Precipitation behavior of Fe2Nb Laves phase on grain boundaries in austenitic heat resistant steels

Chen, S.W.; Zhang, C.; Xia, Zhen; Ishikawa, H.; Yang, Zhigang

doi:10.1016/j.msea.2014.07.104

Cited by 62 publications

(16 citation statements)

References 11 publications

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“…The effect of the Laves phase precipitated inside the grains on steel properties depends on its size and volume fraction. The coagulation of the Laves phase during service results in disappearance of this effect[9,10,31,[41][42][43][44].…”

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confidence: 99%

Precipitation Processes in Creep-Resistant Austenitic Steels

Golański¹,

Zieliński²,

Purzyńska³

2017

Austenitic Stainless Steels - New Aspects

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Creep-resisting austenitic steels constitute a group of construction materials which can work in the conditions of creep for the temperature range from 550 to 700°C. The service of austenitic steels leads to the progressive degradation of their microstructure, which results in the changes of functional properties. The main mechanisms of degradation of the austenitic steel microstructure include the processes of matrix softening, the processes of precipitation and matrix depletion of the interstitial and substitution elements. Precipitation processes in austenitic steels are a very important indicator, which allows the advancement of microstructure degradation processes in these steels to be determined. Hence, the knowledge of the impact of individual secondary phases on the microstructure and properties of austenitic steels plays a very important role in diagnosing the components and equipment of the power boiler system and makes it possible to forecast the time of safe operation of systems made from these steels. Based on own studies and data from literature, this paper will present the characteristics of secondary phase precipitates occurring in creep-resistant austenitic steels during their operation at an elevated/high temperature. The effect of secondary precipitates on mechanical properties of these steels will be discussed too.

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mentioning

confidence: 99%

Precipitation Processes in Creep-Resistant Austenitic Steels

Golański¹,

Zieliński²,

Purzyńska³

2017

Austenitic Stainless Steels - New Aspects

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“…Tarigan et al reported that creep life was extended without ductility loss even with increased Laves phase grain boundary precipitation in Fe-20Cr-30Ni-2Nb (at%) [14,15] and called the strengthening mechanism a "grain boundary precipitation strengthening mechanism" (GBPS) which they proposed was caused by decreased grain boundary deformation in sections of the grain boundary covered by the Laves phase. In Chen et al's study of Fe-20Cr-30Ni-2Nb-0.03B (at%) it was also concluded that precipitation of the Laves phase on the grain boundaries enhanced creep resistance [10]. These alloys did not include additions of Al so instead of just Laves phase, both Laves and NiAl precipitates are present on the matrix and grain boundary.…”

Section: Resultsmentioning

confidence: 99%

“…AFA stainless steels, which exist over a wide compositional range, have shown promising results but further study is needed to find the optimum combination of alloying elements that provide the most effective creep strengtheners at reasonable cost for commercialization [1]. Even within particular grades of AFAs, the influence of precipitate phases on creep strength is complex and a wide variety of creep strengths can be obtained with relatively small changes in alloying elements and phases [1,9,10].…”

Section: Introductionmentioning

confidence: 99%

“…The AB 2 -type Laves phase generally comes in one of three forms: hexagonal MgZn 2 (C14), cubic MgCu 2 (C15) or hexagonal MgNi 2 (C36) [11]. Even though Laves phase has been shown to be harmful in some ferritic steels [12], decreasing their toughness and strength and precipitating at the grain boundaries, some research has indicated their potential for strengthening in both AFA stainless steels and alloys with similar compositions [7,10,[13][14][15][16]. Use of the C14 Fe 2 Nb as a strengthener in an AFA steel is advantageous because it has a high melting temperature of 1641 1C, exists in equilibrium with f.c.c.…”

Section: Introductionmentioning

confidence: 99%

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The effect of aging on the microstructure and mechanical behavior of the alumina-forming austenitic stainless steel Fe–20Cr–30Ni–2Nb–5Al

Trotter

Baker

2015

Materials Science and Engineering: A

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“…Although Laves phase usually is considered detrimental for mechanical property of traditional steels [23]. Some research works also demonstrate the strengthen effect of Laves phase in austenitic steels, as the lattice misfit degree between Laves phase and austenitic phase is very small, and the precipitate with low misfit to matrix can improve mechanical property [24][25][26][27].…”

Section: Microstructure Evolution After Corrosion Testmentioning

confidence: 99%

Investigation of microstructure and liquid lead corrosion behavior of a Fe-18Ni-16Cr-4Al base alumina-forming austenitic stainless steel

Chen

Wang

Tsisar

et al. 2020

Mater. Res. Express

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The microstructure of an alumina-forming austenitic stainless steel with a composition design of Fe-18Ni-16Cr-4Al-2Mo-0.4 Nb (in wt%) is characterized. The steel contains about 75 vol% austenitic phase and 25 vol% ferritic phase. B2-NiAl precipitates with round shape can be found only in the ferritic phase in the as-rolled sample. The corrosion behavior in static liquid lead with different oxygen content of 10 −9 and 10 −6% by mass at 700°C for 1000 h is investigated. After exposure for 1000 h in liquid lead with oxygen content of 10 −9% , obvious lead penetration combined with nickel dissolution is found. In the case of liquid lead with 10 −6 % oxygen content, a thin oxide layer can be formed on the surface, thus protecting the steel from liquid lead attack. After the corrosion test, significant precipitations are found in both austenitic and ferritic phases in the matrix of the steel.

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Precipitation behavior of Fe2Nb Laves phase on grain boundaries in austenitic heat resistant steels

Cited by 62 publications

References 11 publications

Precipitation Processes in Creep-Resistant Austenitic Steels

Precipitation Processes in Creep-Resistant Austenitic Steels

The effect of aging on the microstructure and mechanical behavior of the alumina-forming austenitic stainless steel Fe–20Cr–30Ni–2Nb–5Al

Investigation of microstructure and liquid lead corrosion behavior of a Fe-18Ni-16Cr-4Al base alumina-forming austenitic stainless steel

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