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<p>This study focuses on optimizing water jet peening parameters for the Ti6Al4V alloy to enhance its hardness, surface roughness, and overall performance. Ti6Al4V, recognized for its high strength and corrosion resistance, can benefit from water jet peening to improve fatigue resistance. Key parameters examined include nozzle angle (30°, 90°), jet pressure (100, 150, 200&#xa0;MPa), standoff distance (2, 3, 4&#xa0;mm), and peening duration (1, 2, 3&#xa0;s). An L18 orthogonal array was employed to structure the experimental design. Results indicate that high jet pressures promote plastic deformation, leading to increased surface hardening, while the standoff distance displays a non-linear relationship with hardness, indicating an optimal range for effective energy transfer. Extended peening durations correlate with enhanced hardness, although excessive jet pressures may result in material removal. The nozzle angle significantly influences surface roughness. The grey relational grade (GRG) analysis identifies the combination of nozzle angle, jet pressure, and standoff distance as critical factors, with Experiment Set 4 achieving the highest GRG value of 0.67399. ANOVA results demonstrate that the interactions among nozzle angle, jet pressure, and standoff distance have the most substantial impact of 42% on overall performance, with nozzle angle contributing 63.63% to surface roughness. These findings highlight the potential of water jet peening as an effective surface treatment technique for improving the longevity and performance of Ti6Al4V alloy components.</p> Graphical abstract <p></p>

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Optimizing water jet peening parameters for enhanced hardness and surface integrity of Ti6Al4V alloy: a multi-objective approach using Taguchi grey relational analysis

  • 期刊论文

  • 发表日期：

    2025年12月19日

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  • K. Divyatheja,
  • G. Rajyalakshmi

摘要

This study focuses on optimizing water jet peening parameters for the Ti6Al4V alloy to enhance its hardness, surface roughness, and overall performance. Ti6Al4V, recognized for its high strength and corrosion resistance, can benefit from water jet peening to improve fatigue resistance. Key parameters examined include nozzle angle (30°, 90°), jet pressure (100, 150, 200 MPa), standoff distance (2, 3, 4 mm), and peening duration (1, 2, 3 s). An L18 orthogonal array was employed to structure the experimental design. Results indicate that high jet pressures promote plastic deformation, leading to increased surface hardening, while the standoff distance displays a non-linear relationship with hardness, indicating an optimal range for effective energy transfer. Extended peening durations correlate with enhanced hardness, although excessive jet pressures may result in material removal. The nozzle angle significantly influences surface roughness. The grey relational grade (GRG) analysis identifies the combination of nozzle angle, jet pressure, and standoff distance as critical factors, with Experiment Set 4 achieving the highest GRG value of 0.67399. ANOVA results demonstrate that the interactions among nozzle angle, jet pressure, and standoff distance have the most substantial impact of 42% on overall performance, with nozzle angle contributing 63.63% to surface roughness. These findings highlight the potential of water jet peening as an effective surface treatment technique for improving the longevity and performance of Ti6Al4V alloy components.

Graphical abstract