Determination of Dynamic Constitutive Parameters for 18CrNiMo7-6 Alloy Steel

doi:10.3901/JME.2025.06.184

Abstract

Abstract: Based on the concept of layer-by-layer inversion, a method for determining the quasi-static constitutive parameters of the surface-modified layer of 18CrNiMo7-6 alloy steel after carburising heat treatment is presented. After carburizing, the surface microstructure of the matrix specimen changes and forms a surface-modified layer. The carburised specimen is subjected to chemical corrosion stripping to obtain a round rod specimen with different thicknesses of the surface-modified layer. The stress-strain relationships of matrix and surface-modified layer specimens with different thicknesses were obtained through a servo fatigue testing machine at 25 ℃ and a strain rate of 0.000 5 s^-1. The Johnson-Cook (J-C) constitutive model was applied to describe the quasi-static mechanical properties of 18CrNiMo7-6 alloy steel while at the same time ignoring the influence of strain rate and temperature. The J-C model parameters of the surface-modified layer are determined based on the test data and genetic optimisation algorithm. Results show that after carburizing, the elastic modulus of the specimen does not show any evident difference, but there is a significant increase in the yield strength and tensile strength of the specimen. The surface-modified layer was characterized. The microstructure information of the surface-modified layer was elicited, which showed the physical nature that led to the evident differences in the mechanical properties of the surface-modified layer specimens with different thicknesses. The LS-DYNA finite element software was used to simulate the quasi-static tensile test process of the specimen. The reliability of the obtained parameters was verified. All these results provide an essential reference for numerical simulations in practical engineering applications.

Key words: 18CrNiMo7-6 alloy steel, surface-modified layer, Johnson-Cook constitutive model, tensile test, finite element simulation

CLC Number:

TG142

XU Guangtao, LI Can, LU Liucheng, ZHANG Yue, WANG Gang, LI Lingxiao. Determination of Dynamic Constitutive Parameters for 18CrNiMo7-6 Alloy Steel[J]. Journal of Mechanical Engineering, 2025, 61(6): 184-193.

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