Laser Additive Manufacturing of Steels and Alloys

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Additive Manufacturing".

Deadline for manuscript submissions: closed (31 May 2021) | Viewed by 4448

Special Issue Editor


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Guest Editor
Dublin City University Adv Proc Technol Res Ctr, Adv Mfg Res Ctr Dublin, Ireland
Interests: additive manufacturing; metallurgy; advanced metals and alloys

Special Issue Information

Dear Colleagues,

It is my pleasure to invite you to submit a manuscript (full paper, communication, or review paper) to the present Special Issue of Metals. Additive manufacturing (AM), also known as 3D printing, is an emerging net-shape manufacturing technology that can produce complex 3D solid and which has recently gained attention as a potential replacement for traditional manufacturing techniques. The ability of AM processes such as laser powder bed fusion (L-PBF) to create complex geometries has caused rapid growth in several industries. Energy savings, less material waste, faster design-to-build time, design optimization, reduction in manufacturing steps, and product customization are the most important advantages of AM. The steel industry needs new materials to meet its customers’ increasingly complex demands for products they can use, for instance, to manufacture lightweight and crash-resistant components for the automotive sector. This is where laser AM techniques such as L-PBF come into play, thanks to their ability to exploit digital data to improve component functionality. Adopting metallic 3D printing based on L-PBF technology also gives users the opportunity to sustainably optimize the steel industry’s value chain.

The main aim of this Special Issue is to collect various recent developments in cutting-edge research for enabling laser AM processes for manufacturing of advanced steels and alloys, focusing on microstructure and mechanical property improvement. Papers presenting investigations of novel steel chemical compositions and laser AM techniques for high energy absorbent steels are welcome. In addition, studies that focus on corrosion resistance and hydrogen-induced cracking of 3D-printed steels are welcome. Researchers who are working on computational materials engineering for multiscale modeling of laser AM processes are also encouraged to submit papers. Authors are also encouraged to present new measurement and monitoring techniques of laser AM of steels and alloys.

Dr. Reza Taherzadeh Mousavian
Guest Editor

Manuscript Submission Information

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Keywords

  • Laser Additive Manufacturing
  • Steels and Alloys
  • Microstructure
  • Mechanical Properties
  • Computational Materials Engineering
  • Corrosion Resistance
  • Hydrogen-induced Cracking
  • Monitoring Techniques

Published Papers (1 paper)

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Research

12 pages, 5867 KiB  
Article
Effect of Hydrogen on the Tensile Behavior of Austenitic Stainless Steels 316L Produced by Laser-Powder Bed Fusion
by Farzaneh Khaleghifar, Khashayar Razeghi, Akbar Heidarzadeh and Reza Taherzadeh Mousavian
Metals 2021, 11(4), 586; https://doi.org/10.3390/met11040586 - 3 Apr 2021
Cited by 9 | Viewed by 3790
Abstract
Hydrogen was doped in austenitic stainless steel (ASS) 316L tensile samples produced by the laser-powder bed fusion (L-PBF) technique. For this aim, an electrochemical method was conducted under a high current density of 100 mA/cm2 for three days to examine its sustainability [...] Read more.
Hydrogen was doped in austenitic stainless steel (ASS) 316L tensile samples produced by the laser-powder bed fusion (L-PBF) technique. For this aim, an electrochemical method was conducted under a high current density of 100 mA/cm2 for three days to examine its sustainability under extreme hydrogen environments at ambient temperatures. The chemical composition of the starting powders contained a high amount of Ni, approximately 12.9 wt.%, as a strong austenite stabilizer. The tensile tests disclosed that hydrogen charging caused a minor reduction in the elongation to failure (approximately 3.5% on average) and ultimate tensile strength (UTS; approximately 2.1% on average) of the samples, using a low strain rate of 1.2 × 10−4 s−1. It was also found that an increase in the strain rate from 1.2 × 10−4 s−1 to 4.8 × 10−4 s−1 led to a reduction of approximately 3.6% on average for the elongation to failure and 1.7% on average for UTS in the pre-charged samples. No trace of martensite was detected in the X-ray diffraction (XRD) analysis of the fractured samples thanks to the high Ni content, which caused a minor reduction in UTS × uniform elongation (UE) (GPa%) after the H charging. Considerable surface tearing was observed for the pre-charged sample after the tensile deformation. Additionally, some cracks were observed to be independent of the melt pool boundaries, indicating that such boundaries cannot necessarily act as a suitable area for the crack propagation. Full article
(This article belongs to the Special Issue Laser Additive Manufacturing of Steels and Alloys)
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