Effect of SiC particle size and content on strain-based pore closure rate studies on Al–SiC P/M composites during cold upsetting

Narayanasamy, R.; Ramesh, T.; Prabhakar, M.

doi:10.1007/s00170-009-2196-3

Cited by 11 publications

(12 citation statements)

References 25 publications

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“…[20][21][22][23][24][25] For example, Wang et al, 20) Hamzah et al 21) and Ji et al 19) simulated micro pore closure during metal forming such as rolling using the finite element simulation. All of them have concluded that high hydrostatic stress is favorable for micro pore closure.…”

Section: Mechanical Requirement For Micro Pore Closurementioning

confidence: 99%

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Four-Dimensional Annihilation Behaviors of Micro Pores during Surface Cold Working

Toda

Yamaguchi²,

Nakazawa

et al. 2010

Mater. Trans.

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The annihilation behavior of micro pores in an aluminum alloy casting during surface cold working was continuously observed using the synchrotron radiation microtomography. To analyze micro pore annihilation behavior, the displacement of artificially dispersed particles was measured and thereby local strain distributions were mapped in high-density. A peening treatment annihilated most of the micro pores with a diameter of over 10 mm in the upper part of the specimen that could initiate fatigue cracks. The annihilation behavior of the micro pores could be understood as a function of effective strain locally accumulated around them, and not as a function of local hydrostatic strain. The effective strain varied significantly, with some large pores remaining where local effective plastic strain was relatively low. The complete annihilation of large pores in the surface layer suggests that the application of sufficiently long surface cold working is effective in improving the high-cycle fatigue properties.

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Section: Mechanical Requirement For Micro Pore Closurementioning

confidence: 99%

“…22) Nicolaou et al interpreted micro pore closure during hot working using a simple micromechanical model that predicts strain partitioning between soft and hard grains. 23) They have claimed that stress ratio, m = eff , where m is mean stress and eff is effective stress, is crucial for micro pore closure.…”

Section: Mechanical Requirement For Micro Pore Closurementioning

confidence: 99%

Four-Dimensional Annihilation Behaviors of Micro Pores during Surface Cold Working

Toda

Yamaguchi²,

Nakazawa

et al. 2010

Mater. Trans.

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“…The assumption can be stated for biaxial stress state condition as r r ¼ 0, however for triaxial stress state condition, it follows as r r ¼ r h . The expression for change in hoop strain, de h , and axial strain, de z , respectively, described elsewhere [8] that follows to be…”

Section: Secondary Operationsmentioning

confidence: 99%

“…At this instant, a fresh material comes forward for bond formation through the closing pore surfaces. The flow of porosities and materials in upset forging leads to densification of preforms, which creates strengthening in the material flow direction [8].…”

Section: Introductionmentioning

confidence: 99%

Deformation Study of Sintered Iron–Carbon–Silicon–Copper Steel Compacts during Cold Forging

Ananthanarayanan

Mehta

2014

Materials and Manufacturing Processes

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Cylindrical preforms of 0.4 initial aspect ratio with 86 AE 1% initial theoretical density has been prepared for iron-0.8%carbon-1%silicon with 0.4% and 1.2% copper added steel preforms through classical powder metallurgy route. These preforms are then subjected to secondary deformation such as cold upsetting to evaluate the deformation characteristics. The cold upsetting is carried out in an incremental step of 0.04 MN under two different frictional media using 100 tons capacity hydraulic press. Plasticity theories have been portrayed for various stresses, strains and Poisson's ratio under triaxial condition. The results revealed that the compositional effect on deformation is quite evident under dry friction condition than at graphite employed lubricant condition; on the other hand, both the friction condition shows a phenomenal effect on densification characteristics. Further, it is found that increase of copper content and frictional condition proportionally increases axial and hoop stress but there is a nil effect on mean stress.

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“…The secondary processing techniques are contributed to refine the grain structure and improve physical properties of metals [5]. Among the various processes powder-forging is acost and material-saving one, also having betterd imensiona nd weight control [6]. The selection of reinforcement material is veryi mportantt oo btain improved properties of metal matrix composites.…”

Section: Introductionmentioning

confidence: 99%

Effect of TiO₂ in aluminum matrix on workability behavior of powder metallurgy composites during cold upsetting

Ravichandran¹,

Sait²,

Anandakrishnan

2014

International Journal of Materials Research

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Effect of TiO 2 in aluminum matrix on workability behavior of powder metallurgy composites during cold upsetting Aluminum-based metal matrix composites withv arious weight percentages (0, 2.5, 5, 7.5, and 10) of TiO 2 reinforcementw eres ynthesized by means of powder metallurgy and theirw orkability behavior under triaxial stress-state conditions was completely studied during cold upsetting. Green cylindrical compactswere made using a400 kN hydraulic press with suitable punch and die, sintered at (590 ±10) 8 Cf or ap eriod of 3h,f urnace cooled and machinedtoobtain samples with 0.5 aspect ratio. The cold upset tests were carriedo ut in steps of 10 kN and the results were studied for the workability behavior of the composites. The formability stress index ( b )a nd stress ratio parameters ( r z / r eff ), ( r m / r eff ), and ( r h / r eff )w ere calculated for all composites and correlated with true axial strain(e z ). It was observed that the addition of TiO 2 to the Al matrix material increases the stress ratio parameters and formability stress index ( b ).

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Effect of SiC particle size and content on strain-based pore closure rate studies on Al–SiC P/M composites during cold upsetting

Cited by 11 publications

References 25 publications

Four-Dimensional Annihilation Behaviors of Micro Pores during Surface Cold Working

Four-Dimensional Annihilation Behaviors of Micro Pores during Surface Cold Working

Deformation Study of Sintered Iron–Carbon–Silicon–Copper Steel Compacts during Cold Forging

Effect of TiO₂ in aluminum matrix on workability behavior of powder metallurgy composites during cold upsetting

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Effect of SiC particle size and content on strain-based pore closure rate studies on Al–SiC P/M composites during cold upsetting

Cited by 11 publications

References 25 publications

Four-Dimensional Annihilation Behaviors of Micro Pores during Surface Cold Working

Four-Dimensional Annihilation Behaviors of Micro Pores during Surface Cold Working

Deformation Study of Sintered Iron–Carbon–Silicon–Copper Steel Compacts during Cold Forging

Effect of TiO2 in aluminum matrix on workability behavior of powder metallurgy composites during cold upsetting

Contact Info

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Effect of TiO₂ in aluminum matrix on workability behavior of powder metallurgy composites during cold upsetting