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Abstract <p>Nano-surface modification and the introduction of residual compressive stress can enhance the service performance of materials. This study investigates the surface integrity of steel Q345R used for pressure vessels after ultrasonic peening, elucidating the evolution of the surface microstructure and its impact on mechanical properties. The experimental results indicate that as the peening time increases, the surface roughness first increases and then decreases, while the surface hardness increases, with a maximum increase of approximately 21.1% compared to the unpeened specimens. As the shot diameter increases, the surface roughness decreases, and the surface hardness decreases, with a minimum increase of about 5.7% compared to the unpeened specimens. As the peening height increases, the surface roughness decreases, and the surface hardness continues to decrease, with a minimum increase of about 11.6% compared to the unpeened specimens. EBSD characterization revealed that peening induced significant plastic deformation on the specimen surface, with a noticeable refinement of grains, reducing in size by about 83.8%, and a significant increase in dislocation density compared to the unpeened areas. Through tensile testing and data analysis, the peening process parameters were optimized. Under the conditions of 8 min of peening time, a shot diameter of 5&#xa0;mm, and a peening height of 10 cm, the tensile strength and yield strength of Q345R increased by 3.8 and 10.4%, respectively, resulting in the best comprehensive tensile performance.</p>

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Surface Tissue Evolution and Effect on Tensile Properties of Q345R Steel under Ultrasonic Shot Peening

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • Li Kun,
  • Chen Xiang

摘要

Abstract

Nano-surface modification and the introduction of residual compressive stress can enhance the service performance of materials. This study investigates the surface integrity of steel Q345R used for pressure vessels after ultrasonic peening, elucidating the evolution of the surface microstructure and its impact on mechanical properties. The experimental results indicate that as the peening time increases, the surface roughness first increases and then decreases, while the surface hardness increases, with a maximum increase of approximately 21.1% compared to the unpeened specimens. As the shot diameter increases, the surface roughness decreases, and the surface hardness decreases, with a minimum increase of about 5.7% compared to the unpeened specimens. As the peening height increases, the surface roughness decreases, and the surface hardness continues to decrease, with a minimum increase of about 11.6% compared to the unpeened specimens. EBSD characterization revealed that peening induced significant plastic deformation on the specimen surface, with a noticeable refinement of grains, reducing in size by about 83.8%, and a significant increase in dislocation density compared to the unpeened areas. Through tensile testing and data analysis, the peening process parameters were optimized. Under the conditions of 8 min of peening time, a shot diameter of 5 mm, and a peening height of 10 cm, the tensile strength and yield strength of Q345R increased by 3.8 and 10.4%, respectively, resulting in the best comprehensive tensile performance.