Capsule-free hot isostatic pressing of sintered steel to full density using water atomised iron and Cr-alloyed powder consolidated by cold isostatic pressing
Artikel i vetenskaplig tidskrift, 2021

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.

full density

PM steel

capsule-free hot isostatic pressing

sintering

cold isostatic pressing

Författare

Maheswaran Vattur Sundaram

Höganäs

Eduard Hryha

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Magnus Ahlfors

Quintus Technologies AB

Ola Bergman

Höganäs

Sigurd Berg

Höganäs

Lars Nyborg

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Powder Metallurgy

0032-5899 (ISSN)

Vol. In Press

Ämneskategorier

Keramteknik

Materialkemi

Metallurgi och metalliska material

Styrkeområden

Materialvetenskap

DOI

10.1080/00325899.2021.1966876

Mer information

Senast uppdaterat

2021-08-24