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<p>This study systematically investigates the thermal characteristics and microstructural evolution of the Ti-6Al-4&#xa0;V alloy during abrasive waterjet machining (AWJM) using advanced six-colour pyrometry and comprehensive material characterization. The results reveal that AWJM involves repeated thermomechanical coupling effects, with transient temperatures reaching 3602.08&#xa0;K at a jet pressure of 240&#xa0;MPa. A 33% pressure reduction decreases the peak temperature by 35%. Rapid cooling from the β-phase region induces martensitic transformation and grain refinement, increasing the geometrically necessary dislocation (GND) density by 17% at higher pressures. Microhardness improves by 11.12% due to dislocation strengthening, whereas lower pressures (180&#xa0;MPa) enhance corrosion resistance, exhibiting the highest charge transfer resistance (99.22 × 10⁴ Ω·cm²) and the lowest corrosion rate (0.22 × 10⁻³ mm/year). The results underscore the critical role of jet pressure in controlling the thermomechanical coupling, enabling tailored surface properties for specific application requirements.</p>

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Pressure-dependent thermal characteristics and microstructural evolution in abrasive waterjet-induced surface strengthening of Ti-6Al-4 V alloy

  • 期刊论文

  • 发表日期：

    2026年1月8日

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  • Shuaikang Chang,
  • Wenchuan Liu,
  • Jiren Tang,
  • Zhandong Tian

摘要

This study systematically investigates the thermal characteristics and microstructural evolution of the Ti-6Al-4 V alloy during abrasive waterjet machining (AWJM) using advanced six-colour pyrometry and comprehensive material characterization. The results reveal that AWJM involves repeated thermomechanical coupling effects, with transient temperatures reaching 3602.08 K at a jet pressure of 240 MPa. A 33% pressure reduction decreases the peak temperature by 35%. Rapid cooling from the β-phase region induces martensitic transformation and grain refinement, increasing the geometrically necessary dislocation (GND) density by 17% at higher pressures. Microhardness improves by 11.12% due to dislocation strengthening, whereas lower pressures (180 MPa) enhance corrosion resistance, exhibiting the highest charge transfer resistance (99.22 × 10⁴ Ω·cm²) and the lowest corrosion rate (0.22 × 10⁻³ mm/year). The results underscore the critical role of jet pressure in controlling the thermomechanical coupling, enabling tailored surface properties for specific application requirements.