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<p>An ultrasonic micro-forging strengthening method is applied to address the high residual stress and coarse internal structure in laser additive cladding Ti2AlNb metal powder on Ti6Al4V substrate. The influence of ultrasonic micro-forging processing parameters on the micro-structure and surface mechanical properties of the Ti2AlNb additive cladding layer is investigated. By testing and analyzing the micro-structure, micro-hardness, and residual stress on the surface of the cladding layer, the role of ultrasonic micro-forging parameters on the performance of the cladding layer is revealed. The results show that after ultrasonic micro-forging treatment, the micro-structure of the cladding layer is composed of a dendritic and needle α<sub>2</sub> phase transformation into a large number of equiaxed α<sub>2</sub> phase, and clear grain boundaries appear, with smaller grain sizes closer to the top. The micro-hardness of the cladding layer increases along with the ultrasonic amplitude. When the amplitude is 7&#xa0;<i>μ</i>m, the micro-hardness of each region reaches its maximum, with the surface hardness reaching 596.2&#xa0;HV the middle hardness at the depth of 1200&#xa0;<i>μ</i>m reaching 515.6&#xa0;HV, and the bottom hardness at the depth of 2000&#xa0;<i>μ</i>m reaching 478.9&#xa0;HV. The residual stress on the surface of the cladding layer gradually converts from the initial residual tensile stress to the residual compressive stress with the increase of ultrasonic amplitude and forging force. Experimental results have shown that ultrasonic micro-forging refines grain size, effectively improves the internal structure of the cladding layer; and appropriate processing parameters can enhance the micro-hardness and surface mechanical properties.</p>

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Study on the Surface Properties of Ti2AlNb Laser Additive Cladding Layer Under Ultrasonic Micro-forging

  • 期刊论文

  • 发表日期：

    2025年3月25日

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  • Guofu Gao,
  • Guangmiao Wang,
  • Xianrong Pan,
  • Chenyang Wei,
  • Yunfei Xiang,
  • Daohui Xiang

摘要

An ultrasonic micro-forging strengthening method is applied to address the high residual stress and coarse internal structure in laser additive cladding Ti2AlNb metal powder on Ti6Al4V substrate. The influence of ultrasonic micro-forging processing parameters on the micro-structure and surface mechanical properties of the Ti2AlNb additive cladding layer is investigated. By testing and analyzing the micro-structure, micro-hardness, and residual stress on the surface of the cladding layer, the role of ultrasonic micro-forging parameters on the performance of the cladding layer is revealed. The results show that after ultrasonic micro-forging treatment, the micro-structure of the cladding layer is composed of a dendritic and needle α2 phase transformation into a large number of equiaxed α2 phase, and clear grain boundaries appear, with smaller grain sizes closer to the top. The micro-hardness of the cladding layer increases along with the ultrasonic amplitude. When the amplitude is 7 μm, the micro-hardness of each region reaches its maximum, with the surface hardness reaching 596.2 HV the middle hardness at the depth of 1200 μm reaching 515.6 HV, and the bottom hardness at the depth of 2000 μm reaching 478.9 HV. The residual stress on the surface of the cladding layer gradually converts from the initial residual tensile stress to the residual compressive stress with the increase of ultrasonic amplitude and forging force. Experimental results have shown that ultrasonic micro-forging refines grain size, effectively improves the internal structure of the cladding layer; and appropriate processing parameters can enhance the micro-hardness and surface mechanical properties.