Abstract

This study emphasizes the effect of ultrasonic surface rolling (USR) on the surface roughness, hardness, and tribological properties of ductile iron under different normal loads. Results revealed that surface roughness was reduced by 96% and surface hardness increased by 37.8% after USR treatment. By increasing normal load, the average friction coefficient of the USR-treated specimens decreased, but the wear rate of both USR-treated and untreated specimens increased, mainly because the dominant wear mechanism changed. The average friction coefficient of the untreated specimen (~ 0.32) was much higher than the USR-treated specimen (~ 0.24) when the normal load was 30 N. However, the wear rate of the USR-treated specimen was larger than that of the untreated specimen when the normal load was greater than 20 N because the higher hardness abrasive particles on the worn surface of the USR-treated specimen not only accelerated abrasive particle wear, but also caused more severe adhesive wear.

Graphic Abstract

中文翻译：

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超声表面轧制对不同法向载荷下球墨铸铁干滑动摩擦学行为的影响

摘要

这项研究强调了超声表面轧制（USR）在不同法向载荷下对球墨铸铁表面粗糙度，硬度和摩擦学性能的影响。结果表明，经USR处理后，表面粗糙度降低了96％，表面硬度提高了37.8％。通过增加正常载荷，经USR处理的试样的平均摩擦系数降低，但经USR处理的试样和未经处理的试样的磨损率均增加，这主要是因为主要的磨损机理发生了变化。当正常载荷为30 N时，未经处理的试样的平均摩擦系数（〜0.32）远高于经USR处理的试样（〜0.24）。但是，

图形摘要