Formation of L12-ordered precipitation in an alumina-forming austenitic stainless steel via Cu addition and its contribution to creep/rupture resistance

Zhao, Bingbing; Fan, Jiantao; Liu, Yize; Zhao, Lin; Dong, Xianping; Sun, Feng; Zhang, Lanting

doi:10.1016/j.scriptamat.2015.07.019

Cited by 42 publications

(15 citation statements)

References 35 publications

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“…structure is observed. This secondary phase known as γ' and found in various Ni-based and Fe-based superalloys, including alumina-forming stainless steels, is reported to provide a strengthening effect, improving the high temperature mechanical properties [71,72,75,77,78,[85][86][87]91]. The study of the corrosion behaviour of Fe-Ni-Cr-Al model alloys, exposed to molten Pb containing 10 -6 wt.…”

Section: Discussionmentioning

confidence: 99%

“…Cr 23C6, NbC), Laves phase and γ' phase, on the mechanical properties, especially at high temperatures and such as B2-NiAl phase on alumina formation and stability, was intensively studied [69][70][71][72][73][74][75][76][77][78]. The influence of minor elements additions, such as Y, La, Hf, B, C, Ti, Cu, Mn, Mo, Si, on corrosion and mechanical properties at high temperatures and on workability was also investigated [79][80][81][82][83][84][85][86][87]. Based on the Ni content and the targeted alumina formation temperature range, the AFA steels are classified into three categories: (i) high Ni-content (30-35 wt.%), with relatively high strength, for applications in the temperature range ∼ 750-850°C, (ii) standard Ni-content (20-25 wt.%) for applications in the temperature range ∼ 750-950°C and (iii) low Ni-content (12-15 wt.%), for the temperature range ∼ 650-700°C [72].…”

Section: Introductionmentioning

confidence: 99%

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Corrosion resistance and microstructural stability of austenitic Fe–Cr–Al–Ni model alloys exposed to oxygen-containing molten lead

Shi

Jianu

Weisenburger

et al. 2019

Journal of Nuclear Materials

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The goal of the study was to determine the critical concentrations of Al, Cr and Ni, at which the quaternary Fe-Cr-Al-Ni model alloys, exposed to oxygen-containing molten Pb up to 600°C, are corrosion resistant, while preserving the austenite structure of the alloy matrix. Twelve alloys were designed to meet the above mentioned requirements; six of them showed corrosion resistance and preserved the austenite phase in the alloy bulk, during the exposure at 550°C and 600°C for 1000 hours to molten Pb containing 10-6 wt.% oxygen. Based on experimental results a general formula was substantiated as follows: Fe-(20-29)Ni-(15.2-16.5)Cr-(2.3-4.3)Al (wt.%). In case of temperatures below 550°C, the critical Cr content was 14.4 wt.%. Two corundum-type crystalline structures were identified as the constituent phases of the passivating scales, one being Cr2O3 and the other Al2O3-Cr2O3 solid solution. The average amount of Cr2O3 in the Al2O3-Cr2O3 solid solution, found in the passivating scales of the Fe-Cr-Al-Ni model alloys, was estimated at ≈ 40 wt.% at 550°C and ≈ 35 wt.% at 600°C. A transitional layer, consisting of Fe-and Ni-enriched austenitic matrix and exhibiting randomly distributed intermetallic B2-(Ni,Fe)Al, was formed below the oxide scale up to a depth of two microns. The austenite, as matrix, and Ni3(Al,Fe) as precipitates are the microstructural phases of the bulk alloys after exposure for 1000h at 600°C to oxygen-containing molten Pb.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Corrosion resistance and microstructural stability of austenitic Fe–Cr–Al–Ni model alloys exposed to oxygen-containing molten lead

Shi

Jianu

Weisenburger

et al. 2019

Journal of Nuclear Materials

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“…The drop in strength his even more pronounced above about 0.6Tm which corresponds to the service temperature of the materials presented in this paper [33]. Consequently, at service temperature, the NiAl phase does not remain an effective obstacle for dislocation motion [12,13,[16][17][18][19]38] and a loss of creep properties is observed. This agrees well with the TEM image presented in Figure 15 which reveals the presence of dislocation lines inside a NiAl precipitate characteristic of the ductile behavior of the NiAl phase.…”

Section: Discussion: Link Between Microstructure and Creep Propertiesmentioning

confidence: 73%

“…% are used for structural purpose in fossil energy conversion and combustion system applications which require good creep and oxidation properties between 650 and 900°C. Main hardening precipitates in these alloys are MC (M stands for metal like Nb and Ti) carbides and intermetallic compounds such as NiAl, Fe 2(Mo, Nb)-Laves and Ni3Al phases [13][14][15][16][17][18][19]. Addition of high Al level can destabilize the single-phase austenitic matrix by promoting the formation of the weak body-centered cubic α-Fe phase resulting in a drop of creep properties [6,20].…”

Section: Introductionmentioning

confidence: 99%

Microstructure influence on creep properties of heat-resistant austenitic alloys with high aluminum content

Facco

Couvrat

Magné

et al. 2020

Materials Science and Engineering: A

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This work focusses on the link between microstructure and creep properties for heat-resistant austenitic alloys with high aluminum content (3-5 wt. %). An emphasis was put on the coupling of thermodynamic simulations, microstructural characterizations by scanning electron microscopy and transmission electron microscopy, and creep testing. The phase predictions performed by the calculation of phase diagrams method are in good agreement with the observed microstructure after creep at 1000°C and 1050°C. Correlation between creep properties and microstructure characterizations at 1000°C and 1050°C revealed that NiAl and α' (chromium-rich base centered cubic phase) phases are deleterious for the creep properties at service temperature. Several high Al-content alloys are selected in order to replace the chromia-forming alloys standardly used in cracking furnaces.

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“…In addition, they have good mechanical, electrical, and thermal properties, and workability . Cu is used in many Fe‐ and Ni‐based alloys for strengthening, corrosion resistance, and antibacterial purpose . It is now generally agreed that initially, copper precipitates out from the supersaturated solid solution as bcc copper‐rich clusters and copper precipitation in ferritic iron generally follows the following precipitation sequence: supersaturated solid solution → bcc Cu → 9R Cu → ϵ‐Cu (fcc).…”

Section: Introductionmentioning

confidence: 99%

Effect of Continuous Annealing Temperature on Microstructure and Properties of Ultra-Purified Ferritic Stainless Steel

Sun

Zhang

Zeng

et al. 2016

steel research int.

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Effect of continuous annealing temperature on mechanical properties, formability, work hardening rate, texture, and corrosion resistance of ultra‐purified ferritic stainless steel is analyzed by means of tensile test, electron back scattering diffraction, and electrochemical tests. The results show that with the increase of continuous annealing temperature during 850–940 °C, tensile strength and yield strength of the tested steel reduce and then rise slightly and decrease at last. Elongation increases sharply with the rise of continuous annealing temperature and then kept approximately constant. At 910 °C, the best formability and comprehensive performance are obtained, and the strength and elongation achieve best comprehensive performance. The grains near the {111} <112> orientation grow up selectively. The higher continuous annealing temperature, the more obvious the tendency of growing and thus the more the γ fiber texture content. The low energy and low ∑ CSL grain boundaries composed of textures are the reasons why the corrosion resistance of specimen presents the changing trend similar to texture orientation. With the increases of continuous annealing temperature, the passive potential range and the stability of the surface film first increase and then decrease, while the pitting corrosion potential first decrease slightly and then increase sharply.

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Formation of L12-ordered precipitation in an alumina-forming austenitic stainless steel via Cu addition and its contribution to creep/rupture resistance

Cited by 42 publications

References 35 publications

Corrosion resistance and microstructural stability of austenitic Fe–Cr–Al–Ni model alloys exposed to oxygen-containing molten lead

Corrosion resistance and microstructural stability of austenitic Fe–Cr–Al–Ni model alloys exposed to oxygen-containing molten lead

Microstructure influence on creep properties of heat-resistant austenitic alloys with high aluminum content

Effect of Continuous Annealing Temperature on Microstructure and Properties of Ultra-Purified Ferritic Stainless Steel

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