Wear Mechanism of Chromium Pre-Alloyed Sintered Steel

Bidulský, Róbert; Grande, Marco Actis; Bidulská, Jana; Vlado, Martin; Kvačkaj, Tibor

doi:10.1515/htmp.2009.28.3.175

Cited by 21 publications

(21 citation statements)

References 11 publications

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“…FEM provide useful data about metalworking processes and their limits [18][19][20][21][22][23]. The knowledge of the ductile fracture criteria is highly advantageous for mathematical simulations [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Determination of ductile fracture criteria for bulk and PM materials

KVACKAJ¹,

TIŽA²,

KOVÁČOVÁ³

et al. 2016

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In the paper, calculation of the ductile fracture criteria for experimental materials as HSLA (high strength low alloy) steel, aluminium alloy EN AW 6082 T6 and powder metallurgy material ALUMIX 321 was carried out. Using ring and compression tests, it was possible to determine friction coefficient, stress-strain curves, constants for the Hollomon's equation, material workability and nCL (normalized Cockcroft-Latham) criteria. Moreover, the results from the nCL criteria calculations obtained from compression tests and numerical simulations were compared and verified. Numerical simulations were done by the Deform 3D software. It was confirmed that both methods provide similar results.

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Section: Introductionmentioning

confidence: 99%

Determination of ductile fracture criteria for bulk and PM materials

KVACKAJ¹,

TIŽA²,

KOVÁČOVÁ³

et al. 2016

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“…The same trend was observed from the plot 2(c) the mass loss is reduced for the higher density (95%) preforms whereas for the 85% and 90% density preforms mass loss increasing linearly with sliding distance particularly in high applied load [1]. The reason may be due to the second phase high dense hard WTiC presence along with porosity (greater than 10%) results in the thermal softening of the material can give rise to considerable stressconcentration effects that favour the nucleation and propagation of micro-cracks, leading to the easier formation of wear fragments [18]. Therefore, delamination wear in the higher load and oxidation wear in lower load seems to be the main wear mechanisms.…”

Section: Wear Behaviour Of Sintered Titanium Alloyed P/m Steelmentioning

confidence: 99%

Influence of Titanium on dry sliding Wear Behaviour of Sintered P/M low Alloy Steel (Fe-C-W)

Prabu

Prathiba

Venkatesan

et al. 2014

Procedia Engineering

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Powder metallurgy (P/M) manufacturing process is one of the rapidly emerging fields and has extended the applications in aerospace, automotive, manufacturing industries replacing all traditional methods of metal forming operations because of its less energy consumption, maximum material utilization, low relative material wastage, low capital cost. The mechanical properties is mainly depends on the final density of sintered P/M alloys. The typical microstructure characteristics of sintered steel represent an important parameter affecting their wear behaviour. The present research work pertains to the study of dry sliding wear characteristics of sintered P/M Fe-1%C-1%W-1%Ti low alloy steel with different densities (85%, 90%, 95%), as they find several applications in manufacturing industries, particularly in automobile industries. These components usually face workingconditions involving abrasion, rolling and sliding, making it important to study the wear phenomenon. The wear behavior of the as-sintered preforms were studied under dry conditions on pin-on disc arrangement (ASTM G99) against EN 38 steel disc of Hardness HRC 60 with a sliding speed of 2 m/s and at a normal loads of 30, 50, 70N respectively. Wear mechanism of the worn out surfaces and microstructure of sintered P/M alloy steel has been characterized using both optical microscopy and SEM. Ferritic-pearlite microstructure are revealed from the as-sintered P/M alloy steels. Wear rate increases gradually with increase in porosity with respect to applied load. The main wear mechanism in the Ti alloyed P/M steel seems to be delamination wear in the higher load and oxidation wear at lower load. Failure by a delamination process is clearly indicated by the shape of the debris particles.

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“…The improvement of wear resistance and hardness is probably connected with the refinement of the hard silicide particles by all alloying elements. Porosity and the pores geometry can also play important role in wear mechanism [16,17]. Sharp-edged isolated pores were reported act as stress concentrators, leading to the nucleation and propagation of microcracks.…”

Section: Experimental Materials and Conditionsmentioning

confidence: 99%

EFFECT OF ALLOYING ELEMENTS ON PROPERTIES OF PM Ti-Al-Si ALLOYS

Novák¹,

Kříž²,

Michalcová³

et al. 2013

Acta Metall Slovaca

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This work was devoted to the description of the effect of alloying by transition metals (Cr, Cu, Fe) on the structure and properties of TiAl15Si15 alloy. Alloying elements does not form separate phases, being dissolved in titanium silicide or aluminide. Cu was found predominantly in aluminide phase, while iron was found to bethe silicide-former. Chromium dissolved in both aluminide and silicide in almost comparable amounts. All applied alloying elements increased the wear resistance, but reduced the room-temperature compression strength. The addition of iron and chromium strongly increase the thermal stability at 1000°C by stabilizing the silicide phase.Keywords: reactive sintering; mechanical properties testing; intermetallic compounds; oxidation 1 Introduction Alloys based on titanium aluminides (Ti 3 Al and TiAl) are modern materials for hightemperature applications. Due to low density, good mechanical properties and oxidation resistance at high temperatures, these alloys already found its application in the aerospace industry. The application limits of Ti 3 Al phase are 760°C in inert atmosphere (creep limit) and approx. 600°C in air (oxidation limit) [1]. Application range of TiAl phase is 750°C in air and approx. 900°C in inert atmosphere or vacuum [1]. It shows that the temperature range of application of all Ti-Al phases is strongly limited by their high-temperature oxidation. To improve the high-temperature oxidation behaviour of these materials, additions of various alloying elements are applied. Previously, it was reported that niobium and tantalum increase the high-temperature oxidation resistance [2] and creep behaviour [3] of Ti-Al alloys. It led to the development of new generation of Ti-Al alloys [4]. However these heavy and expensive elements undesirably increase the density and cost. Other possibility how to improve hightemperature behaviour is alloying with silicon. When Ti-Al-Si alloys are produced by conventional melting metallurgy techniques, coarse sharp-edged particles of Ti 5 Si 3 silicide are formed, having negative impact on mechanical properties such as ductility or fracture toughness. Simple production route leading to the fine structure is a reactive sintering powder metallurgy. In our previous works [5], [6], production route for Ti-Al-Si alloys with aluminium content between 8 and 20 wt. % and silicon in the range of 10-20 wt. % was developed and roomtemperature properties were described [5]. There are many papers dealing with the influence of various alloying elements on the structure and selected properties of Ti-Al and Ti-Si binary alloys. In addition to the effect of Nb and Ta,

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Wear Mechanism of Chromium Pre-Alloyed Sintered Steel

Cited by 21 publications

References 11 publications

Determination of ductile fracture criteria for bulk and PM materials

Determination of ductile fracture criteria for bulk and PM materials

Influence of Titanium on dry sliding Wear Behaviour of Sintered P/M low Alloy Steel (Fe-C-W)

EFFECT OF ALLOYING ELEMENTS ON PROPERTIES OF PM Ti-Al-Si ALLOYS

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