Influence of temperature on the forming limit diagrams of sintered P/M preforms of steel

Chakravarthy, P.; Chakkingal, Uday; Venugopal, P.

doi:10.1016/j.msea.2007.08.023

Cited by 10 publications

(24 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other side, the value of K a increases with increase in the value of preforms IRD. The same kind of results is obtained by the previous researchers [21,22,29]. Also, the K a and n a values increases with increase in the amount of Ti contents in the composite due to the more number of inherent porosity present in the preforms.…”

Section: Influence Of Titanium On Fldsupporting

confidence: 85%

“…Table 1 shows the initial preforms RD for various Al-Ti composites at different compaction pressures. It is observed from Table 1 that the preforms RD increases with the increase in the compaction pressures irrespective of the compositions of Ti particles in the Al and the RD of the sintered Al-Ti components decreases with the increase in the percentages of Ti contents in the Al due to the effect of porosity [21,22]. The maximum values of RD for various Al-Ti preforms at various compaction pressures after deformation are shown in Table 2, and it is noticed that the values of the final RD increases with the increase in the compaction pressures and the values of the final RD decreases with the increase in the percentages of Ti contents in the Al matrix due to the variation in porosity [21,22].…”

Section: Cold Upsetting Testmentioning

confidence: 97%

“…The higher amount of deformation (true axial strain) is obtained for Al-2% Ti preforms due to less amount of porosity and the amount of deformation is lower for other compositions (Al-4% Ti and Al-6% Ti) due to more amount of porosity. Table 3 shows the result of true axial strain at fracture for various Al-Ti composites at different compaction pressures, and it is found that the true axial strain at failure increases with the increase in the compaction pressures and the values of failure strain decreases with the increase in the compositions of Ti contents in the Al matrix due to the variation in porosity [21,22].…”

Section: Cold Upsetting Testmentioning

confidence: 99%

“…Hence, in most of the industry, the forming process is executed in a safe region without any danger of failure. The researchers [21,22] have generated the FLD of various sintered P/M components through finding the critical transition density (CTD). The CTD divides the FLD into two zones, namely safe and failure, to produce good products.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of titanium in aluminium matrix on densification and forming limit of P/M composites during upsetting process

Tharmaraj

Davidson

2020

J Braz. Soc. Mech. Sci. Eng.

View full text Add to dashboard Cite

The present work investigates the densification and forming limit of sintered porous aluminium-titanium preforms for various relative densities and titanium particles. The compacts of 1 aspect ratio with 2-6% of titanium contents in aluminium matrix for various relative densities were prepared through powder metallurgy route by applying suitable powder forming pressures. A sequence of the cold upsetting test has been carried out using 0.5 MN capacity of hydraulic press machine at 0.1 s −1 strain rate. The relation between true axial strain and preforms relative density was plotted, and the influence of titanium and relative density on the densification curve was investigated at various compaction pressures. The specimen properties like apparent strain hardening exponent (n a) and apparent strength coefficient (K a) was determined through stepwise incremental deformation tests. The critical transition density (CTD) vide forming limit diagram was determined from the plot of n a and K a concerning the preforms relative density, and it was found to be 85.9%, 87.7% and 88% for 2%, 4% and 6% of titanium in the aluminium matrix. The CTD values of porous aluminium-titanium preforms were compared with those of the previous work of porous aluminium-copper preforms under the same compositions. Also, the average grain size of the components was determined and it is observed that 2% of titanium contains a larger grain size compared to other compositions. Hence, a higher forming limit was obtained in 2% of titanium reinforced with aluminium matrix.

show abstract

Section: Influence Of Titanium On Fldsupporting

confidence: 85%

Section: Cold Upsetting Testmentioning

confidence: 97%

Section: Cold Upsetting Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of titanium in aluminium matrix on densification and forming limit of P/M composites during upsetting process

Tharmaraj

Davidson

2020

J Braz. Soc. Mech. Sci. Eng.

View full text Add to dashboard Cite

show abstract

“…It has been identified that significant number of engineering components and parts were made from the shaped and sintered metal powders. This processing technique has become more important as it provides a lot of advantages than conventional fabrication techniques such as casting, forging, machining, etc [5]. This technique is better for the production of mechanical components with high precision compared to other production technologies [6].…”

Section: Introductionmentioning

confidence: 99%

On the Effect of Carbon Content to the Mechanical Properties and Microstructure of Green Compacts Formed at above Ambient Temperature

Rahman¹,

Nor²,

Rahman³

2011

International Journal on Advanced Science, Engineering and Information Technology

View full text Add to dashboard Cite

Friction force is generated during the generation of green compacts from metal powder, which obviously gives adverse effect to the mechanical properties and microstructure of the green compacts. In this study, fine carbon powder is used to minimize the interparticle as well as die wall frictions and as alloying element hence high density yet defect-free near-net shape or net shape mechanical components can be produced. Powder forming at elevated temperature is a relatively new technology hence the effect of carbon content is not fully explored yet. Therefore, a lab scale warm compaction rig is designed and fabricated which enabled the generation of green compacts at different forming load and temperature. The powder mass was prepared by mechanically mixing iron ASC 100.29 powder with different weight percent of fine carbon powder for different duration of time. The prepared powder mass was formed at different compaction temperature to generate green compacts for the purpose of mechanical testing and microstructure evaluation. The results revealed that the mechanical properties and microstructures of green compacts are affected by the carbon content, mixing time, as well as forming temperature. From this study, the suitable carbon content, mixing time, and forming temperature are identified for the production of high quality mechanical components.

show abstract

Effect of Selective Heating on Formability and Densification of Powder Metallurgy Preforms During Upsetting

Tharmaraj

Davidson

Subbu

2019

Trans Indian Inst Met

View full text Add to dashboard Cite

Influence of temperature on the forming limit diagrams of sintered P/M preforms of steel

Cited by 10 publications

References 7 publications

Effect of titanium in aluminium matrix on densification and forming limit of P/M composites during upsetting process

Effect of titanium in aluminium matrix on densification and forming limit of P/M composites during upsetting process

On the Effect of Carbon Content to the Mechanical Properties and Microstructure of Green Compacts Formed at above Ambient Temperature

Effect of Selective Heating on Formability and Densification of Powder Metallurgy Preforms During Upsetting

Contact Info

Product

Resources

About