Effect of tungsten equivalent on hardness of heat-treated semi-multi–alloyed white cast irons with 0% carbon balance
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Abstract
This study investigates the effect of tungsten equivalent (Weq) on the hardness of heat-treated multi-alloyed white cast iron with a 0% carbon balance. Specimens with Weq values ranging from 6.0 to 8.0% were prepared. The specimens were annealed at 950°C and cooled in the furnace. The annealed specimens were then austenitized at 1050°C and 1100°C, followed by quenching with fan air. After hardening, the specimens were tempered at temperatures between 400°C and 600°C. The results showed that the microstructure consisted of austenite dendrites and eutectics (g+MC) and (g+M2C), with the (g+M2C) eutectics increasing as the Weq values increased. Hardness in the as-hardened state decreased with increasing Weq values. The tempered hardness curve demonstrated secondary hardening due to the precipitation of secondary carbides and the transformation of austenite to martensite. The degree of secondary hardening (DHs) increased with higher Weq values and austenitizing temperatures. The maximum tempered hardness (HTmax) was achieved at a tempering temperature of 500°C in all specimens. The highest HTmax values, 879 HV30 and 848 HV0.1 were obtained in the 6.7% Weq specimen, hardened at 1100°C and tempered at 500°C.
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References
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