Manufacturing full density powder metallurgy gears through HIP:ing

Andersson, Michael; Bergendahl, Magnus; Bjarre, Ulf; Eklúnd, Anders; Gunnarsson, Staffan; Haglund, Sven; Hansson, Hans; Heikkilä, Irma; Khodaee, Alireza; Melander, Arne; Nyberg, Harald; Nyborg, Lars; Strondl, Annika; Sundaram, Maheswaran Vattur

doi:10.1016/j.mprp.2018.12.076

Cited by 3 publications

(1 citation statement)

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“…The recent trends in HIP process developments show the potential for integrating several processes into one such as sintering in a vacuum within the HIP furnace, capsule-free HIP to reach full density, and carburising in HIP [27] or normalising [28] combined with high-pressure gas quenching [29,30]. Besides, consolidation in CIP is not limited to the component size in the same way as die compaction and hence consolidation of the components up to dozens of kilograms is possible.…”

Section: New Possibilities With Isostatic Processingmentioning

confidence: 99%

Capsule-free hot isostatic pressing of sintered steel to full density using water atomised iron and Cr-alloyed powder consolidated by cold isostatic pressing

et al. 2021

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Powder metallurgy (PM) steel with enhanced density is essential for meeting the demands on high strength and high-performance applications. In this study, cold isostatic pressing (CIP) is applied for consolidating water-atomised iron and Cr-alloyed steel powder to reach about 95% densification before sintering. Additionally, the effect of the lubricant and graphite addition on the compressibility of the different base powder types was evaluated. The maximum green densities of ≈7.55 g cm −3 for iron powder and ≈7.45 g cm −3 for Cr-alloyed powder were reached after CIP at 800 MPa. The sintering at 1250°C with added graphite allowed to achieve increased densification to ≈7.60 g cm −3 for the iron and ≈7.50 g cm −3 for Cr-alloyed grades, respectively. These levels were sufficient for surface pore closure, which allowed the application of the capsule-free hot isostatic pressing (HIP) after sintering to reach full density. This approach paves the way for manufacturing large-sized PM components.

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Section: New Possibilities With Isostatic Processingmentioning

confidence: 99%