High-Speed Steels Produced by Conventional Casting, Spray Forming and Powder Metallurgy

Rafael Agnelli Mesquita; Celso Antonio Barbosa

doi:10.4028/www.scientific.net/MSF.498-499.244

Paper Titles

The Role of the Apparent Density on the Permeability of Porous Stainless Steel Parts
p.217

Study of the Diamond 5%wt- Cobalt Sintering under the HPHT Lowest Limit
p.225

Pressure Assisted WC-15%wt Co Sintering
p.231

Sinterability of High-Speed Steels M2, M3/2 and T15
p.238

High-Speed Steels Produced by Conventional Casting, Spray Forming and Powder Metallurgy
p.244

Microstructural Characterisation by Scanning Electron Microscopy of Spray Formed Al/SiC_p Matrix Composite
p.251

Consolidation of Compacted Zircaloy Chips via Vacuum Arc Melting - Analysis of the Electric Arc
p.258

Computational Fluid Dynamics Applied to Bradley Hydrocyclones
p.264

Simulation of Spouted Bed Using a Eulerian Multiphase Model
p.270

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High-Speed Steels Produced by Conventional Casting, Spray Forming and Powder Metallurgy

Abstract:

Powder metallurgy (PM) and spray forming (SF) have been reported as important alternative routes for tool steel production. The ability to promote refined and more uniform microstructures is their main advantages, leading to improved properties and larger isotropy. While PM application is a completely established technology, the SF process may be considered as a not totally explored field. Therefore, the present work aimed to study the potential of both processes, focusing at high-speed steel (HSS) production. AISI M3:2 highspeed steel was produced by conventional casting, spray forming and powder metallurgy. Conventional ingots and a 400 mm diameter SF billet were rolled to small diameter bars, with cross section around 110 mm. The PM material was evaluated in the as-HIPed condition, in comparative diameters. Large diameter HSS bars are used mainly in cutting tools, but are also applied in cold work tooling when high wear resistance is required. In the present characterisation, microstructures and bend test analysis were used, both in transverse and longitudinal directions. The results show that the as-HIPed PM material presents finer and more uniform carbide distribution, leading to a complete isotropy and higher toughness than conventional steel. In the SF material, carbides are also finer, have good distribution and the isotropy is considerably higher than that for conventional HSS.