Atom probe and transmission electron microscopy study of aging of cast duplex stainless steels

Auger, Pierre; Danoix, F.; Menand, A.; Bonnet, Stéphanie; Bourgoin, J.; Guttmann, M.

doi:10.1179/026708390790191116

Cited by 33 publications

(27 citation statements)

References 7 publications

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“…Such a behaviour strongly suggests a two-step evolution of the demixing kinetics. As recently reported [20], the appearance of these high Cr-peaks may be connected with the existence of long-range Cr- [26,27]. Various topologies may also be observed according to the chemical composition or the temperature of ordering.…”

supporting

confidence: 61%

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Fine scale investigation of some phenomena in metallic alloys by field ion microscopy and atom probe microanalysis

Blavette¹,

Auger²

1990

Microsc. Microanal. Microstruct.

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supporting

confidence: 61%

“…FIM images of this steel aged at 400°C for a long time exhibit a duplex contrast which can be attributed to a fine-scale fully interconnected a/a' isotropic sponge-like microstructure [20]. Theses features have already been observed in Fe-Cr, Fe-Cr-Co, Fe-Cr-Ni systems [21,22] and related steels [22,24].…”

mentioning

confidence: 62%

Fine scale investigation of some phenomena in metallic alloys by field ion microscopy and atom probe microanalysis

Blavette¹,

Auger²

1990

Microsc. Microanal. Microstruct.

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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].…”

mentioning

confidence: 71%

“…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.…”

mentioning

confidence: 96%

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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“…The spinodal decomposition of ferrite phase is considered to be the primary cause of the embrittlement during aging at less than 400°C, from a number of investigations for the thermal aging embrittlement of a stainless steel cast. [1][2][3][4] Therefore, as in stainless steel cast, spinodal decomposition of d-ferrite can occur also in austenitic stainless steel welds by thermal aging. However, the investigation about thermal aging embrittlement of austenitic stainless steel welds is very limited.…”

Section: Introductionmentioning

confidence: 99%

Low-Temperature Aging Characteristics of Type 316L Stainless Steel Welds: Dependence on Solidification Mode

Abe

Watanabe

2008

Metall Mater Trans A

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Thermal aging embrittlement of light water reactor (LWR) components made of stainless steel cast has been recognized as a potential degradation issue, and careful attention has been paid to it. Although welds of austenitic stainless steels have c-d duplex microstructure, which is similar to that of the stainless steel cast, examination of the thermal aging characteristics of the stainless steel welds is very limited. In this investigation, two types of type 316L stainless steel weld metal with different solidification modes were prepared using two kinds of filler metals having tailored Ni equivalent and Cr equivalent. Differences between the two weld metals in the morphology of microstructure, in the composition of d-ferrite, and in hardening behaviors with isothermal aging at 335°C have been investigated. The hardness of the ferrite phase has increased with aging time, while the hardness of austenite phase has stayed the same. The mottled aspect has been observed in d-ferrite of aged samples by transmission electron microscopy (TEM) observation. These characteristics suggest that spinodal decomposition has occurred in d-ferrite by aging at 335°C. The age-hardening rate of d-ferrite was faster for the primary austenite solidification mode (AF mode) sample than the primary ferrite solidification mode (FA mode) sample in the initial stage of the aging up to 2000 hours. It has been suggested that the solidification mode can affect the kinetics of spinodal decomposition.

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Atom probe and transmission electron microscopy study of aging of cast duplex stainless steels

Cited by 33 publications

References 7 publications

Fine scale investigation of some phenomena in metallic alloys by field ion microscopy and atom probe microanalysis

Fine scale investigation of some phenomena in metallic alloys by field ion microscopy and atom probe microanalysis

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

Low-Temperature Aging Characteristics of Type 316L Stainless Steel Welds: Dependence on Solidification Mode

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