Microstructure and mechanical properties of in-situ synthesized TiB whiskers reinforced titanium matrix composites by high-velocity compaction

High-velocity compaction of titanium powder and process characterization

Effects of annealing on high velocity compaction behavior and mechanical properties of iron-base PM alloy

Influence of particle size on property of Ti–6Al–4V alloy prepared by high-velocity compaction

An iron based alloy powder (Fe–2.0Ni–1.0Cu–0.8Cr–0.5C) was used as raw material to prepare high density iron based alloy by warm die high velocity compaction (WHVC). The effects of warm die on high velocity compaction (HVC) densification behaviour, variations of stress waves and the resulting mechanical properties of iron based alloy were studied. The results show that, under the warm die condition at 100°C, the HVC behaviour of powder changes and the green density improves. Compared with the compacts prepared by HVC, the green density of compacts prepared by WHVC is 0.09–0.27 g cm− 3 higher at the impact velocity range of 6.2–8.7 m s− 1. The green density of compacts prepared by WHVC reaches 7.62 g cm− 3 at 7.9 m s− 1. The compacts were sintered at 1150°C in H2 atmosphere. The tensile strength, yield strength and hardness of the heat treated samples reach 1571 MPa, 1360 MPa and 51.2 HRC respectively.

Effects of warm die on high velocity compaction behaviour and mechanical properties of iron based PM alloy

In the search for PM components with improved mechanical properties, high velocity compaction (HVC) offers a significant increase in density, and thus properties, coupled with low production cost. In HVC, density increase is achieved using a very high rammer speed in the pressing operation. To reach even higher densities, SKF has developed a route involving HVC recompaction. The powder is conventionally compacted, pre-sintered to burn off the lubricant, recompacted using HVC and finally sintered traditionally. Using this industrially applicable process, components of density 7·7 g cm−3 can routinely be produced, and potentially even higher density levels. Examples of applications are presented, with typical properties, and research to improve the process further is described.

Christer Fors

Papers

Industrial implementation of high velocity compaction for improved properties