Improve hardness and microstructure on S45C by annealing and shot peening processes

The industrial world is currently overgrowing the need for JIS S45C as structural steel increases, used to manufacture machine components. Efforts to improve the mechanical properties of steel can use heat treatment and surface treatment. One of the surface treatments that is often used in the industrial world is shot peening. This study aims to determine the effect of annealing and shot peening on S45C steel on hardness and microstructure. The method used is annealing treatment and pressure variations on shot peening. The effect of treatment is indicated by changes in the hardness test results on the surface and transverse and the microstructure of the treatment results. The result is a change in the value of hardness and microstructure changes in JIS S45C from the effect of annealing and shot peening treatment. The highest hardness in the annealing and shot peening treatment with a pressure of 7 bar was 285.5 HV. The shot peening treatment causes the grains to become more acceptable to the subsurface depending on the distance from the surface to the surface depth. These changes cause the surface and subsurface of JIS S45C carbon steel to increase mechanical properties.