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Metals
Special Issues
Laser Shock Peening: From Fundamentals to Applications
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Laser Shock Peening: From Fundamentals to Applications

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

Deadline for manuscript submissions: 30 September 2025 | Viewed by 277

Special Issue Editors

Prof. Dr. Hongyu Zheng

E-Mail Website
Guest Editor
Centre for Advanced Laser Manufacturing (CALM), School of Mechanical Engineering, Shandong University of Technology, Zibo 255000, China
Interests: ultra-fast laser-matter interactions; laser micro-/nano-processing; hybrid manufacturing processes and in-process monitoring
Special Issues, Collections and Topics in MDPI journals
Dr. Zongshen Wang

E-Mail Website
Guest Editor
Centre for Advanced Laser Manufacturing (CALM), School of Mechanical Engineering, Shandong University of Technology, Zibo 255000, China
Interests: laser materials processing and surface engineering; severe plastic deformation techniques and mechanism of metals; microstructure and property modulation of lightweight alloys

Special Issue Information

Dear Colleagues,

Laser shock peening (LSP) has emerged as a promising laser-based surface treatment technology featuring high pressure (1 GPa-1 TPa), high energy (more than 1 GW), ultra-fast (no more than nanosecond scale), and ultra-high strain rate (more than 106 s-1). LSP’s unique surface severe plastic deformation process has been shown to enhance the wear, corrosion, and fatigue performance of metallic materials and alloys by introducing gradient microstructure, work hardening, and beneficial compressive residual stress. In recent decades, LSP has seen rapid development and wide-scale  implementation in various industrial fields, including aerospace, nuclear, and biomedical applications. Extensive research has been conducted to reveal the relationship among surface integrity, microstructure, property/performance, and the LSP process. The demand for LSP technology in laser processing is steadily increasing.

The current Special Issue focuses on fundamental mechanisms, innovative developments, and novel applications of LSP. In essence, it covers surface integrity, microstructure, and properties of target materials; simulation; quality monitoring; and processing windows of LSP. It also covers innovative developments such as ultra-short-pulse, micro-scale, and multi-energy-field assisted LSP, and application of LSP in additive manufacturing. Reviews on mechanisms, laser systems, microstructural evolution, engineering performance, challenges and future trends in LSP of metallic materials and alloys are also welcomed.

Prof. Dr. Hongyu Zheng
Dr. Zongshen Wang
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 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. Metals 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

  • surface integrity
  • compressive residual stress
  • microstructure
  • properties and performance
  • energy-field-assisted LSP
  • ultra-short-pulse and micro-scale LSP
  • LSP without coating
  • LSP in additive manufacturing
  • real-time monitoring and quality prediction of LSP
  • process simulation and optimization of LSP

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Published Papers (1 paper)

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Research

14 pages, 5068 KiB  
Article
Fatigue Threshold and Microstructure Characteristic of TC4 Titanium Alloy Processed by Laser Shock
by Sixin Zha, Heng Zhang, Jiong Yang, Zhen Zhang, Xinxin Qi and Qun Zu
Metals 2025, 15(4), 453; https://doi.org/10.3390/met15040453 - 17 Apr 2025
Viewed by 175
Abstract
Laser shock peening (LSP) is an effective method to improve the fatigue property of metallic materials, and a thorough understanding of its strengthening mechanism is crucial for technology application. In this study, the LSP and fatigue tests of TC4 titanium alloy have been [...] Read more.
Laser shock peening (LSP) is an effective method to improve the fatigue property of metallic materials, and a thorough understanding of its strengthening mechanism is crucial for technology application. In this study, the LSP and fatigue tests of TC4 titanium alloy have been carried out. Combined with the structural characterization and the crystal plasticity finite element (CPFE) simulation, the relationship of stress distribution, microstructure evolution and fatigue performance caused by LSP is revealed. The results indicate that the material’s fatigue life initially increases and subsequently declines with the rising pulse energy. At the optimal pulse energy condition, the laser-shocked specimen demonstrates a 126% increase in fatigue life relative to the untreated specimen, which is accompanied by the higher residual compressive stress along the depth. Meanwhile, the grains become more refined with a uniform size change gradient, and the β phase content drops from 4.1% to 2.2%. Notably, regions with <1-21-0> crystal orientation can be selectively achieved. With the favorable <1-21-0> slip direction orthogonal to the applied fatigue loading axis, the generation and propagation of dislocations are effectively constrained, thereby significantly enhancing the material’s fatigue performance. The stress distribution and fatigue life in models with different grain sizes and phase contents are further analyzed by the CPFE method, showing good consistency with the experimental results. Theoretically, the excessively high pulse energy causes the transient temperature (1769 °C) to surpass the melting point (1660 °C), which can affect the recrystallization structure and stress distribution. Full article
(This article belongs to the Special Issue Laser Shock Peening: From Fundamentals to Applications)
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