Sintering Behaviour of Cemented Tungsten Carbide and Steel Bilayer

• Published in: Key engineering materials Vol. 740; pp. 60 - 64
• Main Authors: Matori, Khamirul Amin, Ojo-Kupoluyi, Oluwatosin Job, Mohd Tahir, Suraya, bin Baharudin, B.T. Hang Tuah, Anuar, Mohd Shamsul, Mohamed Ariff, Azmah Hanim
• Format: Journal Article
• Language: English
• Published: Zurich Trans Tech Publications Ltd 01.06.2017
• Subjects: Bond strength; Bonding strength; Cemented carbides; Delamination; Drilling; Hardness; Integrity; Machining; Powder metallurgy; Shrinkage; Sintering; Strain rate; Toughness; Tungsten carbide; Tungsten steels; Mismatch Strain; Carbon Content; Powder metallurgy; Bilayer
• ISSN: 1013-9826; 1662-9795; 1662-9795
• DOI: 10.4028/www.scientific.net/KEM.740.60

The target of processing bimaterial components by cost effective powder metallurgy is to combine unique properties from different parts of the component. Differential shrinkage rate and more often, radial mismatch which is more consistent in bilayer owing to sintering conditions (time, rate, temperature etc.) is known to compromise the interfacial bond strength and integrity of these components. Therefore, the aim of this study is to analyze the sintering compatibility and evaluate the mismatch strain in cemented tungsten carbide (WC-Fe-C) and steel (Fe-W-C) bilayer processed through powder metallurgy (PM) to combine the hardness and toughness properties applicable in machining industries for drilling tools. Through geometrical measurement, mismatch strain rate between layers at different sintering temperatures was calculated and a value as low as 13.7% was observed at the interfacial zone of MC–0.2 specimen sintered at 1280°C indicating a stronger bond between layers compared to those sintered at 1290°C and 1295°C where a huge mismatch was found increasing the tendency for delamination.