Research Progress on High-temperature Solid-phase In-situ Laser Shock Technology in Remanufacturing

LI Zhaoxu; HU Xiaodong; DONG Shiyun

doi:10.16490/j.cnki.issn.1001-3660.2025.19.001

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Surface Technology ›› 2025, Vol. 54 ›› Issue (19) : 1-13. DOI: 10.16490/j.cnki.issn.1001-3660.2025.19.001

Research Review

Research Progress on High-temperature Solid-phase In-situ Laser Shock Technology in Remanufacturing

LI Zhaoxu^1,2, HU Xiaodong¹, DONG Shiyun^2,*

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Abstract

Laser shock peening (LSP) is widely used to adjust the microstructure and residual stress state of materials due to its high strain rate, high precision, and good controllability. In recent years, in order to improve the efficiency and effectiveness of LSP, in-situ LSP assisted additive manufacturing that synchronizes LSP and additive technology has emerged. This article introduces the technical principles and research progress of in-situ laser shock acting on high-temperature solid-phase at home and abroad, and discusses its application prospects. Taking laser shock forging (LSF) as an example, the principle of residual stress elimination by in-situ laser shock acting on high-temperature solid-phase regions is explained. The technical differences between high-temperature solid-phase in-situ laser shock and interlayer treatment are discussed. The application of high- temperature solid-phase in-situ laser shock in the fields of laser cladding and welding repair is elaborated. Finally, the research progress of high-temperature solid-phase in-situ laser shock in remanufacturing is summarized, and the development direction for the next stage is discussed. Under the theory of inherent strain, the key to reducing or eliminating the influence of residual tensile stress after additive manufacturing is to reduce or counteract the compressive plastic strain formed during the heating process. LSF introduces tensile strain at higher temperature, at which point the material is not fully yielded. Therefore, the excitation brought by the laser forces the material to yield first, and then accumulates tensile plastic strain to ambient temperature. Compared with LSP, LSF has higher operating temperature and the material is more prone to yield, resulting in a greater change in the inherent tensile strain after LSF treatment under the same impact pressure. Both 3D LSP and LSF introduce LSP into the interlayer of additive manufacturing, but the LSP in LSF is synchronized with the additive process. This allows the LSP in LSF to act at higher temperature than 3D LSP, resulting in better dynamic precipitation effects and thermal stress relaxation resistance of the microstructure. On the other hand, it also deprives LSF of the means to enhance impact strength through constraint layers. Domestic and foreign scholars' research on the application of high-temperature solid-phase in-situ laser shock mainly focuses on two aspects. One is the in-situ process that combines dual lasers with additive technology to achieve synchronous manufacturing and processing. The second is to combine arc welding with high-temperature solid-phase in-situ laser shock to complete the additive or repair process. As an emerging in-situ synchronous manufacturing process, the high efficiency and wide applicability of high-temperature solid-phase in-situ laser shock treatment make it have great potential for future applications. However, due to the wide variety of materials, complex integration of experimental equipment, and time-consuming simulation, it has high experimental costs and time costs to obtain optimal process parameters. Utilizing methods such as artificial intelligence, big data, and deep learning is a feasible approach to efficiently and effectively select machining parameters with high quality. In addition, further research is needed on the stress regulation mechanism, repair layer microstructure evolution, and performance quantification evaluation of this process.

Key words

remanufacturing / pulse laser impact / residual stress / microstructure / formation defects

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LI Zhaoxu, HU Xiaodong, DONG Shiyun. Research Progress on High-temperature Solid-phase In-situ Laser Shock Technology in Remanufacturing[J]. Surface Technology. 2025, 54(19): 1-13 https://doi.org/10.16490/j.cnki.issn.1001-3660.2025.19.001

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