Jiansheng Liu, Kunlun Ni, Feifei Zhang, Kai He, Hui Xu
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引用次数: 0
Abstract
This study utilized novel tungsten alloy micro-particles fabricated via the cost-effective Blasting Erosion Arc Machining (BEAM) technology to perform micro-shot peening on flexspline steel specimens. A systematic comparison was conducted with traditional atomized cast steel and ceramic micro-particles, evaluating key performance indicators such as surface topography, roughness, micro-hardness distribution, residual stress fields, X-ray diffraction phase analysis, electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM) micro-structural characterization. The influence of peening intensity on surface strengthening was also investigated. The results indicate that tungsten alloy micro-shot peening achieves a surface roughness of Ra 1.216 μm, a maximum residual compressive stress of −733 MPa and a compressive stress depth of 110 μm. It also yields a superior surface hardness of 471.2 HV and a hardened layer depth of 135 μm, while maintaining excellent surface integrity. Microstructural analysis reveals refined subsurface grains with an average size of 0.4 μm, a high dislocation density of 3.756×1015 m−2, and a kernel average misorientation (KAM) of 0.73°, significantly exceeding the results obtained with both comparative media. TEM observations further confirm the formation of nanograins in the top surface layer. Gradient experiments on peening intensity demonstrate a systematic enhanement in strengthening effects across both mechanical properties and micro-structural characteristics with increasing intensity, offering practical insights for optimizing process parameters. These findings collectively underscore the superiority of tungsten alloy micro-particles over cast steel and ceramic micro-particles in enhancing surface mechanical properties and micro-structural refinement. Consequently, BEAM-fabricated tungsten-alloy micro-particles combine economical production with high performance, demonstrating significant promise for industrial surface enhancement applications.
期刊介绍：
Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.
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