planes separated by large interlamellae distance. Large interplanar distance between the graphene foils and misalignment of these foils were confirmed by transmission electron microscopy and were, probably, the origin of the outstandingly low dry friction coefficient (0.04). The effect of sintering temperature, precursor content, metallic matrix composition and surface finish is also reported. Furthermore, the influence of a double-pressing/double-sintering (DPDS) technique on the tribological performance of self-lubricating uniaxially die-pressed hBN + graphite-Fe-Si-C-Mo composite is also investigated. Moreover, the tribological behaviour of die-pressed Fe-Si-C matrix composites containing 5, 7.5 and 10 wt% solid lubricants (hBN and graphite) added during the mixing step is analysed in terms of mechanical properties and wear mechanisms. Finally, the synergy between solid lubricant particles dispersed in a metallic matrix and fluid lubricants in a cooperative mixed lubrication regime is presented.

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The role of porosity in the dry sliding wear of a sintered ferrous alloy

Cited by 77 publications

References 10 publications

Reciprocating Wear Behavior of Al Alloys: Effect of Porosity and Normal Load

Reciprocating Wear Behavior of Al Alloys: Effect of Porosity and Normal Load

A pin-on-disc study of the tribology characteristics of sintered versus standard steel gear materials

Tribological behaviour of sintered iron based self-lubricating composites

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