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Influence of initial microstructure on surface integrity of ultrasonic impacting strengthened 34CrNi3MoA steel crankshaft

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Abstract

The ultrasonic impacting process was carried out on the fillet of 34CrNi3MoA steel crankshaft treated by quenching and tempering, medium frequency quenching and gas nitriding respectively, and the variations of surface integrity of crankshaft were analyzed. The results show that the Ra of fillet can be decreased to below 0.2 µm after the ultrasonic impacting. The ultrasonic impacted crankshaft with initial process of gas nitriding has the highest hardness but the lowest hardness increase rate due to its high deformation resistance of nitriding layer. The ultrasonic impacting can transfer the tensile residual stress to the compressive residual stress on the fillet, the specimens with initial process of gas nitriding exhibit the highest compressive residual stress of −412.17 MPa. The fatigue performance model of the crankshaft was established based on Basquin and Goodman equations, the crankshaft treated by gas nitriding and ultrasonic impacting is supposed to have the highest fatigue limit.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 51605207) and the Starting Research Fund from the Jiangsu University of Science and Technology (No. 1022932102).

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Authors and Affiliations

  1. School of Mechanical Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, China

    Jianzhi Chen, Yunhai Zhuge, Xuwen Jing, Yan Wang & Guochao Li

  2. Henan Diesel Engine Heavy Industry Co., Ltd., Luoyang, 471039, China

    Hailiang Ren

Authors
  1. Jianzhi Chen
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  2. Yunhai Zhuge
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  3. Hailiang Ren
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  4. Xuwen Jing
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  5. Yan Wang
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  6. Guochao Li
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Corresponding author

Correspondence to Jianzhi Chen.

Additional information

Chen Jianzhi received his Ph.D. from the Northeastern University, Shenyang, China, in 2021. Since January 2021, he has been a Teacher in the School of Mechanical Engineering, Jiangsu University of Science and Technology, Zhenjiang, China. His research interests include surface strengthening process, fatigue fracture behaviors of materials and fatigue life prediction.

Zhu Ge Yunhai is a graduate student at the School of Mechanical Engineering, Jiangsu University of Science and Technology, Jiangsu Province, China. His research interests include surface strengthening techniques, residual stress evolution and its evolution mechanism on fatigue failure.

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Chen, J., Zhuge, Y., Ren, H. et al. Influence of initial microstructure on surface integrity of ultrasonic impacting strengthened 34CrNi3MoA steel crankshaft. J Mech Sci Technol 38, 683–689 (2024). https://doi.org/10.1007/s12206-024-0117-x

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  • DOI: https://doi.org/10.1007/s12206-024-0117-x

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