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<p>Surface finishing/strengthening of thin-walled components can effectively enhance their fracture performance under detonation impact. This paper adopts an orthogonal experimental design to study the influence of micro-forging process parameters on the depth of the plastic deformation layer on the surface of 304 stainless steel. Based on the obtained high-frequency micro-forging process parameters for a specified plastic deformation layer depth, the outer surface of thin-walled cylindrical shell components was treated with micro-forging finishing/strengthening. The results show that the material performance was improved through the synergistic effects of dislocation slip, overlapping, intersecting twin generation, and α’-martensite phase transformation induced by hammering. The surface roughness was reduced to Ra 0.22&#xa0;μm, the surface hardness increased by 22%-32%, the residual stress curve was highly consistent with the distribution of the plastic deformation layer, and the changes in cylindricity and concentricity of the samples were less than 15%, with roundness changes less than 25%. This study provides theoretical support for the surface strengthening of high-performance thin-walled components and offers a new optimization strategy for precision machining in high-end manufacturing fields.</p>

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Micro-forging on 304 stainless steel thin-walled components material strengthening mechanism and surface accuracy of the impact of research

  • 期刊论文

  • 发表日期：

    2025年12月5日

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  • Haotian Sun,
  • Bin Shen,
  • Jinxing Kong

摘要

Surface finishing/strengthening of thin-walled components can effectively enhance their fracture performance under detonation impact. This paper adopts an orthogonal experimental design to study the influence of micro-forging process parameters on the depth of the plastic deformation layer on the surface of 304 stainless steel. Based on the obtained high-frequency micro-forging process parameters for a specified plastic deformation layer depth, the outer surface of thin-walled cylindrical shell components was treated with micro-forging finishing/strengthening. The results show that the material performance was improved through the synergistic effects of dislocation slip, overlapping, intersecting twin generation, and α’-martensite phase transformation induced by hammering. The surface roughness was reduced to Ra 0.22 μm, the surface hardness increased by 22%-32%, the residual stress curve was highly consistent with the distribution of the plastic deformation layer, and the changes in cylindricity and concentricity of the samples were less than 15%, with roundness changes less than 25%. This study provides theoretical support for the surface strengthening of high-performance thin-walled components and offers a new optimization strategy for precision machining in high-end manufacturing fields.