The investigation of surface properties in steels with different composition by boriding process

Today boriding is one of the using methods because the surfaces of machine components protect and their life is long. Boriding surfaces have advantages in industrial applications such as high hardness, corrosion and wear resistance.In this study, surfaces coating by boronizing process were examined corrosion and fracture behavior in AISI 1020, AISI 1040, AISI 4140 and AISI H13 steels. The boronizing process was performed in 820, 860, 900, 940 °C and 2, 4, 6, 8 hours. So the thicknesses of borides were measured.AISI 1020, AISI 1040 and AISI H13 steels boriding in 860, 900 and 2,4 hours were investigated their corrosion behavior by following weight loss. Steels were stayed in H2SO4 solution (vol. 10 %) and artificial seawater during 21 days. It was researched how liquids in media affected boride layers.Also the fracture toughnesses of boride layers (FeB and Fe2B) were calculated via Vickers Indentation technique. It was analyzed how the fracture toughnesses of boride layers in all steels boriding in 860, 900, 940 in 8 hour changed with temperature and boride layers.