A Modified HR3C Austenitic Heat-Resistant Steel for Ultra-supercritical Power Plants Applications Beyond 650 °C

Zhu, Changchun; Yuan, Yong; Zhang, P.; Yang, Zhigang; Zhou, Yongli; Huang, Jinyang; Yin, Hong Fei; Dang, Yingying; Zhao, Xinbao; Lu, Jin Tao; Yan, Jingbo; You, Cai

doi:10.1007/s11661-017-4424-z

Cited by 19 publications

(9 citation statements)

References 12 publications

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“…And the rupture elongations of T8 alloy are comparable with those of HR3C alloy at various conditions. The Larson-Miller parameters (LMPs) of HR3C alloy [28] and T8 alloy are shown in Fig. 9, which shows that the stress rupture resistance of T8 alloy is better than that of HR3C alloy.…”

Section: Stress Rupture Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

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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Section: Stress Rupture Propertiesmentioning

confidence: 99%

“…The data of HR3C alloy are obtained from Ref. [28]. At 650°C/250 MPa, 700°C/180 MPa, and 750°C/130 MPa, the rupture lives of T8 alloy are almost 1.4 times than that of HR3C alloy.…”

Section: Stress Rupture Propertiesmentioning

confidence: 99%

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 three steels have good oxidation resistance, among which HR3C steel has the strongest oxidation resistance, Super304H steel is the second, and TP347HFG steel is the weakest. At present, there are few reports on the high temperature oxidation performance analysis of HR3C steel, and such research is of great significance for ensuring the safe use of materials [11][12][13][14], improving the performance of materials and exploring the development of new materials [15][16][17][18]. In this paper, the specimens of HR3C steel after being oxidized in water vapor at 700°C are analyzed to explore the oxidation law of HR3C steel at high temperature in water vapor, and provide reference for engineering practice and material modification.…”

Section: Introductionmentioning

confidence: 99%

Analysis on Oxidation Behavior of HR3C Steel at 700°C in Water Vapor

Song

Wang

2022

mater

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HR3C is an advanced heat-resistant alloy, and its high-temperature oxidation resistance directly determines the service performance of the material. Therefore, exploring the high-temperature oxidation behavior of HR3C is of great significance for the theoretical research and practical application of the material. The oxidation kinetic curve, oxide film morphology, oxide film composition, and oxide film phase composition of HR3C samples in the supply state after being oxidized in water vapor at 700°C for 50h, 150h, 250h, 350h, 450h, 550h and 600h were analyzed by SEM (Scanning Electron Microscopy), EDS (Energy Dispersive Spectroscopy) and XRD (X-ray diffraction). The results show that the oxidation kinetic curve of the material conforms to the parabolic law, the oxide film first forms a lamellar oxide, and the lamellar oxide film grows alternately to form a loose and porous oxide film surface, the oxide is composed of three oxides: Fe 3 O 4 , FeCr 2 O 4 and Fe 2 O 3 . The FeCr 2 O 4 is a spinel compound, which can form a dense oxide film, and the diffusion coefficient of metal ions in it is small, which hinders the diffusion and mass transfer of ions, thereby improving the high temperature oxidation resistance of stainless steel. The element Cr is mainly enriched in the inner oxide layer, and the element Fe is relatively high in the outer oxide layer.

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“…In recent years, ultra-supercritical thermal power units with improved thermal efficiency have been attracting increasing interest in many countries, in order to reduce the emission of CO 2 and hazardous gases [1][2][3]. Ultra-supercritical thermal power units require castings to work in conditions of 30 MPa/600 • C or even higher pressures and temperatures for long durations.…”

Section: Introductionmentioning

confidence: 99%

Thermal Simulation Study on the Solidification Structure and Segregation of a Heavy Heat-Resistant Steel Casting

Wang

Zhong

et al. 2019

Metals

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The prediction and controlling of the solidification structure and macro-segregation in heavy steel casting, which is usually produced in limited quantities, was a conundrum in the foundry field. In this work, the cooling and solidification processes of a 16 t CB2 ferritic heat-resistant steel (FHRS) valve casting were reproduced by studying the solidification behavior of three typical units through a thermal simulation method. The results indicate that the types of casting without chilling have the most uneven distribution of solutes and hardness, while those types of casting in which parts are solidified by chilling are much more uniform. The macro-segregation degrees of B, C, Nb, P, Cr, Mo, Si, V and Mn decrease gradually during heavy casting of CB2 ferritic heat-resistant steel. Of them, B, C, Nb, and P are solutes prone to segregation, and the maximum macro-segregation index of B can even reach 15. The macro-segregation tendencies of Cr, Mo, Si, V, and Mn are relatively small. Further studies on the last solidification portion of samples taken by electron microprobe reveal that large-sized precipitates such as MnS and NbxC are easily formed due to solute enrichment, and the sizes of these precipitates were distributed from dozens to hundreds of micrometers.

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A Modified HR3C Austenitic Heat-Resistant Steel for Ultra-supercritical Power Plants Applications Beyond 650 °C

Cited by 19 publications

References 12 publications

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

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

Analysis on Oxidation Behavior of HR3C Steel at 700°C in Water Vapor

Thermal Simulation Study on the Solidification Structure and Segregation of a Heavy Heat-Resistant Steel Casting

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