Search for Articles:
Title / Keyword
Author / Affiliation / Email
Journal
Article Type
 
 
Advanced Search
 
Section
Special Issue
Volume
Issue
Number
Page
 
3.6
2.7
Journals
Crystals
Special Issues
Laser Melting of Metals and Metal Matrix Composites
share announcement

Laser Melting of Metals and Metal Matrix Composites

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Inorganic Crystalline Materials".

Deadline for manuscript submissions: closed (30 September 2023) | Viewed by 9678

Special Issue Editor

Dr. Jiandong Wang

E-Mail Website
Guest Editor
School of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
Interests: laser melting deposition; selective laser melting; composites; titanium alloy; lattice structure
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

With the rapid development of various laser-melting processing technologies, one of the primary research interests is the metallic components made of metals, alloys or metal matrix composites that have far-reaching application potential in the fields of aerospace, marine, automobile, biomedicine, etc. Laser-melting processing technologies include but are not limited to laser additive manufacturing, laser welding and laser cladding. Microstructure and mechanical properties are the key performance indicators for structural metal materials and metal matrix composites. Different laser melting processes or different metallic material compositions may lead to various performance characteristics in application. As a result, the regulation of microstructure and the improvement of mechanical properties are particularly important. For some functional metals or metal matrix composites, the optimal implementation of the desired function is the core goal. Moreover, numerical simulation methods are also welcome because they are helpful to deeply study the thermal, mechanical, flow and phase fields of laser-melting processes.

This Special Issue will bring together high-quality research and review articles on the preparation, microstructure, mechanical properties, functions, numerical simulation, and diverse applications of metallic materials and metal matrix composites manufactured by laser melting processing technologies. Potential topics include, but are not limited to:

  • New laser-melting processes or principles for metals and metal matrix composites;
  • Microstructure characterization and mechanical properties of metals or metal matrix composites manufactured by laser-melting processes;
  • New methods of regulating the microstructure and performance of metals or metal matrix composites manufactured by laser-melting processes;
  • Laser-melting processes assisted by external energy fields;
  • New concepts in functional metallic materials or components manufactured by laser-melting processes;
  • Numerical simulation of the temperature, stress, fluid or phase field of laser-melting processes.

We kindly invite you to submit a manuscript for this Special Issue. Original research articles, perspectives and reviews are all welcome.

Dr. Jiandong Wang
Guest Editor

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 submissions that pass pre-check are 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. Crystals 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 2600 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

  • laser melting
  • metals
  • metal matrix composites
  • alloys
  • microstructure characterization
  • mechanical properties
  • crystals
  • numerical simulation

Related Special Issue

Published Papers (6 papers)

Download All Papers
Order results
Result details
Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:

Research

16 pages, 34730 KiB  
Article
Comparison of the Laser-Repairing Features of TC4 Titanium Alloy with Different Repaired Layers
by Xiwang Qie, Liqun Li, Pengfei Guo, Yichen Huang and Jianxin Zhou
Crystals 2023, 13(3), 438; https://doi.org/10.3390/cryst13030438 - 03 Mar 2023
Viewed by 1147
Abstract
The laser repairing of TC4 holes was successfully performed with three and five layers under 2.5 mm and 1.0 mm diameters of laser spot, respectively. Experimental and numerical simulations were employed to clarify the influence of the repaired layers on microstructure, residual stress [...] Read more.
The laser repairing of TC4 holes was successfully performed with three and five layers under 2.5 mm and 1.0 mm diameters of laser spot, respectively. Experimental and numerical simulations were employed to clarify the influence of the repaired layers on microstructure, residual stress and strength. Optimized parameters were selected based on satisfactory formations. For the laser-repairing process with three layers, optimized parameters were selected as 1100 W laser power, 0.6 m/min scanning speed and 5 g/min powder feeding rate. For the laser-repairing process with five layers, optimized parameters were 800 W laser power, 0.9 m/min scanning speed and 3.5 g/min powder feeding rate. Numerical simulation showed that higher residual stress and larger repairing deformation would be produced when five repairing layers were adopted due to a more severe thermal accumulation effect. The microstructure from the TC4 matrix to the repaired area was orderly lamellar α phase + intercrystalline β phase-basketweave structure-martensite structure-widmannstatten structure. Tensile test results showed that higher tensile strength (910.5 MPa) would be obtained when three repaired layers were adopted. Full article
(This article belongs to the Special Issue Laser Melting of Metals and Metal Matrix Composites)
►▼ Show Figures

Figure 1

17 pages, 4203 KiB  
Article
Simulation and Experimental Analysis of Tool Wear and Surface Roughness in Laser Assisted Machining of Titanium Alloy
by Xianjun Kong, Zhanpeng Dang, Xiaole Liu, Minghai Wang and Ning Hou
Crystals 2023, 13(1), 40; https://doi.org/10.3390/cryst13010040 - 26 Dec 2022
Cited by 4 | Viewed by 1463
Abstract
A three-dimensional cutting simulation prediction model based on DEFORM-3D finite element software was developed and experimentally validated, with a maximum error of 21.1% between the experimental and simulation results. The effects of the difference in cutting mechanism between conventional machining (CM) and laser-assisted [...] Read more.
A three-dimensional cutting simulation prediction model based on DEFORM-3D finite element software was developed and experimentally validated, with a maximum error of 21.1% between the experimental and simulation results. The effects of the difference in cutting mechanism between conventional machining (CM) and laser-assisted machining (LAM) of TC6 titanium alloy on the tool wear and the surface roughness were investigated in terms of the cutting force and the cutting temperature. The depth of the laser-heated layer was mainly responsible for the difference in the cutting mechanism between the two methods. When the depth of the heating layer was smaller than the cutting depth, the tool wear of the LAM was larger than that of the CM. When the depth of the heating layer was larger than the cut depth, the surface roughness of the LAM was higher than that of the CM. Range analysis revealed that the cutting speed had the largest effect on the maximum wear depth of the rake face. Based on linear regression analysis, the cutting depth had a larger effect on the surface roughness in LAM. The average error between the linear regression prediction equation and the experimental results for surface roughness was 4.30%. Full article
(This article belongs to the Special Issue Laser Melting of Metals and Metal Matrix Composites)
►▼ Show Figures

Figure 1

15 pages, 9749 KiB  
Article
Numerical Simulation of Droplet Filling Mode on Molten Pool and Keyhole during Double-Sided Laser Beam Welding of T-Joints
by Jin Peng, Jigao Liu, Xiaohong Yang, Jianya Ge, Peng Han, Xingxing Wang, Shuai Li and Zhibin Yang
Crystals 2022, 12(9), 1268; https://doi.org/10.3390/cryst12091268 - 06 Sep 2022
Cited by 1 | Viewed by 1278
Abstract
The effects of droplets filling the molten pools during the double-sided laser beam welding (DSLBW) of T-joints was established. The dynamic behavior of the keyhole and the molten pool under different droplet filling modes were analyzed. The results indicated that compared with the [...] Read more.
The effects of droplets filling the molten pools during the double-sided laser beam welding (DSLBW) of T-joints was established. The dynamic behavior of the keyhole and the molten pool under different droplet filling modes were analyzed. The results indicated that compared with the contact transition, the stability of metal flow on the keyhole wall was reduced by free transition and slight contact transition. At the later stage of the droplet entering the molten pool via free transition, slight contact transition, and contact transition, the maximum flow velocity of the keyhole wall was 5.33 m/s, 4.57 m/s, and 2.99 m/s, respectively. When the filling mode was free transition or slight contact transition, the keyhole collapsed at the later stage of the droplet entering the molten pool. However, when the filling mode was contact transition, the middle-upper part of the interconnected keyholes became thinner at the later stage of the droplet entering the molten pool. At the later stage of the droplet entering the molten pool via free transition, the flow vortex at the bottom of the keyhole disappeared and the melt at the bottom of the keyhole flowed to the rear of the molten pool, however, the vortex remained during slight contact transition and contact transition. Full article
(This article belongs to the Special Issue Laser Melting of Metals and Metal Matrix Composites)
►▼ Show Figures

Figure 1

13 pages, 7058 KiB  
Article
Microstructure and Mechanical Properties of Laser Narrow-Gap Multi-Pass Weld 20 mm-Thick Ti-6Al-4V Alloy with Different Filling Layers
by Shenghao Meng, Liqun Li, Changjian Si, Jianfeng Gong and Wang Tao
Crystals 2022, 12(7), 977; https://doi.org/10.3390/cryst12070977 - 13 Jul 2022
Cited by 3 | Viewed by 1664
Abstract
In the narrow-gap multi-layer welding of thick Ti-6Al-4V titanium alloy sheets, reducing the number of filling layers can effectively improve the welding efficiency and reduce the possibility of interlayer defects. In order to explore the changes in the microstructure and properties of the [...] Read more.
In the narrow-gap multi-layer welding of thick Ti-6Al-4V titanium alloy sheets, reducing the number of filling layers can effectively improve the welding efficiency and reduce the possibility of interlayer defects. In order to explore the changes in the microstructure and properties of the weld after reducing the number of filling layers, Ti-6Al-4V titanium alloy sheets with a thickness of 20 mm were successfully welded using the oscillating laser beam mode by laser narrow-gap multi-pass wire filler welding in eight, six, four, and three layers, and all of the formations were good. To reduce the number of filling layers and increase the welding line energy from 0.4 kJ/mm to 1.2 kJ/mm, the melting depth and width of the single layer were changed from 4.3 mm to 10.6 mm, and 5.7 mm to 10.3 mm. The average grain size of the needle-shaped martensite increased from 1.83 μm to 2.38 μm, while the tensile strength of the filled weld area decreased from 1301.8 MPa to 1169.8 MPa, which was higher than that of the base metal of 902.1 MPa. Since there are more columnar crystals in the center of the weld at low heat input, the impact energy was 20.53 J (60.6% of the base metal) at room temperature and 15.76 J (65.9% of the base metal) at −50 ∘C. Considering the weld formation, microstructure and mechanical property, welding four layers of fillers obtained with moderate line energy (0.8 kJ/mm) was more suitable. Full article
(This article belongs to the Special Issue Laser Melting of Metals and Metal Matrix Composites)
►▼ Show Figures

Figure 1

10 pages, 3480 KiB  
Article
In Vitro and Electrochemical Characterization of Laser-Cladded Ti-Nb-Ta Alloy for Biomedical Applications
by Raj Soni, Sarang Pande, Sachin Salunkhe, Harshad Natu, Emad Abouel Nasr, Ragavanantham Shanmugam and Hussein Mohammed Abdel Moneam Hussein
Crystals 2022, 12(7), 954; https://doi.org/10.3390/cryst12070954 - 08 Jul 2022
Cited by 1 | Viewed by 1496
Abstract
Titanium (Ti) and its alloys are predominant choices for use as biomaterials in human implants. Research has shown the adverse effects of using commercial Ti alloy Ti-6Al-4V in the human body, and this presents a need for viable alternatives. In this study, Ti [...] Read more.
Titanium (Ti) and its alloys are predominant choices for use as biomaterials in human implants. Research has shown the adverse effects of using commercial Ti alloy Ti-6Al-4V in the human body, and this presents a need for viable alternatives. In this study, Ti alloy Ti-17Nb-6Ta was manufactured by laser cladding—a prominent additive manufacturing (AM) technology. Laser cladded specimens were evaluated for their in vitro and electrochemical behavior. A human osteosarcoma cell line (MG-63 cells) was used for in vitro investigations. Cell proliferation was good in the physiological medium, and cells were alive when in contact with the laser cladded alloy, even after two to three weeks, indicating good cell viability and compatibility with this alloy. Electrochemical characterization was carried out in Ringer’s solution, and noticeably lower corrosion current density and corrosion rate values were observed. The lower amounts of these parameters indicated the passivation behavior due to multi-layer Ti, Nb, and Ta alloy oxide films. These oxide films also enhanced osseointegration. Thus, the Ti-17Nb-6Ta alloy can be an ideal biocompatible alternative to Ti-6Al-4V. Full article
(This article belongs to the Special Issue Laser Melting of Metals and Metal Matrix Composites)
►▼ Show Figures

Figure 1

18 pages, 10956 KiB  
Article
Numerical Simulation of Molten Pool Dynamics in Laser Deep Penetration Welding of Aluminum Alloys
by Jin Peng, Hongqiao Xu, Xiaohong Yang, Xingxing Wang, Shuai Li, Weimin Long and Jian Zhang
Crystals 2022, 12(6), 873; https://doi.org/10.3390/cryst12060873 - 20 Jun 2022
Cited by 2 | Viewed by 1850
Abstract
In this paper, the numerical simulation of molten pool dynamics in laser deep penetration welding of aluminum alloys was established based on the FLUENT 19.0 software. The three-dimensional transient behavior of the keyhole and the flow field of molten pool at different welding [...] Read more.
In this paper, the numerical simulation of molten pool dynamics in laser deep penetration welding of aluminum alloys was established based on the FLUENT 19.0 software. The three-dimensional transient behavior of the keyhole and the flow field of molten pool at different welding speeds were analyzed, and the influence of the welding speed on the molten pool of aluminum alloys in laser welding was obtained. The results indicated that the generation of welding spatters was directly related to the fluctuation of the diameter size in the middle of the keyhole. When the diameter in the middle of the keyhole increased by a certain extent, welding spatters occurred. When welding spatters occurred, the diameter in the middle of the keyhole became smaller. In addition, the size of the spatters at the welding speed of 9 m/min was larger than that of the spatters at the welding speeds of 3 m/min and 6 m/min. The welding spatter formed in laser deep penetration welding included: spatter created by an inclined liquid column behind the keyhole; splash created by a vertical liquid column behind the keyhole; small particles splashed in front of the keyhole. With the increase of the welding speed, the tendency of the welding spatter to form in front of the keyhole and to form a vertical liquid column behind the keyhole became weaker. When the welding speed was 9 min, only an obliquely upward liquid column appeared on the molten pool surface behind the keyhole. Compared with the welding speeds of 6 m/min and 9 m/min, the maximum flow velocity fluctuation of the molten pool at the welding speed of 3 m/min was obviously higher. Full article
(This article belongs to the Special Issue Laser Melting of Metals and Metal Matrix Composites)
►▼ Show Figures

Figure 1

Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:
 
Displaying articles 1-6
Back to TopTop