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Study on the effect of nitrogen ion implantation process on the bending fatigue strength of carburized and quenched gear
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Wei ZHANG1, Huapo JIA1, Rongxin GUAN2, Xiaopeng WANG2, 3, Chengtian MA2, Yaowei XU1
Journal of Mechanical Strength | 2025, 47(8) : 91 - 100
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Journal of Mechanical Strength | 2025, 47(8): 91-100
• Experimental Research·Testing Technology •
Study on the effect of nitrogen ion implantation process on the bending fatigue strength of carburized and quenched gear
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Wei ZHANG1, Huapo JIA1, Rongxin GUAN2, Xiaopeng WANG2, 3, Chengtian MA2, Yaowei XU1
Affiliations
  • 1.School of Mechanical Engineering, Zhengzhou University of Science and Technology, Zhengzhou 450064, China
  • 2.National Gear Product Quality Inspection and Testing Center, China Academy of Machinery Zhengzhou Research Institute of Mechanical Engineering Co., Ltd., Zhengzhou 450001, China
  • 3.School of Mechanical Engineering, Zhengzhou University of Aeronautics, Zhengzhou 450015, China
Published: 2025-08-15 doi: 10.16579/j.issn.1001.9669.2025.08.011
Outline
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Aiming at optimizing the gear surface modification process, the influence of ion nitrogen implantation on the bending fatigue strength of carburized and quenched gears was studied.Using low-carbon alloy steel 18CrNiMo7-6 carburized and quenched gears as the matrix, nitrogen ion implantation treatment was carried out through a radio-frequency plasma-assisted ion implantation system. The root metallography, hardness gradient, residual stress distribution, and bending fatigue properties of ion-implanted gears and unimplanted gears were systematically compared. The results show that the ion nitrogen implantation process increases the root hardness from 695 HV0.1 to 780 HV0.1, an increase of 12.2%; the hardened layer depth decreases from 1.50 mm to 1.41 mm, a reduction of 6.0%; and the surface residual stress decreases from -400 MPa to -286 MPa, a reduction of 28.5%. Based on the R-S-N equation fitted by bending fatigue tests, under 99% reliability, the fatigue life of ion-implanted gears is only 12.3%-19.3% of that of the control gears, with the failure mode dominated by brittle fracture and accelerated crack propagation rate. The study indicates that although ion nitrogen implantation can delay crack initiation through surface strengthening, the excessively shallow hardened layer and reduced residual stress lead to insufficient crack propagation resistance, ultimately weakening the bending fatigue life of gears.

Nitrogen ion implantation  /  Gear bending fatigue  /  Fatigue life  /  Residual stress
Wei ZHANG, Huapo JIA, Rongxin GUAN, Xiaopeng WANG, Chengtian MA, Yaowei XU. Study on the effect of nitrogen ion implantation process on the bending fatigue strength of carburized and quenched gear[J]. Journal of Mechanical Strength, 2025 , 47 (8) : 91 -100 . DOI: 10.16579/j.issn.1001.9669.2025.08.011
Funding
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  • Key R&D and Promotion Projects of Henan Province(252102220076)
  • Key Research Projects of Henan Higher Education Institutions(23A460024; 23A460004)
Appendix
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Year 2025 volume 47 Issue 8
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Article Info
doi: 10.16579/j.issn.1001.9669.2025.08.011
  • Receive Date：2025-05-09
  • Online Date：2026-03-19
  • Published：2025-08-15
Article Data
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History
  • Received：2025-05-09
Funding
Key R&D and Promotion Projects of Henan Province(252102220076)
Key Research Projects of Henan Higher Education Institutions(23A460024; 23A460004)
Affiliations
    1.School of Mechanical Engineering, Zhengzhou University of Science and Technology, Zhengzhou 450064, China
    2.National Gear Product Quality Inspection and Testing Center, China Academy of Machinery Zhengzhou Research Institute of Mechanical Engineering Co., Ltd., Zhengzhou 450001, China
    3.School of Mechanical Engineering, Zhengzhou University of Aeronautics, Zhengzhou 450015, China

Corresponding:

GUAN Rongxin, E-mail：
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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