On-line evaluation and monitoring technology for material surface integrity in laser shock peening – A review

Qin, Rui; Zhang, Zhifen; Hu, Zhiyao; Du, Zhengyao; Xiang, Xianwen; Wen, Guangrui; He, Weifeng

doi:10.1016/j.jmatprotec.2022.117851

Cited by 26 publications

(8 citation statements)

References 112 publications

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“…Several contemporary methods are used to modify critical areas of the axle, e.g., hardening, laser shock peening, rolling, shot peening, etc. [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Residual Stresses and the Microstructure of Modeled Laser-Hardened Railway Axle Seats under Fatigue

Čapek,

Trojan,

Kec

et al. 2024

Metals

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Railway wheels are usually attached to axles by press-fitting; therefore, the mechanical processes taking place during operation can result in failure, with fatal consequences for the axle seats. This manuscript describes the effect of laser hardening on the residual stress state, microstructural parameters (lattice defects—dislocations, crystallites, microstrains, etc.), and mechanical properties of laser-hardened EA1N steel railway axles under fatigue life conditions. Differences were found between ground, single-track, and multi-track hardened surfaces. Tensile residual stresses, low dislocation densities and hardnesses, and different microstructures (tempered cubic martensite) were found at the overlapped tracks and at the boundary of the heat-affected zone and bulk surface compared with the hardened zone. As a result, the surface treatment of axle seats by laser hardening improved the fatigue failure resistance compared with untreated seats. Optimal properties of the integrity of the axle seat surface were achieved, including fatigue resistance, which seems to be positively influenced mainly by sufficient hardness and the appropriate microstructure. The influence of the other investigated parameters was not evident, and was reduced by the presence of fretting corrosion and press-fitting.

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“…Several contemporary methods are used to modify critical areas of the axle, e.g., hardening, laser shock peening, rolling, shot peening, etc. [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Residual Stresses and the Microstructure of Modeled Laser-Hardened Railway Axle Seats under Fatigue

Čapek,

Trojan,

Kec

et al. 2024

Metals

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“…These characteristics meet the diverse needs of applications ranging from everyday electronic products to industrial, agricultural production, and military communications [4,5] . With the advent of hypersonic missiles and reentry vehicles, the development of new electromagnetic wave transmitting materials tailored to meet stringent aerodynamic thermal requirements and withstand complex service environments has become a critical task for researchers in this field [6,7] . However, ceramic bulk materials often exhibit several limitations, such as high brittleness, difficulties in forming large components, and poor thermal shock resistance, which have become bottlenecks in the development of high-temperature electromagnetic wave transmitting materials based on ceramics [8][9][10] .…”

Section: Introductionmentioning

confidence: 99%

Micro-crystalline Evolution and Enhanced Mechanical Properties of Continuous BN Fibers

Qi,

Ding,

et al. 2024

Preprint

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With their unique combination of low density, high thermal conductivity, high thermal stability, excellent chemical inertness, and good dielectric properties, boron nitride (BN) fibers are promising for advanced material applications, particularly in the field of electromagnetic wave transmission. The fabrication of high-quality, continuous BN fibers via inorganic methods still faces unresolved challenges. In this study, continuous boron oxide (B2O3) precursor fibers were initially produced using a melt spinning process with boric acid as the raw material. Subsequently, primary BN fiber products containing residual B2O3 (referred to as BNO) and final BN fibers were successively prepared through a two-step nitridation process. The effects of the drawing process and the initial nitridation temperature on the composition and phase constitution of B2O3 were extensively investigated. Additionally, it explored the processes of crystallization and orientation evolution in continuous BN fibers, thereby elucidating the impact of micro-structure on the mechanical properties of both BNO and BN fibers. It is noteworthy that the continuous BN fibers, subjected to a secondary nitridation process at 1850°C, exhibited exceptional mechanical properties, with a tensile strength of 890.9 MPa and an elastic modulus of 40.8 GPa. This study not only produce continuous BN fibers with exceptional mechanical properties but also provide a detailed description of their synthesis process and structural evolution, offering valuable insights for enhancing the mechanical performance of continuous fibrous materials with two-dimensional structure.

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“…Acoustic emission (AE) is a vibration phenomenon in a matrix material when phase transition or material removal happens under stress [ 11 ]. AE technique is a suitable and efficient method for monitoring the machining process, since it is a non-destructive testing method, and AE signals generated during the machining process include essential information about the machined materials [ 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Revealing the interaction mechanism of pulsed laser processing with the application of acoustic emission

Liu

Rong

Yang

et al. 2023

Front. Optoelectron.

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The mechanisms of interaction between pulsed laser and materials are complex and indistinct, severely influencing the stability and quality of laser processing. This paper proposes an intelligent method based on the acoustic emission (AE) technique to monitor laser processing and explore the interaction mechanisms. The validation experiment is designed to perform nanosecond laser dotting on float glass. Processing parameters are set differently to generate various outcomes: ablated pits and irregular-shaped cracks. In the signal processing stage, we divide the AE signals into two bands, main and tail bands, according to the laser processing duration, to study the laser ablation and crack behavior, respectively. Characteristic parameters extracted by a method that combines framework and frame energy calculation of AE signals can effectively reveal the mechanisms of pulsed laser processing. The main band features evaluate the degree of laser ablation from the time and intensity scales, and the tail band characteristics demonstrate that the cracks occur after laser dotting. In addition, from the analysis of the parameters of the tail band very large cracks can be efficiently distinguished. The intelligent AE monitoring method was successfully applied in exploring the interaction mechanism of nanosecond laser dotting float glass and can be used in other pulsed laser processing fields. Graphical Abstract

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On-line evaluation and monitoring technology for material surface integrity in laser shock peening – A review

Cited by 26 publications

References 112 publications

Residual Stresses and the Microstructure of Modeled Laser-Hardened Railway Axle Seats under Fatigue

Residual Stresses and the Microstructure of Modeled Laser-Hardened Railway Axle Seats under Fatigue

Micro-crystalline Evolution and Enhanced Mechanical Properties of Continuous BN Fibers

Revealing the interaction mechanism of pulsed laser processing with the application of acoustic emission

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