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Layered inversion method for dynamic constitutive model of the 18CrNiMo7-6 alloy steel surface-modified layer
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Guangtao XU1, 2, 3, Gong LI1, 2, 3, Xiao’an CHANG1, 2, 3, Guangzhao HAN1, 2, 3, Minghao ZHAO1, 2, 3
Journal of Mechanical Strength | 2025, 47(9) : 54 - 61
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Journal of Mechanical Strength | 2025, 47(9): 54-61
Layered inversion method for dynamic constitutive model of the 18CrNiMo7-6 alloy steel surface-modified layer
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Guangtao XU1, 2, 3, Gong LI1, 2, 3, Xiao’an CHANG1, 2, 3, Guangzhao HAN1, 2, 3, Minghao ZHAO1, 2, 3
Affiliations
  • 1.School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou 450001, China
  • 2.Industrial Science & Technology Institute for Anti-fatigue Manufacturing, Zhengzhou 450016, China
  • 3.Henan Province Engineering Research Center of Anti-fatigue Manufacturing Technology, Zhengzhou 450001, China
Published: 2025-09-15 doi: 10.16579/j.issn.1001.9669.2025.09.004
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To address the issue of characterizing static and dynamic mechanical behaviors of the surface-modified layer (SML) in 18CrNiMo7-6 alloy steel, a layered inversion method for the Johnson-Cook (J-C) constitutive model of SML was proposed. The SML was subjected to layered processing, and dynamic compression tests were conducted on cylindrical specimens with different SML thicknesses. Through progressive parameter inversion, the strain rate sensitivity coefficient C at each depth of the SML was determined. Combined with quasi-static thin plate tensile tests at different temperatures for each depth of the SML, the corresponding yield strength A, strain hardening coefficient B, strain hardening index n, and thermal softening exponent m were determined. Test results show that the SML of 18CrNiMo7-6 alloy steel exhibits significant strain hardening, strain rate strengthening, and temperature softening effects. Additionally, a correlation model between J-C constitutive parameters and dimensionless depth h/hb (distance to SML surface/SML effective depth) was established,providing support for subsequent composite strengthening simulations.

Surface-modified layer  /  Johnson-Cook constitutive model  /  Carburization  /  18CrNiMo7-6 alloy steel
Guangtao XU, Gong LI, Xiao’an CHANG, Guangzhao HAN, Minghao ZHAO. Layered inversion method for dynamic constitutive model of the 18CrNiMo7-6 alloy steel surface-modified layer[J]. Journal of Mechanical Strength, 2025 , 47 (9) : 54 -61 . DOI: 10.16579/j.issn.1001.9669.2025.09.004
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  • Key Program of National Natural Science Foundation of China(12432004)
Appendix
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Year 2025 volume 47 Issue 9
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Article Info
doi: 10.16579/j.issn.1001.9669.2025.09.004
  • Receive Date：2025-04-27
  • Online Date：2026-03-20
  • Published：2025-09-15
Article Data
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History
  • Received：2025-04-27
Funding
Key Program of National Natural Science Foundation of China(12432004)
Affiliations
    1.School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou 450001, China
    2.Industrial Science & Technology Institute for Anti-fatigue Manufacturing, Zhengzhou 450016, China
    3.Henan Province Engineering Research Center of Anti-fatigue Manufacturing Technology, Zhengzhou 450001, China

Corresponding:

ZHAO Minghao, E-mail：
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表12种不同金属材料的力学参数
科
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Number of
genus		 种数
Number of
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Percentage of
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Genus		 种数
Number of
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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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