The study of ternary carbides formation during SPS consolidation process in the WC-Co-steel system


Autoria(s): MACHADO, Izabel Fernanda; GIRARDINI, Luca; LONARDELLI, Ivan; MOLINARI, Alberto
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

18/10/2012

18/10/2012

2009

Resumo

Tungsten carbide has a wide range of applications, mainly cemented carbides made of WC and Co, as wear resistant materials. However, the high cost of WC-Co powders encourages the use of a substrate to manufacture a functionally graded material (FGM) tool made of WC-Co and a tool steel. These materials join the high wear resistance of the cemented carbide and the toughness of the steel. This work deals with the study interaction of the WC-Co and H13 steel to design a functionally graded material by means of spark plasma sintering (SPS). The SPS, a novel sintering technique reaching the consolidation of the powders at relatively low temperatures and short dwell times, is a promising technique in processing materials. In this study, WC, H13 steel, WC-Co, WC-H13 steel and WC-Co-H13 steel bulk samples were investigated using scanning electron microscopy and X-ray diffraction techniques to evaluate the phase transformations involved during SPS consolidation process. The W(2)C and W(3)Fe(3)C precipitation were identified after the SPS consolidation of the WC and WC-H13 steel samples, respectively. The precipitation Of W(4)Co(2)C was also identified in the WC-Co and WC-Co-H13 steel samples. The WC-H 13 steel and WC-Co-H13 steel were also evaluated after heat treatments at 1100 degrees C for 9 h, which enhanced the chemical interaction and the precipitation of W(3)Fe(3)C and W(4)Co(2)C, respectively. (C) 2009 Elsevier Ltd. All rights reserved.

CAPES (Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior)

CNPq (National Counsel of Technological and Scientific Development)

Identificador

INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS, v.27, n.5, p.883-891, 2009

0263-4368

http://producao.usp.br/handle/BDPI/18345

10.1016/j.ijrmhm.2009.05.001

http://dx.doi.org/10.1016/j.ijrmhm.2009.05.001

Idioma(s)

eng

Publicador

ELSEVIER SCI LTD

Relação

International Journal of Refractory Metals & Hard Materials

Direitos

closedAccess

Copyright ELSEVIER SCI LTD

Palavras-Chave #WC-Co #Steel #Spark plasma sintering #Carbides #TUNGSTEN CARBIDE #PLASMA #MICROSTRUCTURE #POWDER #COATINGS #Materials Science, Multidisciplinary #Metallurgy & Metallurgical Engineering
Tipo

article

original article

publishedVersion