Precipitated phases in the ferrite of aged cast duplex stainless steels

Vrinat, M.; Cozar, R.; Meyzaud, Y.

doi:10.1016/0036-9748(86)90183-3

Cited by 54 publications

(22 citation statements)

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“…Particles were found to be a few nanometers in diameter and to precipitate preferentially on dislocations, and sometimes also homogeneously in the ferritic phase. Since, other workers corroborated this result for other duplex stainless steel grades [3][4][5][6]. It nevertheless appears that G-phase was observed for the first time in ferritic steels by ALLSOP and BROWN in 1960, even if not identified as "G" but as "S"-phase [7].…”

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confidence: 70%

“…In addition, literature data on the actual composition of these particles, as well as on their number density and volume fraction, exhibit a very large scatter (see for example [2][3][4][5][6][7]9] [5]. For samples aged 30 000 hours at 400 ° C, which are going to be analyzed in this paper, they revealed extensive spinodal decomposition of the ironchromium solid solution and a large amount of G-phase precipitates.…”

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confidence: 97%

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A 3D study of G-phase precipitation in spinodally decomposed α-ferrite by tomographic atom-probe analysis

Danoix¹,

Auger²,

Chambreland³

et al. 1994

Microsc. Microanal. Microstruct.

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Abstract. 2014 The capabilities of the newly developed Tomographic Atom-Probe have been used to study G-phase precipitates in the ferritic phase of duplex stainless steels aged 30 000 hours at 400 °C. It is shown, on three dimensional reconstructions in real space, that G-phase particles form at the interface between the domains produced by the Fe-Cr spinodal decomposition, namely 03B1 (Fe-rich) and 03B1' (Cr-rich). Furthermore, thanks to the instrument very high spatial resolution, the complex internal morphology of these particles can be studied, in particular the partitioning of the various chemical species.

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confidence: 70%

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confidence: 97%

A 3D study of G-phase precipitation in spinodally decomposed α-ferrite by tomographic atom-probe analysis

Danoix¹,

Auger²,

Chambreland³

et al. 1994

Microsc. Microanal. Microstruct.

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“…One of the less encountered precipitates is G phase, a silicon containing FCC intermetallic phase (a = 1.115-1.120 nm [12]) with a nominal composition observed in austenitic stainless steels [12][13][14][15][16][17][18][19][20] of (Ni/Fe/Cr) 16 (Nb/ Ti) 6 Si 6 [12]. By comparison, in duplex stainless steels [12,21,22] the composition is (Fe/Ni) 16 (Mn/Cr) 6 Si 7 [19]. Other studies have found that substitution of Mo for Ni is possible [14,23].…”

Section: Introductionmentioning

confidence: 99%

“…Other studies have found that substitution of Mo for Ni is possible [14,23]. G phase precipitates form within the ferrite regions of duplex [21,22] and nominally austenitic stainless steels (e.g. Type 300 series austenitic steels) [13,15,16,19] during ageing within the temperature range of 250-500°C [12,14,22].…”

Section: Introductionmentioning

confidence: 99%

“…G phase precipitates form within the ferrite regions of duplex [21,22] and nominally austenitic stainless steels (e.g. Type 300 series austenitic steels) [13,15,16,19] during ageing within the temperature range of 250-500°C [12,14,22]. This phase typically nucleates and grows at austenite grain boundaries [21,24], and/or at austenite-a-ferrite phase boundaries but in the latter case it has a cube-on-cube orientation relationship with the ferrite [19,21].…”

Section: Introductionmentioning

confidence: 99%

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Precipitation within localised chromium-enriched regions in a Type 316H austenitic stainless steel

2018

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A Type 316H austenitic stainless steel component containing Cr and impurity element-rich localised regions arising from component fabrication was aged for a prolonged period during service at a temperature of approximately 550°C. These regions make up approximately 5% of the total volume of the microstructure. Previous work has shown that these regions contain ferrite and carbide precipitates and a finer austenite grain size than the adjacent matrix. The present study has used high-resolution transmission electron microscopy combined with compositional microanalysis to show that these regions have a highly complex microstructure containing G phase, chi phase and intragranular c 0 precipitates within the austenite grains. There is phosphorus migration to the chi austenite phase boundary, and the basis for this equilibrium impurity segregation is discussed. A Cr-depleted region was observed surrounding the chi phase precipitates, and the impact of this on the other precipitates is considered. The diversity of precipitates in these Cr-rich regions means that they behave significantly differently to the bulk material under long-term creep conditions leading to preferred nucleation and growth of creep cavities and the formation of localised creep cracks during service.

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Characterization of Duplex Stainless Steels by TEM, SANS, and APFIM Techniques

Chung

Chopra

1990

Characterization of Advanced Materials

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Precipitated phases in the ferrite of aged cast duplex stainless steels

Cited by 54 publications

References 1 publication

A 3D study of G-phase precipitation in spinodally decomposed α-ferrite by tomographic atom-probe analysis

A 3D study of G-phase precipitation in spinodally decomposed α-ferrite by tomographic atom-probe analysis

Precipitation within localised chromium-enriched regions in a Type 316H austenitic stainless steel

Characterization of Duplex Stainless Steels by TEM, SANS, and APFIM Techniques

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