Microstructural study in a Fe–Ni-base superalloy during creep–rupture at intermediate temperature

Yan, Jingbo; Gu, Yubei; Sun, Fei; Yuyama, M.; Zhong, Zhihong; Yuan, Yong; J, Lu

doi:10.1016/j.msea.2015.04.093

Cited by 25 publications

(2 citation statements)

References 28 publications

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“…According to [7,21], one of the effects of the influence of temperature on the microstructure of austenitic steels is the loss of twins. In the opinion of [32], the relatively high El. of HR3C steel after service may result from the grain rotation during deformation, which is probably related to the formation of the chromium-depleted area adjacent to the grain boundaries.…”

Section: Mechanical Properties Of Hr3c Steel After Servicementioning

confidence: 95%

The Effect of Service on Microstructure and Mechanical Properties of HR3C Heat-Resistant Austenitic Stainless Steel

et al. 2020

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The physical metallurgical tests were performed on the test samples made of HR3C steel, taken from a section of a pipeline in the as-received condition and after approximately 26,000 h of service at 550 °C. In the as-received condition, the test material had austenitic microstructure with numerous large primary Z-phase precipitates inside the grains. The service of the test steel mainly contributed to the precipitation processes inside the grains and at the grain boundaries. After service, the following precipitates were identified in the microstructure of the test steel: Z-phase (NbCrN) and M23C6 carbides. The Z-phase precipitates were observed inside the grains, whereas M23C6 carbides - at the boundaries where they formed the so-called continuous grid. The service of the test steel contributed to the growth of the strength properties, determined both at room and elevated temperature (550, 600 °C), compared to the as-received condition. Moreover, the creep properties of HR3C steel after service were higher than those of the material in the as-received condition. The increase in the strength properties and creep resistance was connected with the growth of strengthening of the test steel by the precipitation of Z-phase and M23C6 carbides.

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Section: Mechanical Properties Of Hr3c Steel After Servicementioning

confidence: 95%

The Effect of Service on Microstructure and Mechanical Properties of HR3C Heat-Resistant Austenitic Stainless Steel

et al. 2020

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“…Figure 8d shows that grains are elongated approximately along the tensile stress direction at room temperature. A large number of slip bands within the grains indicate that significant grain deformation occurs during the tensile test at room temperature [11,20,21], which is confirmed by the large elongation of 61% at room temperature. However, grain deformation causes a great number of grain boundaries parallel with the direction of stress direction.…”

Section: Tensile Propertiesmentioning

confidence: 77%

Microstructures and Mechanical Properties of a Newly Developed Austenitic Heat Resistant Steel

Liu

Chu

Yuan

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

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The effect of heat treatment on the microstructures and mechanical properties of a newly developed austenitic heat resistant steel (named as T8 alloy) for ultra-supercritical applications have been studied. Results show that the main phases in the alloy after solution treatment are c and primary MX. Subsequent aging treatment causes the precipitation of M 23 C 6 carbides along the grain boundaries and a small number of nanoscale MX inside the grains. In addition, with increasing the aging temperature and time, the morphology of M 23 C 6 carbides changes from semi-continuous chain to continuous network. Compared with a commercial HR3C alloy, T8 alloy has comparable tensile strength, but higher stress rupture strength. The dominant cracking mechanism of the alloy during tensile test at room temperature is transgranular, while at high temperature, intergranular cracking becomes the main cracking mode, which may be caused by the precipitation of continuous M 23 C 6 carbides along the grain boundaries. Typical intergranular cracking is the dominant cracking mode of the alloy at all stress rupture tests.

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Effect of Rolling on Microstructure Evolution and Plastic Deformation Behavior of A473M Martensitic Stainless Steel

Wang

Zhang

Wang

et al. 2022

steel research int.

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Herein, the surface of A473M martensitic stainless steel is strengthened by rolling processing technology. The microstructure evolution and plastic deformation behavior are characterized by electron backscatter diffraction (EBSD). The experimental results indicate that residual compressive stress will be formed on the surface of A473M steel after rolling, and the maximum value can reach 946 MPa. The surface roughness decreases significantly from 383 to 62.7 nm, which is only 1/5 of the matrix. The microstructure of the rolled samples is obviously refined, and <101>//ND texture is formed. The nanohardness of the hardened layer on the sample surface increases from 2.5 to 4.8 GPa, and the elastic modulus increases from 140 to 217 GPa. Compared with the matrix, the tensile strength and yield strength after rolling are increased by 40% and 22%, respectively. EBSD analysis indicates that the texture of the rolled samples after tensile changed from the <101>//TD direction of the matrix to the <101>//TD and <111>//RD directions.

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Microstructural study in a Fe–Ni-base superalloy during creep–rupture at intermediate temperature

Cited by 25 publications

References 28 publications

The Effect of Service on Microstructure and Mechanical Properties of HR3C Heat-Resistant Austenitic Stainless Steel

The Effect of Service on Microstructure and Mechanical Properties of HR3C Heat-Resistant Austenitic Stainless Steel

Microstructures and Mechanical Properties of a Newly Developed Austenitic Heat Resistant Steel

Effect of Rolling on Microstructure Evolution and Plastic Deformation Behavior of A473M Martensitic Stainless Steel

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