Critical Dynamic Recrystallization Model and Nucleation Mechanisms of an Alumina-Forming Austenitic Stainless Steel during Hot Deformation

Zheng, Qiwen; Chen, Leli; Luo, Rui; Qiu, Yu; Peng, Ching-Tun; Liu, Tian; Cui, Shugang; Cao, Yun; Gao, Peihu; Cheng, Xiaonong

doi:10.1007/s12666-020-02096-3

Cited by 6 publications

(2 citation statements)

References 28 publications

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“…The localized misorientation of L2 perpendicular to the grain boundary direction (Figure 10b) fluctuates in a low range, and the cumulative misorientation shows a continuously increasing trend, indicating that the GND boundary is well developed. [ 50 ] When the sample is deformed at 50%, the density of LAGBs increases within the deformed grains. From Figure 10c,d, it can be found that with the distance increases, there are many peaks greater than 2° in the local misorientation, and the cumulative misorientation also increases rapidly and more than 15°.…”

Section: Resultsmentioning

confidence: 99%

Thermal Deformation Characteristics and Dynamic Recrystallization Mechanism of Incoloy 800H Alloy under Different Deformations

Jia,

Zhang,

Wang

et al. 2023

Adv Eng Mater

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Incoloy 800H alloy has excellent high‐temperature mechanical properties and broad application prospects. However, the dynamic recrystallization (DRX) behavior of this alloy at different deformations has been little studied. The thermal deformation characteristics and DRX mechanisms of Incoloy 800H alloy are studied by thermal compression tests. Quantitative analysis of grain size, DRX fraction, misorientation distribution, and twin boundaries under different deformation degrees is conducted using electron‐backscattered diffraction. Furthermore, the evolution characteristics of dislocations and grains are observed through transmission electron microscopy. It is found that the proportion of DRX improves with increasing deformation significantly. In the DRX process, discontinuous DRX (DDRX) is the main nucleation mechanism, while continuous DRX (CDRX) serves as an auxiliary nucleation mechanism. As the deformation increases, the CDRX + DDRX mechanisms can also be observed simultaneously in the high‐density dislocation region near the grain boundary. In addition, the ratio of ∑3 boundaries first decreases and then increases as the deformation increases. The initial twins gradually disappear due to the increase in deformation, and new twins are formed within the DRX grains. Twins can promote grain boundary bulging, provide more nucleation sites for DRX, and have a significant promoting effect on DRX.

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Section: Resultsmentioning

confidence: 99%

Thermal Deformation Characteristics and Dynamic Recrystallization Mechanism of Incoloy 800H Alloy under Different Deformations

Jia,

Zhang,

Wang

et al. 2023

Adv Eng Mater

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show abstract

“…Specifically, promoting the amount of fine precipitation could increase the high temperature capability of materials [14,15]. So far, this steel has attracted more research interests and attention to alloying elements that seriously affect mechanical properties and oxidation resistance for high-temperature application [16][17][18]. Due to a wide composition range for steels, so to find the optimum combination of element design is very important.…”

Section: Introductionmentioning

confidence: 99%

Effects of aluminum additions on the microstructure and mechanical properties of alumina‐forming austenitic stainless steels

Sun,

Liu,

Zhou

et al. 2023

Materialwissenschaft Werkst

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The mechanical properties, including tensile and impact properties at different testing temperatures of alumina‐forming austenitic steels (25 % nickel, 20 % chromium) with different aluminum contents (0, 2.5 %, 5 % and 8 %) were investigated. Scanning and transmission electron microscopy together with tensile and impact properties tests were conducted. The results showed that the tensile strength of steels at 298 K increased obviously along with aluminum contents increasing, while plasticity decreased at the same, which attributed to the higher volume fraction and number density of spherical NiAl precipitation together with main ferrite in matrix. In addition, spherical NiAl particles dispersed easily in ferrite. In particular, the ultimate tensile strength of the sample with 8 % aluminum could reach 1398 MPa, with the elongation of 14 % at 298 K. However, NiAl precipitations would lose strengthening effects at high temperatures, but the plasticity could be improved. In addition, the sample with 5 % aluminum showed better comprehensive properties by comparison to other samples, and the ultimate tensile strength was 1018 MPa and 491 MPa at 298 K and 973 K with the elongation of 26 % and 43 %, respectively, enabling it to be promising material for industrial application in advanced nuclear systems.

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Study on Recrystallization Initiation Model and Microstructure Evolution Mechanism of 18CrNimo7-6 Steel During Hot Deformation

Xie

Chen²,

Zhu

et al. 2023

Trans Indian Inst Met

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Critical Dynamic Recrystallization Model and Nucleation Mechanisms of an Alumina-Forming Austenitic Stainless Steel during Hot Deformation

Cited by 6 publications

References 28 publications

Thermal Deformation Characteristics and Dynamic Recrystallization Mechanism of Incoloy 800H Alloy under Different Deformations

Thermal Deformation Characteristics and Dynamic Recrystallization Mechanism of Incoloy 800H Alloy under Different Deformations

Effects of aluminum additions on the microstructure and mechanical properties of alumina‐forming austenitic stainless steels

Study on Recrystallization Initiation Model and Microstructure Evolution Mechanism of 18CrNimo7-6 Steel During Hot Deformation

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