Title :
Surface modification of roll by pulsed ND:YAG laser: bump formation caused by martensitic transformation
Author :
Yunfeng, He ; Dong, Du ; Bo, Sui ; Lijuan, Xiong ; Hua, Zhang
Author_Institution :
Dept. of Mech. Eng., Tsinghua Univ., Beijing, China
Abstract :
The morphologies of roll surfaces are modified with pulsed Nd:YAG laser and characterized by topography measuring instrument (WYKO-16 DRT2TC). Sombrero shaped bumps with diameters 230-250 μm and heights 2-4 μm are produced by out of focus laser beam. A quantitative model is proposed to predict the bump formation during martensitic transformation. The results show: the bump height caused by martensitic transformation is very small. The key factor of macroscopic bump formation on roll surface during laser texturing is surface tension of molten metal.
Keywords :
laser materials processing; martensitic transformations; neodymium; solid lasers; surface morphology; surface tension; surface texture; surface topography; surface treatment; 2 to 4 mum; 230 to 250 mum; WYKO-16 DRT2TC; YAG:Nd; YAl5O12:Nd; bump formation; laser beam; laser texturing; martensitic transformation; pulsed ND:YAG laser; roll surface modification; surface tension; topography measuring instrument; Instruments; Laser beams; Laser modes; Optical pulses; Predictive models; Pulse measurements; Surface emitting lasers; Surface morphology; Surface texture; Surface topography;
Conference_Titel :
Advanced Optoelectronics and Lasers, 2003. Proceedings of CAOL 2003. First International Conference on
Print_ISBN :
0-7803-7948-9
DOI :
10.1109/CAOL.2003.1250540
