In high pressure aluminum casting, the cylinder and especially the piston are in constant contact with liquid aluminum at about 700oC. The durability of the cylinder and piston is determined by two factors. Therefore, in addition to the requirement of high wear resistance, the part must also avoid sticking to aluminum during casting. The cylinder

Nitriding occurs when N atoms created by gas, liquid, plasma diffuse into the steel. Depending on the N atom content and temperature, the phases formed in nitriding follow the phase diagram as shown in Figure 1 below: Figure 1. Fe-N diagram The nitriding layer consists of a white layer with high hardness but porous, followed