Hot-deformation induced static recrystallization and nano-MX precipitation in a low activation martensitic steel

Zhou, Jinhua; Shen, Y.F.; Xue, W.Y.; Jia, Nan

doi:10.1016/j.jnucmat.2021.153190

Cited by 9 publications

(3 citation statements)

References 36 publications

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“…THT is characterized by the preferential location of M23C6 carbides at the boundaries of mar- Nanoscale MX type particles are observed to pin the dislocations. These structural elements are characteristic of ferritic-martensitic steels [12,15,17,25]. The microstructure of EP-823 steel after THT and HTMT is qualitatively similar.…”

Section: Temmentioning

confidence: 77%

“…It was shown [4][5][6][7][12][13][14][15][16][17][18][19][20][21] that various thermomechanical treatments, including those using plastic deformation in the austenitic region, make it possible to effectively change the above-mentioned parameters of the microstructure and the carbide subsystem of ferritic-martensitic steels. These changes mainly consist of a smaller width of martensitic packets and lamella, an increased dislocation density, a decreased size of coarse phases of the M 23 C 6 type and an increased dispersion of nanoscale carbides (carbonitrides) of the MX type [11,12,[15][16][17][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

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The Microstructure and Mechanical Properties of Ferritic-Martensitic Steel EP-823 after High-Temperature Thermomechanical Treatment

Litovchenko

Almaeva

Polekhina

et al. 2022

Metals

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The effect of high-temperature thermomechanical treatment (HTMT) with plastic deformation by rolling in austenitic region on the microstructure and mechanical properties of 12% chromium ferritic-martensitic steel EP-823 is investigated. The features of the grain and defect microstructure of steel are studied by Scanning Electron Microscopy with Electron Back-Scatter Diffraction (SEM EBSD) and Transmission Electron Microscopy (TEM). It is shown that HTMT leads to the formation of pancake structure with grains extended in the rolling direction and flattened in the rolling plane. The average sizes of martensitic packets and ferrite grains are approximately 1.5–2 times smaller compared to the corresponding values after traditional heat treatment (THT, which consists of normalization and tempering). The maximum grain size in the section parallel to the rolling plane increases up to more than 80 µm. HTMT leads to the formation of new sub-boundaries and a higher dislocation density. The fraction of low-angle misorientation boundaries reaches up to ≈68%, which exceeds the corresponding value after HTMT (55%). HTMT does not practically affect the carbide subsystem of steel. The mechanical properties are investigated by tensile tests in the temperature range 20–700 °C. It is shown that the values of the yield strength in this temperature range after HTMT increase relative to the corresponding values after THT. As a result of HTMT, the elongation decreases. A significant decrease is observed in the area of dynamic strain aging (DSA). The mechanisms of plastic deformation and strengthening of ferritic-martensitic steel under the high-temperature thermomechanical treatments are also discussed.

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Section: Temmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

The Microstructure and Mechanical Properties of Ferritic-Martensitic Steel EP-823 after High-Temperature Thermomechanical Treatment

Litovchenko

Almaeva

Polekhina

et al. 2022

Metals

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show abstract

“…As for the details of the local microstructure shown in the upper right corner, the fine SRXed grains are clearly found inside the micro-shear band and at the grain boundaries, respectively. It may be attributed to that, that the micro-shear band, large deformation grains and grain boundaries have high storage energy after cold rolling, where the SRX process occurs preferentially during the heat treatment [22]. With the extension of holding time, as shown in Figure 2c,d, the degree of SRX increases significantly, while the elongated β grains (un-SRXed grains) decrease continuously.…”

Section: Heat Treatment Microstructure Characteristicmentioning

confidence: 84%

Static Recrystallization Behavior and Texture Evolution during Annealing in a Cold Rolling Beta Titanium Alloy Sheet

Zhang

Wang

Cheng

et al. 2022

Metals

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In this study, the cold rolling microstructure and static recrystallization mechanism of the high strength titanium alloy Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe were systematically investigated. Results show that the cold rolling microstructure is mainly composed of the elongated deformed β grains containing micro-shear bands. After annealing at 815 °C for 2 min, the fine SRXed grains are observed, mainly concentrated in the micro-shear band, the grain boundary and the interior of the deformed grain. The sub-grain structure obtained by static recovery inside the deformed grain produces continuous SRX during the annealing treatment. Meanwhile, geometric and discontinued SRXed grains are also observed in the large deformed β grain and at the trigeminal grain boundaries, respectively. Many ultra-fine grains appear inside the micro-shear band, exhibiting a phenomenon of the micro-shear band assisting SRX. With the increase in the annealing holding time, the elongated β grains are significantly refined and the degree of recrystallization is continuously improved. In addition, the recrystallization behavior also results in a significant change in the fiber texture. With the extension of the annealing holding time, the rolling texture type evolves gradually, with the {111} <112> γ-fiber texture to weak α-fiber, γ-fiber, and Goss-fiber.

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Ductile ultrastrong China low activation martensitic steel with lamellar grain structure

Zhou,

Wang,

Ritchie

et al. 2023

International Journal of Plasticity

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Hot-deformation induced static recrystallization and nano-MX precipitation in a low activation martensitic steel

Cited by 9 publications

References 36 publications

The Microstructure and Mechanical Properties of Ferritic-Martensitic Steel EP-823 after High-Temperature Thermomechanical Treatment

The Microstructure and Mechanical Properties of Ferritic-Martensitic Steel EP-823 after High-Temperature Thermomechanical Treatment

Static Recrystallization Behavior and Texture Evolution during Annealing in a Cold Rolling Beta Titanium Alloy Sheet

Ductile ultrastrong China low activation martensitic steel with lamellar grain structure

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