Influence of machining conditions on the microhardness and microstructure of Hastelloy C-276
Keywords:
Turning, alloy, machinability, microhardnessAbstract
This work investigates the influence of machining conditions on microhardness, surface hardness and microstructure during turning of Hastelloy C-276, applied in the production of parts for the nickel industry. For this, a study was carried out on the variation of the surface hardness of the piece as a function of the main cutting time and of the microhardness as a function of the radius of the tool. The results showed that during the turning of the Hastelloy C-276 alloy there is a statistically significant relationship between the mean HRC hardness and the main cutting time. It was verified from the analysis of the microstructure that the increase in Vickers microhardness is caused by the effect of acrimony that causes a hardening of the layer of material immediately below the cut surface and therefore a decrease in the life of the too, and the machinability of the material. It was shown that, during turning, chips are formed in strips of great length and small thickness, which are typical of ductile materials that are difficult to machine.Downloads
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