Energy feedthrough and microstructure evolution during direct laser peening of aluminum in femtosecond and picosecond regimes

2021 ◽  
Vol 130 (1) ◽  
pp. 015104
Author(s):  
A. Nakhoul ◽  
A. Rudenko ◽  
X. Sedao ◽  
N. Peillon ◽  
J. P. Colombier ◽  
...  
Keyword(s):  
Microstructure Evolution ◽  
Laser Peening ◽  
Direct Laser

Experimental Investigation on Laser Peening of Additively Manufactured Ti6Al4V Alloy

2019 ◽  
Author(s):  
Yongxiang Hu ◽  
Mengqi Lai ◽  
Zhenqiang Yao
Keyword(s):  
Surface Layer ◽  
Ti6al4v Alloy ◽  
Laser Deposition ◽  
Laser Peening ◽  
Laser Additive Manufacturing ◽  
Maximum Value ◽  
Average Porosity ◽  
Direct Laser ◽  
Critical Components ◽  
Compressive Residual Stresses

Abstract Laser additive manufacturing is widely utilized to fabricate Ti6Al4V alloy, but post-processing is necessary to improve its performance for fatigue resistance of some critical components. This paper proposes laser peening (LP) as an effective way to improve the surface integrity of Ti6Al4V alloy fabricated by direct laser deposition (DLD). After laser peening, little difference of surface roughness is observed. Compressive residual stresses are induced on the top surface layer. The maximum value of compressive residual stress is about −520 MPa and the compressive state extends to the depth of 0.60 mm. In addition, the relative densities of specimen are measured using the Archimedes method. The average porosity is observed to decrease due to plastic deformation at the surface layer. Results of fatigue test show that the service cycle can be improved about three times.

scholarly journals Residual Stress Distribution and Microstructure Evolution of AA 6061-T6 Treated by Warm Laser Peening

Metals ◽  
2016 ◽  
Vol 6 (11) ◽  
pp. 292 ◽  
Author(s):  
Shu Huang ◽  
Zuowei Wang ◽  
Jie Sheng ◽  
Emmanuel Agyenim-Boateng ◽  
Muxi Liu ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Microstructure Evolution ◽  
Residual Stress Distribution ◽  
Laser Peening

Microstructure Evolution and Surface Strengthening Mechanism of TC6 Titanium Alloy by Laser Peening

2017 ◽  
Vol 37 (9) ◽  
pp. 0914001
Author(s):  
杨祥伟 Yang Xiangwei ◽  
周建忠 Zhou Jianzhong ◽  
盛 杰 Sheng Jie ◽  
孟宪凯 Meng Xiankai ◽  
黄 舒 Huang Shu ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Microstructure Evolution ◽  
Strengthening Mechanism ◽  
Laser Peening ◽  
Surface Strengthening

Investigation on the process and microstructure evolution during direct laser metal deposition of 18Ni300

2018 ◽  
Vol 24 (6) ◽  
pp. 964-972
Author(s):  
Bo Chen ◽  
Yuhua Huang ◽  
Tao Gu ◽  
Caiwang Tan ◽  
Jicai Feng
Keyword(s):  
Grain Size ◽  
Additive Manufacturing ◽  
Microstructure Evolution ◽  
Metal Deposition ◽  
Deposition Method ◽  
Laser Metal Deposition ◽  
Content Type ◽  
Direct Laser ◽  
Single Trace ◽  
Direct Laser Metal Deposition

Purpose Additive manufacturing is a fabrication technology with flexibility and economy. 18Ni300 is one of maraging steels with ultra-high strength, superior toughness, so it is an excellent candidate of structural material. This paper aims to explore the feasibility of using direct laser metal deposition method to fabricate18Ni300, and the evolution of its microstructure and defects is studied. Design/methodology/approach The experiments were conceived from single-trace-single-layer (STSL) test to multi-trace-multi-layers (MTML) test via single-trace-multi-layers (STML) test. The microstructure, defects and mechanical properties were analyzed. Findings The STML results showed that the columnar/equiaxed transformation occurred at the top part and the grain size increased with the layer number increasing, and it was explained by an innovative attempt combining columnar/equiaxed transformation model and the change of grain size. The MTML test with the interlayer orthogonal parallel reciprocating scanning pattern resulted in the grain growing along orthogonal directions; with the increase of overlap rate, the length and the area of the columnar grain decreased. What is more, the later deposition layer had lower micro-hardness value because of heat history. Originality/value Direct laser metal deposition method was a novel additive manufacturing method to manufacture 18Ni300 components, as 18Ni300 maraging steel was mainly manufactured by selective laser melting (SLM) method nowadays. It was useful to manufacture maraging steel parts using direct laser deposition method because it could manufacture larger parts than SLM method. Influence of processing parameters on forming quality and microstructure evolution was studied. The findings will be helpful to understand the forming mechanism of laser additive manufacturing of 18Ni300 components.

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