Research the Influence of Technological Parameters on the Hardness of Detail When Surface Hardening of Steel 9XC by Laser ND:YAG

Hardening surface is the method using the heat source (oxy-axetylen, plasma, electric induction with high frequency, laser…) to heat surface with the defined depth to the phase transition temperature, after that to make quickly to create a high hardness and abrasion resistance surface material layer. Therefore, the hardness of the detail received after surface hardening is one of the important factors that determine the quality of the product. This paper investigates the influence of technological parameters such as laser power, laser spot diameter on the workpiece surface, laser head movement speed to hardness when surface hardening of 9XC steel by laser ND: YAG laser. From the research results, the technologists can choose the technology factors to suit the requirements of the product.