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

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Precipitation within localised chromium-enriched regions in a Type 316H austenitic stainless steel. / Warren, A. D.; Griffiths, I. J.; Flewitt, P. E.J.

In: Journal of Materials Science, Vol. 53, No. 8, 01.04.2018, p. 6183-6197.

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Warren, A. D. ; Griffiths, I. J. ; Flewitt, P. E.J. / Precipitation within localised chromium-enriched regions in a Type 316H austenitic stainless steel. In: Journal of Materials Science. 2018 ; Vol. 53, No. 8. pp. 6183-6197.

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@article{61a9684b84e046109f9e4c4168b297ef,
title = "Precipitation within localised chromium-enriched regions in a Type 316H austenitic stainless steel",
abstract = "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 γ′ 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.",
author = "Warren, {A. D.} and Griffiths, {I. J.} and Flewitt, {P. E.J.}",
year = "2018",
month = "4",
day = "1",
doi = "10.1007/s10853-017-1748-4",
language = "English",
volume = "53",
pages = "6183--6197",
journal = "Journal of Materials Science",
issn = "0022-2461",
publisher = "Springer US",
number = "8",

}

RIS - suitable for import to EndNote

TY - JOUR

T1 - Precipitation within localised chromium-enriched regions in a Type 316H austenitic stainless steel

AU - Warren, A. D.

AU - Griffiths, I. J.

AU - Flewitt, P. E.J.

PY - 2018/4/1

Y1 - 2018/4/1

N2 - 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 γ′ 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.

AB - 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 γ′ 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.

UR - http://www.scopus.com/inward/record.url?scp=85040249657&partnerID=8YFLogxK

U2 - 10.1007/s10853-017-1748-4

DO - 10.1007/s10853-017-1748-4

M3 - Article

VL - 53

SP - 6183

EP - 6197

JO - Journal of Materials Science

T2 - Journal of Materials Science

JF - Journal of Materials Science

SN - 0022-2461

IS - 8

ER -