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Special Issue "Laser Materials Processing Technology"

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A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: 31 May 2023 | Viewed by 3265

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Dr. Liucheng Zhou

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Science and Technology on Plasma Dynamics Laboratory, Air Force Engineering University, Xi'an 710038, China
Interests: coating; tribology; laser strength; fatigue
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Dear Colleagues,

Lasers have been well established as advanced tools in the 21st century, which have the potential to be used to manufacture various materials and obtain anticipated properties. Nowadays, techniques based on lasers, such as laser additive manufacturing, laser polishing, laser shock peening, laser quenching, femtosecond laser technologies, etc., are receiving much attention. Notably, laser manufacturing technologies have great potential to be used as tools to more efficiently process present and forthcoming high-performance components, as well as micro- and nano-fabrication in aerospace, aviation, ship and automobile, etc. However, up until now, many questions have remained regarding both theories and processes, and understanding the relationship between lasers and materials remains challenging. Thus, further investigation in this field is necessary and urgent.

The Special Issue scope embraces interdisciplinary work aimed at understanding and deploying the phenomena and mechanisms between lasers and materials, optimizing laser materials processing technology to obtain improved performance, model the microstructural response to lasers, and find the potential applications in the future.

Dr. Liucheng Zhou
Guest Editor

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Keywords

laser processing
mechanical properties
microstructural modification
model simulation
industrial application

Published Papers (5 papers)

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Research

Open AccessArticle

Optimization of Femtosecond Laser Drilling Process for DD6 Single Crystal Alloy

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Metals 2023, 13(2), 333; https://doi.org/10.3390/met13020333 - 07 Feb 2023

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Abstract

In this paper, we explore the optimal combination of femtosecond laser drilling parameters for micro-hole processing on DD6 single-crystal high-temperature alloy and analyze the significance of parameter variations on the microstructure characteristics of the holes. The L25(56) orthogonal test was performed by controlling six parameters during femtosecond laser ring processing: average power; overlap rate; defocus rate; feed amount; gas pressure; and end position. The significance of the influence of the factors was analyzed by ANOVA, and the parameters were optimized by genetic algorithm. Scanning electron microscopy was performed on the micropores and the salient features of the pores were analyzed. Finally, we calculated the extreme differences and conducted single-factor effect analysis. We conclude that the defocus rate has the most significant level on the hole drilling by femtosecond laser ring processing for DD6 single crystal high-temperature alloy; and the effect of the end position is smaller than others. The optimized parameters are power 6.73 W; overlap 99%, defocus 0 mm; pressure 0.2 MPa; feed 0.02 mm, and end −0.4 mm. Full article

(This article belongs to the Special Issue Laser Materials Processing Technology)

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Open AccessArticle

Research on Wear Resistance of AISI 9310 Steel with Micro-Laser Shock Peening

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Metals 2022, 12(12), 2157; https://doi.org/10.3390/met12122157 - 15 Dec 2022

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Abstract

Improving the wear resistance of turbine engine drive components is crucial. This study presented a new Laser Shock Peening (LSP) technique: Micro-Laser Shock Peening (Micro-LSP) technology for surface modification and strengthening of AISI 9310 steel. The effects of different pulse energies (50 mJ, 150 mJ, 200 mJ) on surface morphology, mechanical properties, and wear behavior were investigated. The results showed that the Micro-LSP treatment reduced the wear rate by 56% to 74%. The dimpled structure induced during the strengthening process increased the surface roughness and reduced the contact area; moreover, the coefficient of friction (COF) was reduced. The treatment also had the effect of reducing the wear rate by collecting abrasive debris and changing some of the sliding wear into rolling wear. The reduced wear rate was a result of the combined effect of the dimpled structure and the hardened layer. In addition, a deeper hardened layer also slows down the onset of wear behavior. Micro-LSP technology offers completely new methods and possibilities for wear reduction. Full article

(This article belongs to the Special Issue Laser Materials Processing Technology)

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Open AccessArticle

Comparison of Submillimeter Spot Ablation of Copper and Nickel by Multipulse Picosecond and Femtosecond Laser

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Metals 2022, 12(11), 1971; https://doi.org/10.3390/met12111971 - 18 Nov 2022

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Abstract

The current transmission and reflection laser ablation micropropulsion modes have the problem of a complex working medium supply system in engineering. Therefore, we propose large-spot laser ablation with a one-dimensional supply mode. In order to verify this ablation mode, a multipulse ablation experiment of submillimeter-scale light spots was carried out on the surface of pretreated copper and nickel under the atmosphere using an ultrafast laser with a pulse width of 290 fs and 10 ps. The results show that femtosecond laser multipulse ablation (FLMA) leads to the grain refinement of copper, the crater quality of the two metals under FLMA is better, and picosecond laser multipulse ablation (PLMA) causes the crater of nickel to form a dense remelting bulge that affects laser absorption; both metals have obvious heat-affected zones after FLMA and PLMA, the heat-affected zones of nickel are 5–10% larger than those of copper, and the ablation depth of copper is deeper. Under the same conditions, the ablation mass of copper is smaller than that of nickel, and the specific impulse performance of laser ablation micropropulsion is better. Full article

(This article belongs to the Special Issue Laser Materials Processing Technology)

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Open AccessArticle

Optimization of Residual Stress Field and Improvement of Fatigue Properties of Thin-Walled Pipes by Filling Laser Shock Peening

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Metals 2022, 12(10), 1733; https://doi.org/10.3390/met12101733 - 16 Oct 2022

Viewed by 572

Abstract

In the present work, a filling and laser shock peening (LSP) method is put forward and applied to a thin-walled pipe. Specimens were experimentally and numerically investigated to identify the residual stress field and fatigue properties of a pipe with and without LSP treatment. The numerical simulation indicated that the residual compressive stress first increased and subsequently dropped as the laser power density increased, and the extent of influence of the stretching wave, reflected from the lower surface on the unloaded area, increased with the spot diameter, causing surface tensile stress in the unloaded area. By filling the pipe with the guided-wave material, the residual stress field of the pipe that was treated with LSP was optimized, and the influence of the stress wave reflection on the residual stress field was effectively decreased. The surface residual stress of the filled guided wave material was −326 MPa, improving it by 57.6% compared with the pipe not filled with guided wave materials. The fatigue life of the pipe with the filled waveguide material that was treated by LSP was extended by 48.9%, compared with the untreated pipe. Full article

(This article belongs to the Special Issue Laser Materials Processing Technology)

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Open AccessArticle

Effect of Laser Shock Peening on High-Cycle Fatigue Performance of 1Cr18Ni9Ti/GH1140 Weld

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Metals 2022, 12(9), 1495; https://doi.org/10.3390/met12091495 - 09 Sep 2022

Viewed by 727

Abstract

The welded joints of 1Cr18Ni9Ti austenitic stainless steel and GH1140 nickel-based superalloy dissimilar materials used in certain types of aero-engine combustion liner components are prone to crack initiation during service, seriously affecting the service life of the combustion liner. In this study, laser shock peening (LSP) was applied to the dissimilar metal weld of 1Cr18Ni9Ti and GH1140, which are used in the combustion liner parts of aero engines. The effects of LSP on the residual stress, microhardness, microstructure and high-cycle fatigue performance of the weld were analyzed. The results show that the residual stress in the weld and heat-affected zones was converted from tensile residual stress to high amplitude compressive residual stress via LSP. Furthermore, the surface hardness of every region of the combustion liner weld was increased, especially in the weld zone, where an increase of 41.4% from 162 HV to 229 HV was observed. Simultaneously, with the introduction of grain refinement, gradient plastic deformation in the depth direction and the dislocation structure of the surface material, the high-cycle fatigue limit of the weld specimen was significantly increased and the fatigue limit of the 1Cr18Ni9Ti/GH1140 welded joint was improved by 65.39%, from 289 to 478 MPa. Full article

(This article belongs to the Special Issue Laser Materials Processing Technology)

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