Effect of water-guided laser machining technology on micro-morphology of 316L stainless steel

Yu Yongfei; Qiao Hongchao; Cao Zhihe; Zhao Jibin; Zhang Yinuo; Wu Jiajun

doi:10.12086/oee.2020.190654

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Yu Y F, Qiao H C, Cao Z H, et al. Effect of water-guided laser machining technology on micro-morphology of 316L stainless steel[J]. Opto-Electron Eng, 2020, 47(11): 190654. doi: 10.12086/oee.2020.190654

Citation:

Yu Y F, Qiao H C, Cao Z H, et al. Effect of water-guided laser machining technology on micro-morphology of 316L stainless steel[J]. Opto-Electron Eng, 2020, 47(11): 190654. doi: 10.12086/oee.2020.190654

Effect of water-guided laser machining technology on micro-morphology of 316L stainless steel

1.
Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang, Liaoning 110016, China
2.
School of Mechanical Engineering & Automation, Northeastern University, Shenyang, Liaoning 110819, China
3.
Institutes for Robotics and Intelligent Manufacturing, Chinese Academy of Sciences, Shenyang, Liaoning 110169, China
4.
University of Chinese Academy of Sciences, Beijing 100049, China

Fund Project: Supported by NSFC-Liaoning Province United Foundation (U1608259) and National Natural Science Foundation of China (51875558)

More Information

Corresponding authors: Qiao Hongchao. E-mail:hcqiao@sia.cn; Zhao Jibin. E-mail:jbzhao@sia.cn

Received Date 02 November 2019

Revised Date 25 December 2019

Published Date 15 November 2020

Abstract

Abstract

Water-jet guided laser (WJGL) machining is a novel processing technology using water beam fibers to guide the laser to machine the work-piece surface. This processing technology has the advantage of almost no micro-cracks, small heat-affected zone, pollution-free, less recast layer, high processing accuracy, parallel cuffing, etc. This work aims to investigate the effect of different WGLM parameters on the micro-morphology of materials and the mechanism between lasers and materials. The experiments for slotting and grooving 316L stainless steel thin samples were used by the WGLM system developed by our research group in this work. The 2D micro-topography after experiments were tested by the Zeiss Vert.A1 metalloscope, and the 3D micro-topography of samples after experiments were tested by the Leica DVM6 optical microscope with the large depth of field & Bruke Contour Elite I white-light interferometer. Experimental results show that a certain width deposition layer can be occurred in the machining region, and the width of deposition layers does not change with the parameter of the machining time and the number of machining times. From the 2D micro-topography of samples, it can be found that the 'd_r' of slotting samples and the 'w_l' of grooving samples also do not change with the machining parameters. From the 3D micro-topography of grooving samples, it can be found that the cross-section shape is inverted trapezoid.
- water-jet guided laser machining /
- 316L stainless steel /
- grooving /
- slotting /
- micro-morphology

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References

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Overview

Overview

Overview:With the increasing of the thrust & thrust weight ratio of aircraft engines, the operating temperature of aero-engine hot components can be reached above 1400 K. In order to ensure the normal working of blades at an extremely high temperature environment, the ceramic/metal gradient thermal barrier coatings and design of gas film cooling holes are selected in general. However, the process for gas film cooling holes of aero-engines has encountered a major challenge due to its complex material structures. Laser machining (LM) and electrical discharge machining (EDM) are usually used for machining gas film cooling holes. The LM technology utilizes the laser thermal effect, so this method has disadvantages of thick molten layer, micro-cracks, laser ablation, etc. Thus, the EDM is selected because it can reduce the thickness of the molten layer. However, EDM cannot guarantee the processing accuracy and the recrystallization would be occurred during the processing, which will affect the serve life of aircraft engines. In addition, the EDM is only applicable to metallic materials. In recent years, ceramic materials have been widely used in the aerospace field. The above two methods are unable to meet processing requirements gradually. Water-guided laser machining (WGLM) is a novel method by using water beam fibers to guide the laser to machine the work-piece surface, which can solve these problems. It has been widely applied in the precise machining field of aerospace, bio-medical, micro-electromechanical, and so on, due to advantages of almost no micro-cracks, small heat-affected zone, pollution-free, less recast layer, high processing accuracy, parallel cuffing, etc. This work aims to investigate the effect of different WGLM parameters on the micro-morphology of materials and the mechanism between lasers and materials. The experiments for slotting and grooving 316L stainless steel thin samples were used by the WGLM system developed by our research group. The 2D micro-topography after experiments were tested by the Zeiss Vert. A1 metalloscope, and the 3D micro-topography of samples after experiments were tested by the Leica DVM6 optical microscope with the large depth of field & Bruke Contour Elite I white-light interferometer. Experimental results show that a certain width deposition layer can be occurred in the machining region, and the width of deposition layer does not change with the parameter of the machining time and the number of machining times. From the 2D micro-topography of the machining region of samples, it can be found that the 'd_r' of slotting samples and the 'w_l' of grooving samples also do not change with the machining parameters. From the 3D micro-topography of the machining region of grooving samples, it can be found that the cross-section shape is inverted trapezoid.