Search results for: K.S. Pandey

Items from 1 to 20 out of 42 results

article

Clinical course in multiple sclerosis patients presenting with a history of progressive disease

K.S. Pandey, S.C. Krieger, C. Farrell, C. Hannigan, more

Multiple Sclerosis and Related Disorders > 2014 > 3 > 1 > 67-71

Determine the likelihood of worsening clinical status in the near-term course of progressive MS and evaluate the predictive validity of our diagnostic impression of progressive forms of MS.Retrospective review of charts from 175 patients seen between 2000 and 2007 who were diagnosed with either primary or secondary progressive multiple sclerosis. Data extracted included demographic factors, neurological...

article

Workability Behaviour of Fe-C-Mo Steel Preforms During Cold Forging

S Narayan, A Rajeshkannan, KS Pandey, S Shanmugam

Journal of Iron and Steel Research International > 2013 > 20 > 9 > 126-130

A systematic method to construct the workability diagram for powder metallurgy (P/M) materials has been proposed. Preforms of Fe-0. 8%C, Fe-0. 8%C-1%Mo and Fe-0. 8%C-2%Mo were prepared to the relative density of 0. 86 with two different geometries through primary operations of P/M processes. Each sintered preform was cold upset forged with incremental compressive loading of 0. 04 MN under three different...

article

Some studies on sintered cold deformed plain carbon alloy steels

A. Rajeshkannan, K.S. Pandey, S. Shanmugam, R. Narayanasamy, more

Materials and Design > 2012 > 33 > Complete > 115-120

Steel of Fe–0.8%C with and without addition of 1.0%Mo were considered for the present investigation. Experimental analysis was studied for attained density against induced strain parameter. Various stress parameters were determined and studied for its behaviour against strain. Instantaneous plastic Poisson’s ratios of were computed and was compared with conventional. All these characteristics were...

article

Effects of laser phase transformation hardening parameters on heat input and hardened-bead profile quality of unalloyed titanium

D.S. BADKAR, K.S. PANDEY, G. BUVANASHEKARAN

Transactions of Nonferrous Metals Society of China > 2010 > 20 > 6 > 1078-1091

Laser transformation hardening (LTH) of unalloyed titanium of 1.6 mm-thick sheet, nearer to ASTM Grade 3 of chemical composition was investigated using 2 kW CW Nd:YAG laser. The effects of laser power (750-1 250 W), scanning speed (1 000–3 000 mm/min) and focal point position (from −10 to −30 mm) on the heat input, and hardened-bead geometry (i.e. hardened bead width (HBW), hardened depth (HD) and...

article

Effect of molybdenum addition on workability of powder metallurgy steels during cold upsetting

R. Narayanasamy, V. Anandakrishnan, K.S. Pandey

Materials Science & Engineering A > 2009 > 517 > 1-2 > 30-36

Ferrous powder metallurgy preforms containing 0%, 0.5%, 1.0% and 1.5% of molybdenum were completely investigated experimentally to study workability behaviour. The formability behaviour of the above-said powder metallurgy sintered steels preforms with aspect ratio of 0.75 under triaxial stress state condition was determined by cold upsetting them with graphite as lubricant. The formability stress...

article

Ring rupture strength and hardness of sintered hot-forged 1.5Mo alloyed carbon steels

S. Shanmugam, K.S. Pandey, Syed Ummer M. Thangal

Journal of Materials Processing Tech. > 2009 > 209 > 7 > 3426-3430

The effect of fractional density and height-to-diameter ratio (aspect ratio) on radial crushing strength for sintered hot-upsetted Fe–0.8%C as well as Fe–0.8%C–0.5%Mo powder metallurgy rings were investigated. Rings of predetermined geometry were machined from the hot deformed preforms of different initial densities. It was found that increasing density of the rings had increased the radial crushing...

article

Effect of carbon content on instantaneous strain-hardening behaviour of powder metallurgy steels

R. Narayanasamy, V. Anandakrishnan, K.S. Pandey

Materials Science & Engineering A > 2008 > 497 > 1-2 > 505-511

Complete experimental investigation on the instantaneous strain-hardening behaviour of powder metallurgy preforms of pure iron and steels containing 0.4% and 0.8% carbon were carried out. The above-mentioned powder metallurgy sintered preforms with two different aspect ratios namely 0.39 and 0.59 were cold upset with graphite as lubricant and their strain-hardening behaviour under triaxial stress...

article

Comparison of workability strain and stress parameters of powder metallurgy steels AISI 9840 and AISI 9845 during cold upsetting

R. Narayanasamy, V. Anandakrishnan, K.S. Pandey

Materials and Design > 2008 > 29 > 10 > 1919-1925

A complete experimental investigation on the workability behaviour of nickel–chromium–molybdenum steel grades namely AISI 9840 and AISI 9845 of powder metallurgy preforms was performed. Cold upsetting of aforesaid composites with different aspect ratios namely 0.42, 0.63 and 0.93 was carried out with graphite lubricant and the formability behaviour of the preforms under triaxial stress-state condition...

article

Effect of carbon content on workability of powder metallurgy steels

R. Narayanasamy, V. Anandakrishnan, K.S. Pandey

Materials Science & Engineering A > 2008 > 494 > 1-2 > 337-342

Workability behaviour of steel powder metallurgy performs containing 0%, 0.4% and 0.8% of carbon were completely investigated experimentally. Cold upsetting of abovementioned powder metallurgy sintered steels preforms with two different aspect ratios namely 0.39 and 0.59 was carried out with graphite as lubricant and the formability behaviour of the preforms under triaxial stress state condition was...

article

Deformation behaviour of sintered high carbon alloy powder metallurgy steel in powder preform forging

A. Rajeshkannan, K.S. Pandey, S. Shanmugam, R. Narayanasamy

Materials and Design > 2008 > 29 > 9 > 1862-1867

Powder preform forging is one of the secondary deformation technique applied to conventionally produced powder metallurgy parts in order to achieve near net shape; therefore to find places in structural and heavy duty applications. Present investigation pertains to evaluate the stress–strain and densification behaviour of Fe–0.8%C–1.0%Si–0.4%Cu steel performs during cold upsetting. Secondary cold...

article

Some investigation on the cold deformation behaviour of sintered iron–0.8% carbon alloy powder preforms

A. Rajesh Kannan, K.S. Pandey, S. Shanmugam

Journal of Materials Processing Tech. > 2008 > 203 > 1-3 > 542-547

Powder metallurgy (P/M) manufacturing route has wide industrial applications due to a host of techno-economic advantages. However, the production of highly dense product for structural application with pore free at open surface is a challenging endeavour for the investigators. Thus, present investigation pertains to describe cold deformation behaviour and to develop forming limits for iron–0.8% carbon...

article

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

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

Materials and Design > 2008 > 29 > 5 > 1011-1026

The strain hardening and the strain rate sensitivity of a material are important phenomenons which are required to be studied during the plastic deformation of any material and these also are the important parameters in the study of workability criteria of the metals. The present investigation has been undertaken to propose the constitutive relationship for porous powder metallurgy parts during upsetting...

article

Some aspects on cold forging of aluminium–iron powder metallurgy composite under triaxial stress state condition

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

Materials and Design > 2008 > 29 > 4 > 891-903

An experimental investigation on the barreling of aluminium with various per cent additive of iron composites, namely, 2%, 4%, 6%, 8% and 10% with different iron particle sizes, namely −53 +45μm, −75 +63μm and −106 +90μm under triaxial stress state condition has been studied in the present work. Sintered aluminium–iron composites with height to diameter ratio of 0.44 were prepared, sintered, furnace...

article

Some aspects on cold forging of aluminium–alumina powder metallurgy composite under triaxial stress state condition

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

Materials and Design > 2008 > 29 > 6 > 1212-1227

An experimental investigation on the cold forging of aluminium–3.5% alumina powder metallurgy composite under triaxial stress state condition has been studied in the present work. Sintered aluminium–alumina composite with three different height to diameter ratios, namely, 0.35, 0.56 and 0.72 with three different initial preform relative densities, namely, 0.72, 0.80 and 0.88 were prepared, sintered,...

article

Effect of geometric work-hardening and matrix work-hardening on workability and densification of aluminium–3.5% alumina composite during cold upsetting

R. Narayanasamy, V. Anandakrishnan, K.S. Pandey

Materials and Design > 2008 > 29 > 8 > 1582-1599

The densification is a measure of deformation in upset forming of Powder Metallurgy (P/M) processes. A complete experimental investigation on the deformation behaviour of aluminium–3.5% alumina powder composite has been discussed for the case of triaxial stress state condition. Cold upsetting of aluminium–3.5% alumina composite with and with no annealing having different initial preform relative density...

article

Some features on hot forging of powder metallurgy sintered high strength 4%titanium carbide composite steel preforms under different stress state conditions

R. Narayanasamy, V. Senthilkumar, K.S. Pandey

Materials and Design > 2008 > 29 > 7 > 1380-1400

In this paper, the authors propose mathematical expressions for the determination of different stress ratio parameters under plane and triaxial stress state conditions. Experiments were carried out to evaluate the hot forging features in the high strength sintered powder metallurgy 4%titanium carbide composite steel performs under different stress states, namely, plane stress and triaxial stress states...

article

Effect of titanium carbide particle addition on the densification behavior of sintered P/M high strength steel preforms during cold upset forming

R. Narayanasamy, V. Senthilkumar, K.S. Pandey

Materials Science & Engineering A > 2007 > 456 > 1-2 > 180-188

Experimental investigation has been carried out to evaluate the effect of titanium carbide addition on the composite steel preforms. The cold upsetting of the composite steel preforms with varying TiC contents, namely, 3% and 4%, and different aspect ratios, namely, 0.42, 0.67 and 1.0, and lubricating conditions namely, nil lubricant, graphite and zinc stearate lubricants, was carried out using 100tonnes...

article

Modelling the effect of particle size and iron content on forming of Al–Fe composite preforms using neural network

N. Selvakumar, P. Ganesan, P. Radha, R. Narayanasamy, more

Materials and Design > 2007 > 28 > 1 > 119-130

Cold upsetting experiments were carried out on sintered Al–Fe composite preforms inorder to model and analyse the formability by simulation using neural network (NN). A model has been developed with a radial basis NN algorithm. The data used were collected by the experimental set up in the laboratory for the sintered Al–Fe composites with the various preform densities, the particle sizes and the aspect...

article

Phenomenon of instantaneous strain hardening behaviour of sintered Al–Fe composite preforms during cold axial forming

R. Narayanasamy, N. Selvakumar, K.S. Pandey

Materials and Design > 2007 > 28 > 4 > 1358-1363

Cold upsetting experiments were carried out on sintered Al–Fe composite preforms in order to evaluate their work-hardening characteristics. Preforms of 92% of theoretical density, with two initial aspect ratios were prepared using a suitable die-set assembly on a 0.6MN capacity hydraulic press. Sintering was carried out in an electric muffle furnace for a period of 1h at 520°C. Each sintered compact...

article

An experimental investigation on strain hardening behaviour of aluminium – 3.5% alumina powder metallurgy composite preform under various stress states during cold upset forming

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

Materials and Design > 2007 > 28 > 4 > 1211-1223

An experimental investigation on instantaneous strain hardening behaviour of aluminium – 3.5% alumina powder metallurgy composite preforms for three different stress state conditions, namely, the uniaxial, the plane and the triaxial has been carried out. Sintered aluminium–alumina composite with three different aspect ratios (height to diameter ratio), namely, 0.35, 0.56 and 0.72 and two different...

Publication date

Set your own date range

INFONA - science communication portal

Search results for: K.S. Pandey

Clinical course in multiple sclerosis patients presenting with a history of progressive disease

Workability Behaviour of Fe-C-Mo Steel Preforms During Cold Forging

Some studies on sintered cold deformed plain carbon alloy steels

Effects of laser phase transformation hardening parameters on heat input and hardened-bead profile quality of unalloyed titanium

Effect of molybdenum addition on workability of powder metallurgy steels during cold upsetting

Ring rupture strength and hardness of sintered hot-forged 1.5Mo alloyed carbon steels

Effect of carbon content on instantaneous strain-hardening behaviour of powder metallurgy steels

Comparison of workability strain and stress parameters of powder metallurgy steels AISI 9840 and AISI 9845 during cold upsetting

Effect of carbon content on workability of powder metallurgy steels

Deformation behaviour of sintered high carbon alloy powder metallurgy steel in powder preform forging

Some investigation on the cold deformation behaviour of sintered iron–0.8% carbon alloy powder preforms

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

Some aspects on cold forging of aluminium–iron powder metallurgy composite under triaxial stress state condition

Some aspects on cold forging of aluminium–alumina powder metallurgy composite under triaxial stress state condition

Effect of geometric work-hardening and matrix work-hardening on workability and densification of aluminium–3.5% alumina composite during cold upsetting

Some features on hot forging of powder metallurgy sintered high strength 4%titanium carbide composite steel preforms under different stress state conditions

Effect of titanium carbide particle addition on the densification behavior of sintered P/M high strength steel preforms during cold upset forming

Modelling the effect of particle size and iron content on forming of Al–Fe composite preforms using neural network

Phenomenon of instantaneous strain hardening behaviour of sintered Al–Fe composite preforms during cold axial forming

An experimental investigation on strain hardening behaviour of aluminium – 3.5% alumina powder metallurgy composite preform under various stress states during cold upset forming

Filter options

Publication date

Content availability

Keywords

Journal

INFONA - science communication portal

Search results for: K.S. Pandey

Add recipient

Sending message cancelled

Are you sure you want to cancel sending this message?

Send message

Filter options

Publication date

Date range setting

Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.

Content availability

Keywords

Journal

Reporting an error / abuse

Sending the report failed

Accessibility options