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Materials 2016, 9(6), 482; doi:10.3390/ma9060482

Spark Plasma Co-Sintering of Mechanically Milled Tool Steel and High Speed Steel Powders

1
Department of Industrial Engineering, University of Trento, via Sommarive 9, Trento 38123, Italy
2
Iveco Defence Vehicles, Product Development & Engineering, via Volta 6, Bolzano 39100, Italy
3
K4Sint, via Dante 300–B.I.C., Pergine Valsugana 38057, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Eugene A. Olevsky
Received: 15 May 2016 / Revised: 7 June 2016 / Accepted: 9 June 2016 / Published: 16 June 2016
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Abstract

Hot work tool steel (AISI H13) and high speed steel (AISI M3:2) powders were successfully co-sintered to produce hybrid tool steels that have properties and microstructures that can be modulated for specific applications. To promote co-sintering, which is made difficult by the various densification kinetics of the two steels, the particle sizes and structures were refined by mechanical milling (MM). Near full density samples (>99.5%) showing very fine and homogeneous microstructure were obtained using spark plasma sintering (SPS). The density of the blends (20, 40, 60, 80 wt % H13) was in agreement with the linear rule of mixtures. Their hardness showed a positive deviation, which could be ascribed to the strengthening effect of the secondary particles altering the stress distribution during indentation. A toughening of the M3:2-rich blends could be explained in view of the crack deviation and crack arrest exerted by the H13 particles. View Full-Text
Keywords: mechanical milling; hot work tool steel; high speed steel; spark plasma sintering mechanical milling; hot work tool steel; high speed steel; spark plasma sintering
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Pellizzari, M.; Fedrizzi, A.; Zadra, M. Spark Plasma Co-Sintering of Mechanically Milled Tool Steel and High Speed Steel Powders. Materials 2016, 9, 482.

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