Nanoindentation Experiment and Finite Element Characterization of the Cyclic Deformation Behavior of Duplex Stainless Steel

doi:10.3901/JME.2020.22.090

Abstract

Abstract: The basic mechanical properties and the cyclic indentation deformation behavior of the austenitic and ferrite phases of duplex stainless steel are discussed and compared through the monotonic and cyclic nanoindentation experiments with different loading modes (indentation load and displacement controlled) and different loading waveforms. Based on the indentation experiment results and the elastoplastic constitutive model combined with modified ABDEL-KARIM-OHNO nonlinear dynamic hardening rule, a constitutive model parameter characterization method for the plastic and cyclic plastic behavior of austenite and ferrite phases in duplex stainless steel is developed. The rationality of the parameter characterization method is verified by simulating the overall tensile and cyclic deformation behavior of the representative volume unit of duplex stainless steel, and comparing with the macroscopic experimental results. It is shown that the strength and hardness of the ferrite phase are higher than those of the austenite phase, and the two phases have a certain interaction through the grain boundary. Both the austenite phase and the ferrite phase exhibit obvious indentation ratcheting phenomenon under cyclic indentation loadings, while the ratcheting deformation increases with loading levels. The developed constitutive model parameter characterization method can provide reference for studying the cyclic deformation behavior of each phase of multiphase materials and small-volume materials.

Key words: duplex stainless steel, nano-indentation, plasticity, cyclic plasticity, parameters of cyclic constitutive model

CLC Number:

TB331

GUO Sujuan, SHI Yanru, JIA Yunfei, ZHAO Jian. Nanoindentation Experiment and Finite Element Characterization of the Cyclic Deformation Behavior of Duplex Stainless Steel[J]. Journal of Mechanical Engineering, 2020, 56(22): 90-100.

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