Mechanical properties and strengthening mechanisms of Ti-6Al-4V treated by electro-pulsing assisted laser shock peening
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY(2024)
摘要
Laser shock peening (LSP) is an efficient surface treatment method used to improve the mechanical properties of materials. With the growing demand for high-performance components under extreme conditions, there is a need for further improvement in the effects of LSP. Recently, electro-pulsing assisted laser shock peening (EP-LSP) has emerged as a promising technique to enhance the effects of single -mechanical -field LSP. However, there has been limited systematic research on the effects of mechanical properties and strengthening mechanisms of material treating by EP-LSP. Herein, Ti-6Al-4V samples were subjected to synchronous treatment with electro-pulsing and LSP. The effects of EP-LSP on surface and subsurface characteristics, including surface morphology, hardness, residual stress and microstructure, were investigated and compared with both as -received and LSP-treated samples. Furthermore, the strength and ductility properties were carefully analyzed, and the strengthening mechanism was elucidated. It was observed that EP-LSP produced greater plastic deformation, inducing higher surface hardness and compressive residual stress. Tensile tests demonstrated that the EP-LSP-treated samples exhibited an increase of 7.5% in yield strength, 8.4% in ultimate tensile strength, and 19.7% in elongation compared to LSP-treated samples. Further analysis of the microstructure revealed significant phase transformation and recrystallization in the EP-LSP-treated sample. The increasing dislocation density, nano -twins and grain refinement had contributions to the strength, with nano -twins having the most significant contribution.
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关键词
Electro-pulsing assistance,Laser shock peening,Mechanical properties,Microstructure characteristics,Strengthening mechanisms
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