Sintered composite gradient tool materials
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Purpose: Development of a new generation of the composite gradient tool materials with the core sintered with the matrix obtained using the powder metallurgy of the chemical composition corresponding to the HS6-5-2 highspeed steel reinforced with the WC and TiC type hard carbide phases with the growing portions of these phases in the outward direction from the core to the surface. Design/methodology/approach: Powder Metallurgy, SEM, X-Ray Microanalysis. Findings: Powder metallurgy processes were used to fabricate the proposed gradient materials, i.e., compacting in the closed die and sintering. The method of sequential pouring of the successive portions of the powder mixes into the die was used to ensure a high ductility of the fabricated material core with the HS6-5-2 steel matrix reinforced with the hard WC and TiC carbides phases, so that portions of powder with the high percentage of the hard carbides phases would form the outer layers of the prepreg. Practical implications: Employment of powder metallurgy for fabricating the steel based tool materials gives the possibility to preserve properties characteristic of the traditional cemented carbides and with the high ductility characteristic of steel, yet better than the traditional sintered high-speed steels obtained with the ASP method. Originality/value: Providing of high properties characteristic of cemented carbides with the high ductility characteristic of steel can be mostly because of the possibility of ensuring the gradients of the chemical composition and properties, cutting simultaneously fabrication costs thanks to savings made on the hard carbide phase, used in the tool surface layer only.
Bibliogr. 15 poz.
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