The influence of stress on the oxidation of a ni-based superalloy

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The influence of stress on the oxidation of a ni-based superalloy. / Taylor, Mary; Evans, Hugh; Ramsay, Joshua; Child, Danial; Hardy, Mark.

In: Corrosion Science, Vol. 154, 01.07.2019, p. 277-285.

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Taylor, Mary ; Evans, Hugh ; Ramsay, Joshua ; Child, Danial ; Hardy, Mark. / The influence of stress on the oxidation of a ni-based superalloy. In: Corrosion Science. 2019 ; Vol. 154. pp. 277-285.

Bibtex

@article{e24cdafc3fe24009af253c5e256a4f25,
title = "The influence of stress on the oxidation of a ni-based superalloy",
abstract = "Double edge notched specimens of the Ni-based superalloy RR1000 have been subjected to 1-1-1-1 fatigue tests with R = 0 at 750 °C in air for 111 h at a peak elastic stress of 900 MPa. Extensive measurements of the thickness of the chromia layer formed during this exposure period show no influence of the applied stress. In contrast, the depth of the intergranular alumina penetrations underlying the chromia layer were approximately a factor of 2 larger in the most stressed regions (base of the notches)than in unstressed regions adjacent to the notches. This difference was highly significant and is considered to demonstrate Stress Aided Grain Boundary Oxidation (SAGBO). A model for this process has been developed in which the tensile stress at the tip of the alumina intrusion increased the anion vacancy concentration there and the vacancy flux along the intrusion. A consequence was that the intrusion growth rate increased above that in the absence of stress. The observed increase of a factor of 2 in intrusion length is estimated to be achievable at a tensile stress of ˜1 GPa within the intrusion at its tip. This is considered to be plausible in such a high-strength alloy.",
keywords = "Alumina, Fatigue, Ni-based superalloys, Oxidation, Stress-aided grain boundary oxidation (SAGBO)",
author = "Mary Taylor and Hugh Evans and Joshua Ramsay and Danial Child and Mark Hardy",
year = "2019",
month = jul,
day = "1",
doi = "10.1016/j.corsci.2019.04.023",
language = "English",
volume = "154",
pages = "277--285",
journal = "Corrosion Science",
issn = "0010-938X",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - The influence of stress on the oxidation of a ni-based superalloy

AU - Taylor, Mary

AU - Evans, Hugh

AU - Ramsay, Joshua

AU - Child, Danial

AU - Hardy, Mark

PY - 2019/7/1

Y1 - 2019/7/1

N2 - Double edge notched specimens of the Ni-based superalloy RR1000 have been subjected to 1-1-1-1 fatigue tests with R = 0 at 750 °C in air for 111 h at a peak elastic stress of 900 MPa. Extensive measurements of the thickness of the chromia layer formed during this exposure period show no influence of the applied stress. In contrast, the depth of the intergranular alumina penetrations underlying the chromia layer were approximately a factor of 2 larger in the most stressed regions (base of the notches)than in unstressed regions adjacent to the notches. This difference was highly significant and is considered to demonstrate Stress Aided Grain Boundary Oxidation (SAGBO). A model for this process has been developed in which the tensile stress at the tip of the alumina intrusion increased the anion vacancy concentration there and the vacancy flux along the intrusion. A consequence was that the intrusion growth rate increased above that in the absence of stress. The observed increase of a factor of 2 in intrusion length is estimated to be achievable at a tensile stress of ˜1 GPa within the intrusion at its tip. This is considered to be plausible in such a high-strength alloy.

AB - Double edge notched specimens of the Ni-based superalloy RR1000 have been subjected to 1-1-1-1 fatigue tests with R = 0 at 750 °C in air for 111 h at a peak elastic stress of 900 MPa. Extensive measurements of the thickness of the chromia layer formed during this exposure period show no influence of the applied stress. In contrast, the depth of the intergranular alumina penetrations underlying the chromia layer were approximately a factor of 2 larger in the most stressed regions (base of the notches)than in unstressed regions adjacent to the notches. This difference was highly significant and is considered to demonstrate Stress Aided Grain Boundary Oxidation (SAGBO). A model for this process has been developed in which the tensile stress at the tip of the alumina intrusion increased the anion vacancy concentration there and the vacancy flux along the intrusion. A consequence was that the intrusion growth rate increased above that in the absence of stress. The observed increase of a factor of 2 in intrusion length is estimated to be achievable at a tensile stress of ˜1 GPa within the intrusion at its tip. This is considered to be plausible in such a high-strength alloy.

KW - Alumina

KW - Fatigue

KW - Ni-based superalloys

KW - Oxidation

KW - Stress-aided grain boundary oxidation (SAGBO)

UR - http://www.scopus.com/inward/record.url?scp=85064756966&partnerID=8YFLogxK

U2 - 10.1016/j.corsci.2019.04.023

DO - 10.1016/j.corsci.2019.04.023

M3 - Article

VL - 154

SP - 277

EP - 285

JO - Corrosion Science

JF - Corrosion Science

SN - 0010-938X

ER -