Study of Microstructure and Grain Size Effect on Superficial Hardening of AISI1045 within High Efficiency Deep Grinding

This work outlines the influence of microstructure and grain size on surface hardening within high efficiency deep grinding (HEDG). To do this, different samples with various microstructure and grain size are prepared through specific heat treatments, then they are undergone the grinding operation with constant operating conditions. Finally, the variations of microhardness are recorded. It is observed that by increasing the primary hardness of material the surface hardening amount is increased. But this trend is not observed for super hard material and instead, hardening percent is decreased after a critical primary hardness. This hardening amount is more than for fine grain materials in comparison with coarse grain materials. The rolled samples show the same manner like non-rolled samples. It is found that grinding in direction of elongated grains, resultes in increasing superficial hardening in comparison with that of grinding is perpendicular to elongated grains.