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<p>In this study, ultrasonic surface rolling (USR) was introduced to reduce the coefficient of friction (COF) and wear volume of 17Cr2Ni2MoVNb carburized gear steel. Residual stress distribution, microstructure, microhardness, and fretting wear behaviors with different USR rolling loads (600 N, 800 N 1000 N, and 1200 N) based on the gas carburizing treatment were examined. Results showed that dislocation and grain refinement were formed after USR treatment, and the residual compressive stresses (−527&#xa0;MPa) and microhardness (908 HV<sub>0.2</sub>) at the top surface were increased by 57.78 % and 14.21 % of the samples treated with 1200 N. In addition, fretting wear behavior tests verified that the reduced COF and wear volume were due to the formation of a compressive stress field and gradient ultrafine grain. Moreover, carburized samples exhibited adhesion and three-body abrasion wear mechanisms, and the USR-treated samples showed oxidative wear and lamination.</p>

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Surface Integrity and Fretting Wear Behavior of Modified 17Cr2Ni2MoVNb Steel by Gas Carburizing Combined with Ultrasonic Surface Rolling

  • 期刊论文

  • 发表日期：

    2025年9月4日

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  • Yalong Zhang,
  • Chenjia Jiao,
  • Yuhan Hu,
  • Dapeng Shi,
  • Luji Wu,
  • Le Liu,
  • Vincent Ji,
  • Yanfei Xia

摘要

In this study, ultrasonic surface rolling (USR) was introduced to reduce the coefficient of friction (COF) and wear volume of 17Cr2Ni2MoVNb carburized gear steel. Residual stress distribution, microstructure, microhardness, and fretting wear behaviors with different USR rolling loads (600 N, 800 N 1000 N, and 1200 N) based on the gas carburizing treatment were examined. Results showed that dislocation and grain refinement were formed after USR treatment, and the residual compressive stresses (−527 MPa) and microhardness (908 HV0.2) at the top surface were increased by 57.78 % and 14.21 % of the samples treated with 1200 N. In addition, fretting wear behavior tests verified that the reduced COF and wear volume were due to the formation of a compressive stress field and gradient ultrafine grain. Moreover, carburized samples exhibited adhesion and three-body abrasion wear mechanisms, and the USR-treated samples showed oxidative wear and lamination.