Influence of Process Parameters on Precision of PM Parts

Effect of sintering techniques on the microstructure and tensile properties of nano-yttria particulates reinforced magnesium nanocomposites

“…However, the results indicates that the grain refinement remained as the most effective way to enhance the ductility of magnesium matrix in the developed nanocomposites (see Tables 1 and 2) as the conventionally sintered nanocomposites has significant increment in ductility and the microwave rapid sintered nanocomposites has marginal increment in the ductility. The nominal decrease in ductility in the conventionally sintered nanocomposite with the increasing presence of nano-Y 2 O 3 and is due to the increasing presence of porosity [27] (see Table 1) and reinforcement clustering [28]. It may be noted that ductility of all the nanocomposites prepared in this study remained much superior when compared to pure magnesium (see Table 2).…”

Sintering behaviour of compacted water-atomised iron powder: effect of initial state and processing conditions

“…To distinguish between sintering shrinkages taking place in different regions of the sintering cycle, each dilatometer curve was separated into three principal parts; the (i) ferrite, (ii) austenite and (iii) isothermal sections, similar to previous analyses of dilatometric curves [6,14]. The total shrinkage was taken as the sum of the shrinkages in these regions.…”

“…During the compaction step, various levels of particle rearrangement and deformation are introduced with rotational and translational movements of particles at low compaction pressures and additionally elastic and plastic deformation of particles at higher compaction pressures [2][3][4]. Uniaxial die-compaction also gives rise to green density gradients due to die-wall friction, which may cause distortion and loss of tolerances in the final component during sintering if not controlled properly [5][6][7][8]. On a microstructural level, changes in the pore structure are observed in green compacts, with elongated pores present mainly perpendicular to the compaction direction as the contact areas between the powder particles become larger [9,10].…”

High temperature sintering and its effect on dimensional and geometrical precision and on microstructure of low alloyed steels

“…Dimensional stability is a key factor when producing press and sintered parts. The dimensional precision of green parts is excellent and gets slightly worse after sintering [6]. Researches were carried out using small-batch vacuum furnaces to investigate the influence of high-temperature sintering on the dimensional and geometrical precision of PM parts.…”