scholarly journals Comparative Exemination of the Strengthened and Non- Strengthened NIMONIC Specimens with Laser Shot Peening Method

2018 ◽  
Vol 13 ◽  
pp. 2255-2260
Author(s):  
S. Petronić ◽  
K. Čolić ◽  
B. Đorđević ◽  
Ž. Mišković ◽  
Đ. Katnić ◽  
...  
Keyword(s):  
Shot Peening ◽  
Laser Shot

An Study of Nanoscale Mechanical Twins in GH4169 Alloy by Laser Shot Peening Processing

2021 ◽  
Vol 1027 ◽  
pp. 155-162
Author(s):  
Qiang Wang
Keyword(s):  
Shot Peening ◽  
Electron Backscatter Diffraction ◽  
Laser Shot ◽  
Near Surface ◽  
Refined Grains ◽  
Transmission Electron ◽  
Coarse Grains ◽  
Mechanical Twins ◽  
Backscatter Diffraction ◽  
Gh4169 Alloy

In order to study the mechanism of the fatigue strengthening using laser shot peening in GH4169 alloy, micro-structural and nanoscale mechanical twins (MT) at different depth below the top surface subjected to laser shot peening processing (LSP) were investigated by means of electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) observations. In terms of the experimental observations and analyses, the formation of refined grains and nanoscale MT mechanism at the near surface of GH4169 alloy as a function of LSP treament can be summarized as follows: (i) two direction low density of MTs divide the initial coarse grains into submicron rhombic blocks; (ii) high density of MTs aligned in two directions subdivide the submicron rhombic blocks into nanoscale rhombic MT blocks; (iii) the third direction MT further refine the nanoscale rhombic MT blocks into nanoscale triangular MT blocks; (iv) some of subdivided blocks evolve into refined grains. An ultra-high strain rate induced by ultra-short laser pulse plays a key role in the formation of refined grains and nanoscale MT during plastic deformation of GH4169 alloy subjected to LSP treatment.

Research on Corrosion Resistance and Mechanism of Strengthened Layer on AM50 Mg Alloy Surface Processed by Laser Shot Peening

2011 ◽  
Vol 38 (12) ◽  
pp. 1203001
Author(s):  
陈菊芳 Chen Jufang ◽  
李兴成 Li Xingcheng ◽  
周金宇 Zhou Jinyu ◽  
叶霞 Ye Xia
Keyword(s):  
Corrosion Resistance ◽  
Shot Peening ◽  
Mg Alloy ◽  
Alloy Surface ◽  
Laser Shot

Parameters Optimization of Laser Shot Peening Based on Multi-Island Genetic Algorithm

2010 ◽  
Vol 43 ◽  
pp. 387-390 ◽  
Author(s):  
W. Wang ◽  
Jian Zhong Zhou ◽  
Shu Huang ◽  
Yu Jie Fan ◽  
C.D. Wang ◽  
...  
Keyword(s):  
Genetic Algorithm ◽  
Compressive Stress ◽  
Shot Peening ◽  
Optimization Technique ◽  
Parameters Optimization ◽  
Residual Compressive Stress ◽  
Laser Shot ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Stress And Deformation

Laser shot peening (LSP) has recently received more and more attention as a viable laser processing technology, since it can obtain the desirable residual compressive stress to improve fatigue life of the material by precisely controlling laser parameters. The purpose of this paper is mainly to explore the optimal residual compressive stress in the surface layer during LSP by statistical optimization algorithm. Based on the finite element analysis software ANSYS, Multi-island Genetic Algorithm (MIGA) is adopted to find the best solution of design requirements, the control parameters are laser pulse energy and spot diameter, while the aim parameters are residual compressive stress and deformation values, respectively. The results indicate that the optimal residual compressive stress obtained by integrated optimization technique can significantly improve the mechanical properties of the target after LSP. It provides a guiding importance for parameters optimization in future experimental research and practical application.

scholarly journals Laser Shot Peening to Improve Surface Properties of Precipitation Hardened Aluminum Alloy Al-6061-T6

2014 ◽  
Vol 42 (6) ◽  
pp. 494
Author(s):  
Sathyanesan SATHYAJITH ◽  
Sivaperuman KALAINATHAN ◽  
Sathya SWAROOP
Keyword(s):  
Aluminum Alloy ◽  
Surface Properties ◽  
Shot Peening ◽  
Laser Shot ◽  
Al 6061

Study on Strain Hardening and Fatigue Fracture of AZ31B Magnesium Alloy after Laser Shot Peening

2011 ◽  
Vol 38 (8) ◽  
pp. 0803002
Author(s):  
黄舒 Huang Shu ◽  
周建忠 Zhou Jianzhong ◽  
蒋素琴 Jiang Suqin ◽  
盛杰 Sheng Jie ◽  
徐增闯 Xu Zengchuang ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Strain Hardening ◽  
Fatigue Fracture ◽  
Shot Peening ◽  
Laser Shot ◽  
Az31b Magnesium Alloy

Research on Fatigue Properties of ZK60 Wrought Magnesium Alloy Treated by Laser Shot Peening

2012 ◽  
Vol 49 (8) ◽  
pp. 081403 ◽  
Author(s):  
蒋素琴 Jiang Suqin ◽  
周建忠 Zhou Jianzhong ◽  
吴建华 Wu Jianhua ◽  
裴旭 Pei Xu
Keyword(s):  
Magnesium Alloy ◽  
Shot Peening ◽  
Laser Shot ◽  
Fatigue Properties ◽  
Wrought Magnesium Alloy

Influence of Laser Shot Peening Parameters on the Surface Hardness and Roughness of 7075 Aluminum Alloy

2018 ◽  
Vol 920 ◽  
pp. 83-88
Author(s):  
Jun Hao Zhang ◽  
Xiu Quan Cheng ◽  
Qin Xiang Xia ◽  
Jia Yu Li
Keyword(s):  
Surface Roughness ◽  
Aluminum Alloy ◽  
Shot Peening ◽  
Surface Hardness ◽  
Laser Shot ◽  
7075 Aluminum Alloy ◽  
Alloy Specimen ◽  
Structural Parts ◽  
The Impact ◽  
Overlap Rate

The laser shot peening has the widely application prospect in aircraft structural parts repairment. The influence of laser shot peening parameters on the surface hardness and surface roughness has guiding significance for laser shot peening process. The variation law of surface hardness and surface roughness in the peening area of 7075 aluminum alloy were obtained based on the experiment research. The results show that the surface hardness improves effectively after laser shot peening, and the maximum hardness is 205.4HV, which is improved by 19.49% compared with the original hardness. Besides, the surface roughness of the rough specimen decreases; whereas, those of the smooth specimen increases after laser shot peening. However, both the surface hardness and surface roughness tend to be saturated when the impact times exceeds 3 times or the overlap rate exceeds 50%. Therefore, a good repairment effect can be obtained with 3 impact times and 50% overlap rate for the 7075 aluminum alloy specimen.

Laser Shot Peening of 304 Austenitic Stainless Steel without Protective Coating

2011 ◽  
Vol 699 ◽  
pp. 131-140 ◽  
Author(s):  
S. Sathyajith ◽  
S. Kalainathan ◽  
S. Swaroop
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Protective Coating ◽  
Shot Peening ◽  
Substantial Improvement ◽  
Laser Shot ◽  
Maximum Compressive Stress ◽  
Before And After ◽  
304 Austenitic Stainless Steel

Laser Shot Peening without protective Coating (LPPC) was performed on SS304 austenitic stainless steel using a 300 mJ, 10 ns pulse, 1064 nm wavelength Nd:YAG laser with three different pulse densities. A thin layer of water was used as a confinement layer. The peened specimen was characterised with XRD, AFM and a Profilometer. The stress evaluated at the surface of the laser peened sample shows a maximum compressive stress of 1.6 GPa. The surface roughness and depth profile of microhardness before and after LPPC were investigated.The LPPC region indicate substantial improvement in microhardness and compressive residual stress, with marginal increase of surface roughness.

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