E-Mail Alert

Add your e-mail address to receive forthcoming issues of this journal:

Journal Browser

Journal Browser

Special Issue "Laser Materials Processing"

A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: 31 March 2018

Special Issue Editors

Guest Editor
Prof. Dr. Frank A. Müller

Friedrich Schiller University Jena, Otto Schott Institute of Materials Research (OSIM), Colloids, Surfaces, and Interfaces (CSI), Löbdergraben 32, 07743 Jena, Germany
Website | E-Mail
Interests: bio-inspired materials; biomaterials; biomineralization; laser materials processing; additive manufacturing; surface modification; nanoparticles
Guest Editor
Dr. Stephan Gräf

Friedrich Schiller University Jena, Otto Schott Institute of Materials Research (OSIM), Colloids, Surfaces, and Interfaces (CSI), Löbdergraben 32, 07743 Jena, Germany
Website | E-Mail
Interests: bio-inspired materials; laser materials processing; functional surfaces; surface structuring; laser-induced periodic surface structures (LIPSS)

Special Issue Information

Dear Colleagues,

Nowadays, industrial production processes are inconceivable without lasers. Lasers have been established in numerous areas of materials processing, like cutting, drilling and welding. A broad variety of available laser systems with different wavelengths, pulse durations, and intensities facilitate the processing of almost all types of materials, including metals, ceramics, semiconductors, polymers, and composites. The main advantages of laser-based technologies include their high flexibility and efficiency, the reproducible adjustability of processing parameters, and the excellent quality of processed products. The required amount of energy can be provided in a well-defined, locally limited volume with negligible heat transfer to surrounding components. These unique properties are continuously stimulating new applications of lasers as a tool in materials processing. Consequently, novel processing routes in surface engineering (micro- and nanostructuring; laser induced periodic surface structures), additive manufacturing (stereolithography; selective laser sintering), coating techniques (pulsed laser deposition; matrix assisted pulsed laser evaporation), and nanoparticle synthesis (laser ablation; laser vaporisation) are on their way from research to industrial application.

This Special Issue covers the whole spectrum of laser materials processing, ranging from novel trends in well-established industrial processing techniques like cutting and drilling, via the synthesis of functional nanoparticles and coatings, the fabrication of sub-wavelength surface structures up to additive manufacturing techniques for the preparation of 3D scaffolds. The performance and application of laser-processed materials in the fields of biomaterials, optics, energy and environmental technologies will be discussed. In addition, fundamental research concerning the interaction between laser radiation and matter, as well as simulations and modeling of formation processes and structure-property relations will be topics of specific interest.

It is our pleasure to invite you to submit a manuscript for this Special Issue. Full papers, short communications, as well as reviews, would be greatly appreciated.

Prof. Dr. Frank A. Müller
Dr. Stephan Gräf
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • interaction between laser radiation and matter
  • novel trends in laser materials processing
  • micro- and nanoscale structures
  • laser induced periodic surface structures
  • selective laser sintering stereolithography
  • pulsed laser deposition
  • laser-based nanoparticle synthesis
  • strategies for the fabrication of bio-inspired materials
  • application of laser processed materials
  • simulation and modeling

Published Papers (5 papers)

View options order results:
result details:
Displaying articles 1-5
Export citation of selected articles as:

Research

Open AccessArticle Microstructures and Properties of Laser Cladding Al-TiC-CeO2 Composite Coatings
Materials 2018, 11(2), 198; doi:10.3390/ma11020198
Received: 31 December 2017 / Revised: 19 January 2018 / Accepted: 22 January 2018 / Published: 26 January 2018
Cited by 1 | PDF Full-text (90590 KB) | HTML Full-text | XML Full-text
Abstract
Al-TiC-CeO2 composite coatings have been prepared by using a laser cladding technique, and the microstructure and properties of the resulting composite coatings have been investigated using scanning electron microscopy (SEM), a 3D microscope system, X-ray diffraction (XRD), micro-hardness testing, X-ray stress measurements,
[...] Read more.
Al-TiC-CeO2 composite coatings have been prepared by using a laser cladding technique, and the microstructure and properties of the resulting composite coatings have been investigated using scanning electron microscopy (SEM), a 3D microscope system, X-ray diffraction (XRD), micro-hardness testing, X-ray stress measurements, friction and wear testing, and an electrochemical workstation. The results showed that an Al-Fe phase appears in the coatings under different applied laser powers and shows good metallurgical bonding with the matrix. The dilution rate of the coating first decreases and then increases with increasing laser power. The coating was transformed from massive and short rod-like structures into a fine granular structure, and the effect of fine grain strengthening is significant. The microhardness of the coatings first decreases and then increases with increasing laser power, and the maximum microhardness can reach 964.3 HV0.2. In addition, the residual stress of the coating surface was tensile stress, and crack size increases with increasing stress. When the laser power was 1.6 kW, the coating showed high corrosion resistance. Full article
(This article belongs to the Special Issue Laser Materials Processing)
Figures

Figure 1

Open AccessArticle Study of the Microstructure and Cracking Mechanisms of Hastelloy X Produced by Laser Powder Bed Fusion
Materials 2018, 11(1), 106; doi:10.3390/ma11010106
Received: 23 December 2017 / Revised: 9 January 2018 / Accepted: 9 January 2018 / Published: 11 January 2018
PDF Full-text (8075 KB) | HTML Full-text | XML Full-text
Abstract
Hastelloy X (HX) is a Ni-based superalloy which suffers from high crack susceptibility during the laser powder bed fusion (LPBF) process. In this work, the microstructure of as-built HX samples was rigorously investigated to understand the main mechanisms leading to crack formation. The
[...] Read more.
Hastelloy X (HX) is a Ni-based superalloy which suffers from high crack susceptibility during the laser powder bed fusion (LPBF) process. In this work, the microstructure of as-built HX samples was rigorously investigated to understand the main mechanisms leading to crack formation. The microstructural features of as-built HX samples consisted of very fine dendrite architectures with dimensions typically less than 1 µm, coupled with the formation of sub-micrometric carbides, the largest ones were mainly distributed along the interdendritic regions and grain boundaries. From the microstructural analyses, it appeared that the formation of intergranular carbides provided weaker zones, which combined with high thermal residual stresses resulted in hot cracks formation along the grain boundaries. The carbides were extracted from the austenitic matrix and characterized by combining different techniques, showing the formation of various types of Mo-rich carbides, classified as M6C, M12C and MnCm type. The first two types of carbides are typically found in HX alloy, whereas the last one is a metastable carbide probably generated by the very high cooling rates of the process. Full article
(This article belongs to the Special Issue Laser Materials Processing)
Figures

Figure 1

Open AccessArticle Reactive Fabrication and Effect of NbC on Microstructure and Tribological Properties of CrS Co-Based Self-Lubricating Coatings by Laser Cladding
Materials 2018, 11(1), 44; doi:10.3390/ma11010044
Received: 6 December 2017 / Revised: 24 December 2017 / Accepted: 26 December 2017 / Published: 28 December 2017
PDF Full-text (13210 KB) | HTML Full-text | XML Full-text
Abstract
The CrS/NbC Co-based self-lubricating composite coatings were successfully fabricated on Cr12MoV steel surface by laser clad Stellite 6, WS2, and NbC mixed powders. The phase composition, microstructure, and tribological properties of the coatings ware investigated by means of X-ray diffraction (XRD),
[...] Read more.
The CrS/NbC Co-based self-lubricating composite coatings were successfully fabricated on Cr12MoV steel surface by laser clad Stellite 6, WS2, and NbC mixed powders. The phase composition, microstructure, and tribological properties of the coatings ware investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectrometer (EDS), as well as dry sliding wear testing. Based on the experimental results, it was found reactions between WS2 and Co-based alloy powder had occurred, which generated solid-lubricant phase CrS, and NbC play a key role in improving CrS nuclear and refining microstructure of Co-based composite coating during laser cladding processing. The coatings were mainly composed of γ-Co, CrS, NbC, Cr23C6, and CoCx. Due to the distribution of the relatively hard phase of NbC and the solid lubricating phase CrS, the coatings had better wear resistance. Moreover, the suitable balance of CrS and NbC was favorable for further decreasing the friction and improving the stability of the contact surfaces between the WC ball and the coatings. The microhardness, friction coefficient, and wear rate of the coating 4 (Clad powders composed of 60 wt % Stellite 6, 30 wt % NbC and 10 wt % WS2) were 587.3 HV0.5, 0.426, and 5.61 × 10−5 mm3/N·m, respectively. Full article
(This article belongs to the Special Issue Laser Materials Processing)
Figures

Figure 1

Open AccessArticle Thermal, Spectral and Laser Properties of Er3+:Yb3+:GdMgB5O10: A New Crystal for 1.5 μm Lasers
Materials 2018, 11(1), 25; doi:10.3390/ma11010025
Received: 28 November 2017 / Revised: 20 December 2017 / Accepted: 21 December 2017 / Published: 25 December 2017
PDF Full-text (10188 KB) | HTML Full-text | XML Full-text
Abstract
A novel laser crystal of Er3+:Yb3+:GdMgB5O10 with dimension of 26 × 16 × 12 mm3 was grown successfully from K2Mo3O10 flux by the top seeded solution growth method. The thermal
[...] Read more.
A novel laser crystal of Er3+:Yb3+:GdMgB5O10 with dimension of 26 × 16 × 12 mm3 was grown successfully from K2Mo3O10 flux by the top seeded solution growth method. The thermal diffusivity and specific heat capacity were measured to calculate the thermal conductivity of the crystal. The absorption and fluorescence properties of the crystal at room temperature were investigated in detail. The Judd-Ofelt method was used to analyze the polarized absorption spectra. The emission cross-section of the 4I13/24I15/2 transition was calculated by the Füchtbauer-Ladenburg formula and the relevant gain cross-sections were estimated. Continuous-wave laser output of 140 mW at 1569 nm with the slope efficiency of 17.8% was demonstrated in a plano-concave resonator. The results reveal that Er3+:Yb3+:GdMgB5O10 crystal is a promising material for 1.5 μm lasers. Full article
(This article belongs to the Special Issue Laser Materials Processing)
Figures

Open AccessArticle Effects of Pulse Parameters on Weld Microstructure and Mechanical Properties of Extra Pulse Current Aided Laser Welded 2219 Aluminum Alloy Joints
Materials 2017, 10(9), 1091; doi:10.3390/ma10091091
Received: 18 August 2017 / Revised: 9 September 2017 / Accepted: 11 September 2017 / Published: 15 September 2017
PDF Full-text (32700 KB) | HTML Full-text | XML Full-text
Abstract
In order to expand the application range of laser welding and improve weld quality, an extra pulse current was used to aid laser-welded 2219 aluminum alloy, and the effects of pulse current parameters on the weld microstructure and mechanical properties were investigated. The
[...] Read more.
In order to expand the application range of laser welding and improve weld quality, an extra pulse current was used to aid laser-welded 2219 aluminum alloy, and the effects of pulse current parameters on the weld microstructure and mechanical properties were investigated. The effect mechanisms of the pulse current interactions with the weld pool were evaluated. The results indicated that the coarse dendritic structure in the weld zone changed to a fine equiaxed structure using an extra pulse current, and the pulse parameters, including medium peak current, relatively high pulse frequency, and low pulse duty ratio benefited to improving the weld structure. The effect mechanisms of the pulse current were mainly ascribed to the magnetic pinch effect, thermal effect, and electromigration effect caused by the pulse current. The effect of the pulse parameters on the mechanical properties of welded joints were consistent with that of the weld microstructure. The tensile strength and elongation of the optimal pulse current-aided laser-welded joint increased by 16.4% and 105%, respectively, compared with autogenous laser welding. Full article
(This article belongs to the Special Issue Laser Materials Processing)
Figures

Figure 1

Back to Top