Optimization of Fe-Co-Ni Binder Ratio and Corrosion Behavior Study in Cemented Carbide
Cemented carbide known as hardmetal is a composite of Tungsten Carbide(WC)in binder matrix of cobalt(Co)forming a metallurgical bond during liquid phase sintering.Because of its unique combination of hardness and toughness,WC-Co is widely used as tool material in metal forming and metal cutting industries.Cobalt is the binder that has a good wetting property with tungsten carbide.However alternate binder metals are being explored in combination with cobalt to study the mechanical behavior of cemented carbide.This paper discusses the partial substitution of Cobalt binder with Nickel and Iron and its effect on microstructure,hardness,carbon balance in the alloy and corrosion.WC-15%(Co,Ni,Fe)binder with varying Co and Ni ratios with fixed Fe ratio was compared with WC-15%Co binder.Since iron is corrosive in nature,electrochemical properties become a prime requirement and hence corrosion behavior was compared in different electrolytes.Potentio-dynamic polarization was carried out to understand the corrosion rate of different binder ratios in Brine,Water based coolant(4%),NaHCO3(100 ppm),NaNO3(50ppm),Na2SO4(250 ppm)and mix of sodium salt solution.Electrochemical Impedance Spectroscopy investigation was also done to know the corrosion resistance of varying binder ratios in different electrolytes and compared with 15%Co binder.
Tungsten carbide (WC) Alternate binder Corrosion resistance Polarization
Vaishali Jagannath Shivaram G. Prabin A. Ramesh S.Rao Sudarshana Shetty Shashikumar S.
Kennametal India Limited,Bangalore,Karnataka,560073,India
国际会议
北京
英文
13-19
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）