中国激光, 2009, 36 (12): 3149, 网络出版: 2009-12-18   

Laser Welding,Microwelding,Nanowelding and Nanoprocessing(Invited Paper) 下载: 771次

Laser Welding,Microwelding,Nanowelding and Nanoprocessing(Invited Paper)
A. Hu 1,*S. K. 2M. I. 1Y. Zhou 1
作者单位
1 Department of Mechanical and Mechatronics Engneering,University of Waterloo,200University Avenue West,ON,N2V 2V6,Canada
2 Department of Mechanical Engineering,Indian Institute of Technology-Kharagpur,Kharagpur 721302,India
摘要
Abstract
Laser has been widely applied for advanced material processing,such as welding of advanced high strength steels (AHSS) for automotive applications and Pt,Ti,and Nitinol alloys for medical applications. Recently,ultrafast pulse laser,especially femtosecond laser,is identified as powerful tools for joining and surface engineering of nanomaterials. This paper reviews our research on these fields at the Centre of Advanced Materials Joining,University of Waterloo. Representative conclusions are listed for laser material processing at three continuing scales. 1) For AHSS welding,a thin Al layer can dramatically enhanced the weldability of galvannealed AHSS. The movement of the welding line and softening in the vicinity has significantly influence on global mechanical properties in dual phase (DP) and transformation induced plasticity (TRIP) steels. The increase of the strength ratio decreases the formability and results in the non-uniform strain distribution. 2) For medical micro-welding,oxygen is found to be a key role for welding strength and microstructure. The formation of intermetallics reduces the relative ductility and increases the susceptibility of cracking. Different laser processing parameters can significantly influence weld mechanical performance. 3) For femtosecond laser nanofabrication,the joining of Au nanoparticles is successfully achieved by controlling laser energy. Surface nanostructure of Ag induced by femtosecond laser irradiation can work effective probes for surface enhanced Raman spectroscopy.

, , , . Laser Welding,Microwelding,Nanowelding and Nanoprocessing(Invited Paper)[J]. 中国激光, 2009, 36(12): 3149. A. Hu, S. K., M. I., Y. Zhou. Laser Welding,Microwelding,Nanowelding and Nanoprocessing(Invited Paper)[J]. Chinese Journal of Lasers, 2009, 36(12): 3149.

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