Effect of particle size on new constitutive relationship of aluminium–iron powder metallurgy composite during cold upsetting

Narayanasamy, R.; Ramesh, T.; Pandey, K.S.; Pandey, S.K.

doi:10.1016/j.matdes.2006.06.004

Cited by 31 publications

(20 citation statements)

References 18 publications

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“…20 The expressions for the normal stress (s z ), normal strain (e z ), hoop stress (s q ), hoop strain (e q ), hydrostatic stress (s m ), effective stress (s eff ), and effective strain (e eff ) were taken from N. Selvakumar et al 21 and Narayanasamy et al …”

Section: Theoretical Analysismentioning

confidence: 99%

Workability behaviour of Cu-TiB2 powder-metallurgy preforms during cold upsetting

Gadakary¹,

Khanra²,

Davidson³

2016

Mater. Tehnol.

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An investigation was carried out to find the workability behaviour of a Cu-TiB2 composite under triaxial stress-state conditions. Initially, the TiB2 powder was prepared by using a self-propagating high-temperature synthesis (SHS) technique and the same was added to a Cu matrix in order to make Cu-TiB2 composites. Cylindrical preforms with three different TiB2 weight percentages (2 %, 4 % and 6 %) with aspect ratios of 0.50, 0.75 and 1 were prepared using a uniaxial load. Then the preforms were pressureless sintered in a tubular furnace with a continuous flow of pure argon gas at 950°C for a period of 1 h. The cold upsetting test was carried out on the sintered specimens. The relationships between the various stresses, strains and the relative density were determined. The results for the various stress-ratio parameters, namely (sq/seff) and (sm/seff), the formability stress index (bs) under triaxial stress-state conditions were systematically analysed. The formability stress index was found to increase with the increase in preform fractional density and it decreased with the aspect ratios. This was because the preform contains more pores and the porous bed height is high. A statistical fitting method was performed on the curve drawn between the axial strain and the stress-formability index. The compacts with a higher value of the aspect ratio and the initial preform density showed a very high fracture strain. Keywords: SHS, powder metallurgy, TiB 2 , workability, relative density, fracture strain Izvr{ena je bila preiskava preoblikovalnosti Cu-TiB2 kompozita pri triosnem napetostnem stanju. Najprej je bil pripravljen prah TiB2; s pomo~jo napredujo~e visoko temperaturne sinteze (SHS), ki je bil dodan Cu osnovi, da bi napravili Cu-TiB2 kompozit. Z enoosnim stiskanjem so bili pripravljeni vzorci cilindri~ne oblike s tremi razli~nimi vsebnostmi TiB2 v masnih dele`ih (2 %, 4 % and 6 %) in z razmerjem 0,50, 0,75 in 1. Nato so bile predoblike sintrane v cevasti pe~i pri kontinuirnem pretoku~istega argona na temperaturi 950°C in trajanju 1 h. Kovni preizkus v hladnem je bil izveden na sintranih vzorcih. Ugotovljena je bila odvisnost med razli~nimi napetostmi, raztezki in relativne gostote. Sistemati~no so bili analizirani rezultati razli~nih parametrov (sq/seff) in (sm/seff) ter indeks preoblikovalnih napetosti (bs) pri triosnem napetostnem stanju. Ugotovljeno je, da indeks preoblikovalne napetosti nara{~a z nara{~anjem gostote predoblike in se zmanj{uje z razmerjem {irina-vi{ina. Razlog za to je ve~je {tevilo por v predobliki in zato je vi{ina poroznega vzorca vi{ja. Izvedena je bila tudi statisti~na obdelava krivulje, narisane med osno napetostjo in indeksom preoblikovalne napetosti. Stiskanci z vi{jo vrednostjo razmerja med {irino in vi{ino ter ve~jo gostoto predoblike, so pokazali veliko napetost pri poru{itvi. Klju~ne besede: SHS, metalurgija prahov, TiB2, preoblikovalnost, relativna gostota, napetost pri poru{itvi

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Section: Theoretical Analysismentioning

confidence: 99%

Workability behaviour of Cu-TiB2 powder-metallurgy preforms during cold upsetting

Gadakary¹,

Khanra²,

Davidson³

2016

Mater. Tehnol.

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“…In the upsetting of P/M parts, the height decreases, the average density increases, and the various stress increases [12].…”

Section: Uniaxial Stress State Conditionmentioning

confidence: 99%

Simulation studies on the densification behaviour of sintered aluminium preforms

Ahasan¹,

Davidson²,

Khanra³

2013

uujms

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The densification behavior of sintered aluminium has been investigated by performing simulation studies using DEFORM 2D software. The results have been compared with the experimental values. The deformation characteristics of the sintered preforms have been studied and the relationship between the various stresses such as true stress, true strain, hoop stress, hoop strain, hydrostatic stress, hydrostatic strain, effective stress, effective strain and relative density in both the experimental and simulations has been discussed for uniaxial, plane stress and triaxial stress state conditions. A good agreement is found between the experimental and simulation results.

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“…The true effective stress ( eff ) can be determined from the following expression in terms of cylindrical coordinates as explained elsewhere [23]:…”

Section: Cold Workability Behaviormentioning

confidence: 99%

“…The cold workability and the strain hardening behavior of porous P/M composites under uniaxial, plane and triaxial conditions were elaborately analysed and discussed in the previous works by Narayanasamy et al [22][23][24][25]. Their results have shown that the workability behavior of metals/alloys/composites of P/M components depends on the aspect ratio, the preform geometry, the particle size and the percentage of reinforcement for the composites, the die geometry, the lubricants, and the compacting load.…”

Section: Introductionmentioning

confidence: 99%

“…However, this is not the aim of the present work, instead, to study the effect of grain refinement on the cold workability and its strain hardening behavior of AA 6061-10 wt.% TiO 2 composite via MA. According to the findings of Narayanasamy et al [22][23][24][25], porous P/M material during cold working not only experiences the usual strain hardening but also experiences 'geometrical work-hardening (GWH)' (due to a continued increase in density which leads to the enhancement in area of the cross-section) and 'matrix work-hardening (MWH)' (due to continuous increase in strength of the matrix with increase in strain). In general, GWH mainly depends on stress required for closing of pores during compressive plastic deformation [22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of strengthening mechanisms on cold workability and instantaneous strain hardening behavior during grain refinement of AA 6061-10wt.% TiO2 composite prepared by mechanical alloying

Sivasankaran

Sivaprasad

Narayanasamy

et al. 2010

Journal of Alloys and Compounds

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Effect of particle size on new constitutive relationship of aluminium–iron powder metallurgy composite during cold upsetting

Cited by 31 publications

References 18 publications

Workability behaviour of Cu-TiB2 powder-metallurgy preforms during cold upsetting

Workability behaviour of Cu-TiB2 powder-metallurgy preforms during cold upsetting

Simulation studies on the densification behaviour of sintered aluminium preforms

Effect of strengthening mechanisms on cold workability and instantaneous strain hardening behavior during grain refinement of AA 6061-10wt.% TiO2 composite prepared by mechanical alloying

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