Microstructure Evolution During Hot Deformation of REX734 Austenitic Stainless Steel

Kulakov, M.A.; Huang, Jiannan; Ntovas, Michail; Moturu, Shanmukha

doi:10.1007/s11661-019-05558-6

Cited by 9 publications

(1 citation statement)

References 35 publications

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“…Local EDS measurements substantiate that they exhibit an increased niobium and chromium concentration in contrast to the solid solution matrix (Table 3C). These detected precipitates are the tetragonal CrNbN Z-phase as described previously by Kulakov et al 74 According to thermodynamic calculations with Thermo-Calc Software (Thermo-Calc Software AB, database TCFe10), this phase is stable at all temperatures and cannot be dissolved within the austenitic matrix by solution annealing at 1050 C. The calculated composition of the Z-phase (5.7% Fe, 28.8% Cr, 5.3% Mo and 45.7% Nb, 5.5% V, and 8.9% N) at 1050 C correlates with the results of the EDS mapping in Figure 3D and the EDS spot analysis in Table 3C.…”

Section: Scanning Electron Microscopy With Focused Ion Beammentioning

confidence: 70%

Microstructure‐dependent crevice corrosion damage of implant materialsCoCr28Mo6,TiAl6V4andREX734 under severe inflammatory conditions

et al. 2022

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Fretting corrosion is associated with increased risk of premature implant failure. In this complex in vivo corrosion system, the contribution of static crevice corrosion of the joined metal alloys is still unknown. The aim of this study was to develop a methodology for testing crevice corrosion behavior that simulates the physiological conditions of modular taper junctions and to identify critical factors on corrosion susceptibility. Samples of medical grade CoCr28Mo6 cast and wrought alloy, TiAl6V4 wrought alloy and REX 734 stainless steel were prepared metallographically and the microstructure was investigated using scanning electron microscopy (SEM). Crevice formers that mimic typical geometries of taper junctions were developed. Crevice corrosion immersion tests were performed in different physiological fluids (bovine serum or phosphate buffered saline with additives of 30 mM H 2 O 2 at pH = 1) for 4 weeks at 37 C. SEM with energy dispersive X-ray spectroscopy as well as focused ion beam were used to characterize the surface morphology, investigate present damages and identify the chemical composition of residues. Macroscopic inspection showed increased crevice corrosion susceptibility of TiAl6V4 and REX 734 under severe simulated inflammatory conditions. CoCr28Mo6 cast alloy exhibited degraded areas next to Cr-and Mo-rich precipitations that were located within the opposed crevices. The results indicate that aggressive electrolyte composition and crevice heights of 50-500 μm are critical influencing factors on crevice corrosion of biomedical alloys. Furthermore, manufacturing-related microstructure of common implant alloys determines the deterioration of corrosion resistance. The developed method should be used to enhance the corrosion resistance of common implant biomaterials by an adapted microstructure.

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Section: Scanning Electron Microscopy With Focused Ion Beammentioning

confidence: 70%

Microstructure‐dependent crevice corrosion damage of implant materialsCoCr28Mo6,TiAl6V4andREX734 under severe inflammatory conditions

et al. 2022

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Modeling of Metadynamic Recrystallization Kinetics and Recrystallization Mechanisms of V-Containing 12Cr Rotor Steel

Jiao

Liu

2020

J. of Materi Eng and Perform

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In order to study the metadynamic recrystallization (MDRX) behavior of 12Cr rotor steel, the double-hit hot compression tests were performed on a Gleeble1500D thermal simulator with temperatures of 1273-1373 K, strain rates of 0.001-0.05 s 21 and inter-pass times of 5-60 s. Based on the true stress-strain curves obtained at different deformation conditions, the effects of different deformation parameters on the MDRX softening behavior are discussed. Meanwhile, the microstructure was observed using an optical microscope, electron backscatter diffraction and transmission electron microscopy. Analysis showed that recovery was the main softening mechanism, followed by recrystallization. And the bulging at the grain boundary was the fundamental nucleation mechanism for MDRX. Furthermore, the kinetics model for MDRX of 12Cr rotor steel was established, which was verified to have an accurate capability of predicting MDRX softening behavior with a correlation coefficient of R = 0.9956.

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Microstructure Evolution of Polycrystalline Zinc during Tensile Testing at Room Temperature

Yue

et al. 2023

J. of Materi Eng and Perform

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Microstructure Evolution During Hot Deformation of REX734 Austenitic Stainless Steel

Cited by 9 publications

References 35 publications

Microstructure‐dependent crevice corrosion damage of implant materialsCoCr28Mo6,TiAl6V4andREX734 under severe inflammatory conditions

Microstructure‐dependent crevice corrosion damage of implant materialsCoCr28Mo6,TiAl6V4andREX734 under severe inflammatory conditions

Modeling of Metadynamic Recrystallization Kinetics and Recrystallization Mechanisms of V-Containing 12Cr Rotor Steel

Microstructure Evolution of Polycrystalline Zinc during Tensile Testing at Room Temperature

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