Recovery of tensile properties of twinning-induced plasticity steel via electropulsing induced void healing

Yang, Chen; Yang, H.J.; Zhang, Z.J.; Zhang, Z.F.

doi:10.1016/j.scriptamat.2018.01.008

Cited by 61 publications

(11 citation statements)

References 25 publications

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“…If TWIP steels are subjected to plastic deformation, the initiation of micro-voids could undermine the strain-hardening capability and result in premature failure. Improving the mechanical properties is expected by eliminating the micro voids using electropulsing treatment (EPT) [ 120 ]. Figure 6 a–c shows an interesting phenomenon where EPT could recover the strength and plasticity, but annealing treatment had no such ability.…”

Section: Lb-xrt Examplesmentioning

confidence: 99%

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Correlation of Materials Property and Performance with Internal Structures Evolvement Revealed by Laboratory X-ray Tomography

Zhang

Wang

2018

Materials

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Although X-rays generated from a laboratory-based tube cannot be compared with synchrotron radiation in brilliance and monochromaticity, they are still viable and accessible in-house for ex situ or interrupted in situ X-ray tomography. This review mainly demonstrates recent works using laboratory X-ray tomography coupled with the measurements of properties or performance testing under various conditions, such as thermal, stress, or electric fields. Evolvements of correlated internal structures for some typical materials were uncovered. The damage features in a graded metallic 3D mesh and a metallic glass under mechanical loading were revealed and investigated. Micro-voids with thermal treatment and void healing phenomenon with electropulsing were clearly demonstrated and quantitatively analyzed. The substance transfer around an electrode of a Li-S battery and the protective performance of a Fe-based metallic glass coating on stainless steel were monitored through electrochemical processes. It was shown that in situ studies of the laboratory X-ray tomography were suitable for the investigation of structure change under controlled conditions and environments. An extension of the research for in situ laboratory X-ray tomography can be expected with supplementary novel techniques for internal strain, global 3D grain orientation, and a fast tomography strategy.

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Section: Lb-xrt Examplesmentioning

confidence: 99%

“… ( a – c ) tensile results, ( d – g ) SEM images, and ( h – i ) XRT volume renderings of a crack for Fe–22Mn–0.9C TWIP steel specimens. These results show the healing effect with EPT, which is superior to the annealing technique [ 120 ]. …”

Section: Figurementioning

confidence: 99%

Correlation of Materials Property and Performance with Internal Structures Evolvement Revealed by Laboratory X-ray Tomography

Zhang

Wang

2018

Materials

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“…In general, the void healing effect induced by EPT can be explained by the inhomogeneous temperature rise caused by the difference of electric resistance between voids and matrix. This inhomogeneous temperature rise can lead to inhomogeneous thermal expansion, so that the voids will be subjected to a strong thermal compressive stress and then consequently healed 19 . In this work, for the tip region of deformed carbide, the temperature rise around the carbide will be higher because of the detour effect of EPT.…”

Section: Discussionmentioning

confidence: 99%

Voids healing and carbide refinement of cold rolled M50 bearing steel by electropulsing treatment

Wang

Qian

Hua

et al. 2019

Sci Rep

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The voids caused by the cold rolling (CR) quite deteriorates the final performance of M50 bearing steel. In this work, the effect of electropulsing treatment (EPT) on the voids has been investigated, finding that the nano-size voids around carbides have been extensively healed. Moreover, it is interesting to find that the Cr-rich carbides are partially dissolved and consequently refined by EPT, which could be attributed to the decreased thermodynamic dissolution barriers and accelerated kinetic diffusion of carbon atoms towards dislocation. These results inspire people to develop a novel strategy (CR + EPT) to fully take advantage of CR and tailor the carbides size in bearing steels.

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“…At present, the physical simulation and numerical simulation were mainly used in the research of internal crack healing [5,6]. Scholars have studied the evolution process of internal cracks from the perspectives of healing mechanism [7], healing methods [8], healing influencing factors [9], and establishment of determination methods [10]. Chen et al [11,12] studied void defects' evolution inside large forgings based on the numerical simulation and experimental verification.…”

Section: Introductionmentioning

confidence: 99%

Effect of Deformation Parameters on Microstructure and Mechanical Properties of Internal Crack Healing in As‐Cast 30Cr2Ni4MoV Steel

Jiao

Zhou

Liu

et al. 2021

Advances in Materials Science and Engineering

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Crack defects seriously affected the quality of heavy forgings, which needed to be eliminated by forging process. In this study, the healing process of internal crack defects was studied under different deformation parameters. The internal crack was produced by drilling the sample of 30Cr2Ni4MoV steel and then compressing the sample with different deformation. The microstructure of the crack healing zone was observed using an optical microscope. Meanwhile, the static and dynamic mechanical properties of the crack healing zone were tested by room-temperature tensile tests and impact tests, respectively. The results showed that dynamic recrystallization (DRX) and grain growth were the main factors for internal crack healing. When the forging ratio (FR) was 1.5, the cracks at the corner of the void began to heal, which was caused by DRX. At FR 2.0, the DRX was completed and the center crack was completely healed. The tensile properties of crack healing zones were restored to more than 95% of the base material. As the FR increased to 2.2, the elongation increased slightly and the yield strength decreased slightly, which indicated that the grain growth played an important role in the plastic recovery and DRX played an important role in strength recovery. The dynamic mechanical properties of the crack healing zone gradually increased with the increase of deformation. Furthermore, the maximum value of impact toughness reached FR 2.0, and the recovery rate of impact toughness was above 96%. When the deformation continues to increase, the grains grew up after DRX, which made the impact energy decrease.

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Recovery of tensile properties of twinning-induced plasticity steel via electropulsing induced void healing

Cited by 61 publications

References 25 publications

Correlation of Materials Property and Performance with Internal Structures Evolvement Revealed by Laboratory X-ray Tomography

Correlation of Materials Property and Performance with Internal Structures Evolvement Revealed by Laboratory X-ray Tomography

Voids healing and carbide refinement of cold rolled M50 bearing steel by electropulsing treatment

Effect of Deformation Parameters on Microstructure and Mechanical Properties of Internal Crack Healing in As‐Cast 30Cr2Ni4MoV Steel

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