The effect of the laser spots overlap on the structure during square parts quenching of 1.7225 steel

5th International Conference Recent Trends in Structural Materials

Kirschner, V.^1 ; Švec, M.^1 ; Škrétová, A.^1 ; Dvoák, L.^1

VuTS, A. S., Laser Application Center, Svárovská 619, Liberec 11

460 01, Czech Republic^1

关键词: Cooling medium;    Heat treats;    High Speed;    Laser quenching;    Laser spots;    Material processing;    Material's surface;    Modern technologies;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/461/1/012038/pdf
DOI  :  10.1088/1757-899X/461/1/012038

来源: IOP

【 摘 要 】

Laser quenching is a modern technology of material processing. A high speed of the process, extremely high speeds of heating (in order of 1000 °C/s) and absence of cooling medium after heating are the biggest advantages of heat treatment by unconventional technology. Moreover, laser quenching could be in some cases only one possible way how to heat treat the material's surface. This article deals with the problematics of laser spots overlap during square parts quenching. It is necessary to set optimal distance between two neighboring tracks. If this distance is too low, the second pass of the laser can temper the previously hardened track. On the other hand, the stripe completely without heat treatment remains in the surface if a too long distance between the quenching tracks is used. The optimal distance of laser spots at quenching of 1.7225 steel was searched under present research. It was verified that at least 4 mm overlap is needed.