研究目的
To investigate the effects of laser shock peening (LSP) on the microstructure and fatigue behavior of Ti–6Al–4V alloy fabricated via electron beam melting (EBM).
研究成果
LSP significantly improved the fatigue strength and microhardness of EBM Ti–6Al–4V alloy by refining the grain structure and introducing residual compressive stresses. The study provides insights into the microstructural evolution and the mechanism of fatigue strength enhancement by LSP.
研究不足
The study focuses on the effects of LSP on Ti–6Al–4V alloy fabricated via EBM, and the findings may not be directly applicable to other materials or manufacturing methods. The depth of the hardened layer and the extent of grain refinement are specific to the LSP parameters used.
1：Experimental Design and Method Selection:
The study involved the use of LSP as a post-treatment process on Ti–6Al–4V alloy samples fabricated via EBM. The microstructure and mechanical properties before and after LSP were compared.
2：Sample Selection and Data Sources:
Ti–6Al–4V alloy samples were prepared using EBM. The composition of the alloy powder and the EBM processing parameters were detailed.
3：List of Experimental Equipment and Materials:
An Arcam A2X system was used for EBM processing, and a Nd:YAG laser was used for LSP. The samples were characterized using optical microscopy (OM), X-ray diffraction (XRD), and transmission electron microscopy (TEM).
4：Experimental Procedures and Operational Workflow:
The EBM samples were divided into two groups for microstructural and mechanical property characterization before and after LSP. LSP was performed with specific parameters, and the samples were tested for fatigue performance.
5：Data Analysis Methods:
The microhardness and fatigue strength were measured and compared. The fracture morphologies were examined using scanning electron microscopy (SEM) to analyze the fatigue failure stages.
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