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<p>This study investigates the application of water immersion ultrasonic testing to evaluate microstructural homogeneity and mechanical property uniformity in 718 mold steel, a material extensively utilized in large-scale precision and die-casting molds. Ultrasonic signals were acquired from samples subjected to distinct heat treatment protocols (air cooling and water quenching). Critical ultrasonic parameters, such as time-domain attenuation coefficients and longitudinal wave velocities, were derived through signal processing techniques. These parameters were rigorously correlated with microstructural features (characterized via scanning electron microscopy, SEM) and mechanical performance metrics, including Vickers hardness and Charpy impact toughness. A systematic analysis of microstructural heterogeneity across thickness-directional layers revealed significant correlations between ultrasonic signatures and phase distribution (e.g., martensite, bainite, and retained austenite). The results conclusively demonstrate that water immersion ultrasonic characterization provides a robust nondestructive framework for quantifying spatial uniformity in both microstructural organization and mechanical behavior of 718 mold steel.</p>

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Evaluation of Microstructural Homogeneity and Mechanical Property Uniformity in 718 Mold Steel via Water Immersion Ultrasonic Characterization

  • 期刊论文

  • 发表日期：

    2025年10月25日

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  • Jiazheng Jiang,
  • Anmin Yin,
  • Zhi Xu,
  • Wenchao Liao

摘要

This study investigates the application of water immersion ultrasonic testing to evaluate microstructural homogeneity and mechanical property uniformity in 718 mold steel, a material extensively utilized in large-scale precision and die-casting molds. Ultrasonic signals were acquired from samples subjected to distinct heat treatment protocols (air cooling and water quenching). Critical ultrasonic parameters, such as time-domain attenuation coefficients and longitudinal wave velocities, were derived through signal processing techniques. These parameters were rigorously correlated with microstructural features (characterized via scanning electron microscopy, SEM) and mechanical performance metrics, including Vickers hardness and Charpy impact toughness. A systematic analysis of microstructural heterogeneity across thickness-directional layers revealed significant correlations between ultrasonic signatures and phase distribution (e.g., martensite, bainite, and retained austenite). The results conclusively demonstrate that water immersion ultrasonic characterization provides a robust nondestructive framework for quantifying spatial uniformity in both microstructural organization and mechanical behavior of 718 mold steel.