Microscopic substructures of stainless steel 304 undergoing a uniaxial ratcheting deformation

Dong, Yun; Zhang, Zhiyong; He, Xu

doi:10.1007/s00707-020-02804-6

Cited by 4 publications

(1 citation statement)

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“…Cheng et al [28] observed the microstructure evolution of 304 stainless steel during uniaxial ratcheting deformation and found that when the ratcheting strain reached a certain value, the strain-induced Martensite transformation occurred during the ratcheting process, and the amount of induced Martensite gradually increased with the number of cycles. In order to reveal the microscopic mechanism of ratcheting deformation, Dong et al [29][30][31] and Kang et al [32,33] recently observed the dislocation structures and their evolution law of metals with different crystal structures during uniaxial ratcheting and multiaxial ratcheting through transmission electron microscopy (TEM). It was found that during the ratcheting deformation process, the dislocation configuration gradually evolves from low-density dislocation configurations such as dislocation lines and dislocation pileups to high-density dislocation configurations such as dislocation veins, dislocation walls, and dislocation cells as the number of cycles increases.…”

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confidence: 99%

Study on the Microscopic Mechanism of Axle Steel EA4T during Uniaxial Cyclic Deformation Process

Ren

Yang

Zhao

et al. 2023

Metals

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In order to reveal the dislocation evolution law of body-centered cubic axle steel EA4T during cyclic deformation and provide an experimental basis for the subsequent construction of cyclic constitutive models based on microscopic physical mechanisms, macroscopic deformation experiments were first conducted on axle steel EA4T, including monotonic tensile experiments under different deformation amounts, symmetric strain cycling experiments under a different number of cycles, and ratcheting deformation experiments under a different number of cycles. Then, systematic observations of different samples at different deformation stages were conducted using a Transmission Electron Microscope (TEM) to investigate the dislocation configuration and evolution during strain cycling and ratcheting deformation. The observed results show that the dislocation evolution law of axle steel EA4T during the uniaxial tensile experiment, symmetrical strain cycling, and ratcheting deformation is basically the same, and the dislocation density increases with the increase in plastic deformation and number of cycles. The dislocation configuration gradually develops from low-density dislocation configurations such as dislocation lines and dislocation pileups to high-density dislocation configurations such as severe dislocation tangles and dislocation walls. The microscopic mechanism of the uniaxial ratcheting evolution of axle steel EA4T can be qualitatively explained by the dislocation configuration and evolution.

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