Multiphase Strengthening of Nanosized Precipitates in a Cost‐Effective Austenitic Heat‐Resistant Steel

Du, Jia; Zhang, Y F; Wang, ShaoLin; Zhou, ShuLiang; Liu, PingPing; Xie, Xiangyu; Zhan, Qian

doi:10.1002/srin.202000122

Cited by 5 publications

(5 citation statements)

References 34 publications

(31 reference statements)

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“…Some researchers found that MX phase converts to Z phase in austenitic heat‐resistant steels during prolonged aging time. [ 21–23 ] The formation of Z phase is related to the diffusion of Cr element, due to the Cr content having a significant effect on the driving force of Z phase. Li et al [ 23 ] revealed the mechanism for the formation of Z phase in 25Cr–20Ni–Nb–N.…”

Section: Precipitationmentioning

confidence: 99%

Precipitation and Properties at Elevated Temperature in Austenitic Heat‐Resistant Steels—A Review

Wang

Wei

et al. 2020

steel research int.

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The austenitic heat‐resistant steels are significant materials used in boilers and nuclear reactors, owing to the excellent creep, fatigue, corrosion resistance, and mechanical properties. The precipitation and properties degenerate with the increasing temperature. It is necessary to clarify the main precipitation and properties under the service situation. Herein, the characteristic of main precipitation and the potential degraded mechanism of creep, fatigue, oxidation resistance, and corrosion resistance at high temperature are briefly reviewed. The main secondary phases under prolonged service environment include MX phase, M23C6 carbide, Z phase, Laves phase, and σ phase. Precipitation scattered uniformly is conductive to strength properties of steel and vice versa. Coarsening precipitation and the decrease of dislocation density are critical reason for the deteriorated mechanical properties at high temperature. The protective oxide films destroyed after exposure to boiler gas lead to failure of materials.

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Section: Precipitationmentioning

confidence: 99%

Precipitation and Properties at Elevated Temperature in Austenitic Heat‐Resistant Steels—A Review

Wang

Wei

et al. 2020

steel research int.

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“…In comparison with conventional materials, SP2215 steel provides superior mechanical properties while utilizing less chromium (Cr) and nickel (Ni). Most studies have revealed that the superior properties of SP2215 steel under high temperatures can be attributed to the stabilization and strengthening effect of niobium (Nb) and nitrogen (N), as well as the presence of a Cu-rich phase [11][12][13][14]. Du et al [12] found that the nano-precipitation formed by the precipitation of copper particles, niobium-rich carbonitides, and NbCrN phases enhances the materials' high-temperature mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

“…Most studies have revealed that the superior properties of SP2215 steel under high temperatures can be attributed to the stabilization and strengthening effect of niobium (Nb) and nitrogen (N), as well as the presence of a Cu-rich phase [11][12][13][14]. Du et al [12] found that the nano-precipitation formed by the precipitation of copper particles, niobium-rich carbonitides, and NbCrN phases enhances the materials' high-temperature mechanical properties. This steel also has significant creep strength at high temperatures, and shows only a slight decrease in fatigue strength at a peak stress below 450 MPa at 700 • C [14].…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Steam and Atmospheric Oxidation Characteristic of a Heat-Resistant SP2215 Steel

Xu,

Wu,

Huang

et al. 2024

Coatings

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The high-temperature oxidation performance of SP2215 has become an important issue when they were used as superheaters and reheaters exposed to two different high-temperature environments. In this study, the oxidation behavior of SP2215 steel was investigated under steam and an atmosphere of 650–800 °C for 240 h. The microstructural and chemical characterization of the samples were performed using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), a glow discharge optical emission spectrometer (GD-OES), and atomic force microscope (AFM). The kinetic curves of oxidation revealed excellent oxidation resistance under both environments, but significant different oxidation characteristics, oxide film composition, and structure were obvious. In the steam experiment, selective intergranular oxidation was evident at relatively low temperatures, which was attributed to the preference absorption of supercritical water molecules at the grain boundary. Conversely, a double-layer structure of outer Fe2O3 and a small amount of Fe3O4 and inner Cr2O3 was formed uniformly at 800 °C. In the high-temperature atmosphere experiment, a protective chromium film was dominant at 650–700 °C, and a loose multicomponent oxide film was formed at 750–800 °C, primarily consisting of Cr2O3, spinel FeCr2O4, and CuO.

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“…Noteworthily, some of the austenitic stainless steels, such as TP304H and TP347H, used to produce the superheater and reheater for coal-fired power plant boilers can also be used for biomass boilers. Therefore, some new high-Cr–Ni materials, such as SP2215, Sanicro25, and HT700T, − developed for high-parameter power plant boilers are equally promising for biomass boiler applications. However, the corrosion behavior of these materials under a biomass incineration atmosphere has not been reported.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behavior of High-Cr–Ni Materials in Biomass Incineration Atmospheres

et al. 2022

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In this paper, the corrosion test of high-Cr–Ni tubes was carried out in a biomass incinerator by replacing the original heated surface tube with a test tube. The investigated materials are high-Cr–Ni stainless steels (TP347H, SP2215, and Sanicro25) and alloy (HT700T). Long-term services (>4000 h) to investigate the corrosion rates and corrosion characteristics of the materials have been carried out. The appearance, element content, and composition of corrosion products after corrosion of the specimens were analyzed. Analysis indicates that the deposits are mainly composed of alkali metal salts, iron oxides, iron sulfates, and complex salts. Moreover, the corrosion morphology of the materials with different Cr–Ni contents varies greatly. TP347H has a high corrosion rate (0.11 mm/1000 h) with intergranular corrosion cracks and pitting on the windward side. However, the corrosion pattern of HT700T is comprehensive corrosion and the corrosion rate is low (0.015 mm/1000 h). Using corrosion rate as a criterion for corrosion resistance, HT700T has the highest corrosion resistance, while TP347H has the lowest. The corrosion behavior is also related to the corrosion resistance index (CI) value based on the content of critical elements. The order of material corrosion resistance predicted by the CI value is the same as reflected by the corrosion rate.

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Multiphase Strengthening of Nanosized Precipitates in a Cost‐Effective Austenitic Heat‐Resistant Steel

Cited by 5 publications

References 34 publications

Precipitation and Properties at Elevated Temperature in Austenitic Heat‐Resistant Steels—A Review

Precipitation and Properties at Elevated Temperature in Austenitic Heat‐Resistant Steels—A Review

High-Temperature Steam and Atmospheric Oxidation Characteristic of a Heat-Resistant SP2215 Steel

Corrosion Behavior of High-Cr–Ni Materials in Biomass Incineration Atmospheres

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