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Effect of elastic follow-up and ageing on the creep of an austenitic stainless steel

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Effect of elastic follow-up and ageing on the creep of an austenitic stainless steel. / Wang, Y. Q.; Coules, H. E.; Truman, C. E.; Smith, D. J.

In: International Journal of Solids and Structures, Vol. 135, 15.03.2018, p. 219-232.

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Wang, Y. Q. ; Coules, H. E. ; Truman, C. E. ; Smith, D. J. / Effect of elastic follow-up and ageing on the creep of an austenitic stainless steel. In: International Journal of Solids and Structures. 2018 ; Vol. 135. pp. 219-232.

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@article{e616523de1594f2a9624801e72740f92,
title = "Effect of elastic follow-up and ageing on the creep of an austenitic stainless steel",
abstract = "Elastic follow-up is a mechanical boundary condition lying between constant load and constant strain control. It exists in many engineering components operating at high temperature and can result in dramatically different creep stress relaxation and strain accumulation rates in a localized region of a component. We have performed creep tests under constant load, constant strain and elastic follow-up control on an aged (additional 22,000 h) 316H austenitic stainless steel after service in a nuclear power station for 65,000 h. Primary and secondary forward creep models with parameters derived from the constant-load data were able to describe constant-load creep adequately, but not able to predict stress relaxation and elastic follow-up. We show that this is because ageing has increased the constant-load creep strain rate significantly but has no effect on stress relaxation creep strain rate. Ageing promotes the formation of ferrite/chi phase at grain boundaries which are preferential sites for creep cavitation under load control. However, creep cavitation is less likely under constant strain and elastic follow-up control because a high creep strain rate, large creep strain and stress cannot coexist under these boundary conditions.",
keywords = "Ageing, Austenitic stainless steel, Constitutive equations, Creep stress relaxation, Elastic follow-up",
author = "Wang, {Y. Q.} and Coules, {H. E.} and Truman, {C. E.} and Smith, {D. J.}",
year = "2018",
month = "3",
day = "15",
doi = "10.1016/j.ijsolstr.2017.11.022",
language = "English",
volume = "135",
pages = "219--232",
journal = "International Journal of Solids and Structures",
issn = "0020-7683",
publisher = "Pergamon Press",

}

RIS - suitable for import to EndNote

TY - JOUR

T1 - Effect of elastic follow-up and ageing on the creep of an austenitic stainless steel

AU - Wang, Y. Q.

AU - Coules, H. E.

AU - Truman, C. E.

AU - Smith, D. J.

PY - 2018/3/15

Y1 - 2018/3/15

N2 - Elastic follow-up is a mechanical boundary condition lying between constant load and constant strain control. It exists in many engineering components operating at high temperature and can result in dramatically different creep stress relaxation and strain accumulation rates in a localized region of a component. We have performed creep tests under constant load, constant strain and elastic follow-up control on an aged (additional 22,000 h) 316H austenitic stainless steel after service in a nuclear power station for 65,000 h. Primary and secondary forward creep models with parameters derived from the constant-load data were able to describe constant-load creep adequately, but not able to predict stress relaxation and elastic follow-up. We show that this is because ageing has increased the constant-load creep strain rate significantly but has no effect on stress relaxation creep strain rate. Ageing promotes the formation of ferrite/chi phase at grain boundaries which are preferential sites for creep cavitation under load control. However, creep cavitation is less likely under constant strain and elastic follow-up control because a high creep strain rate, large creep strain and stress cannot coexist under these boundary conditions.

AB - Elastic follow-up is a mechanical boundary condition lying between constant load and constant strain control. It exists in many engineering components operating at high temperature and can result in dramatically different creep stress relaxation and strain accumulation rates in a localized region of a component. We have performed creep tests under constant load, constant strain and elastic follow-up control on an aged (additional 22,000 h) 316H austenitic stainless steel after service in a nuclear power station for 65,000 h. Primary and secondary forward creep models with parameters derived from the constant-load data were able to describe constant-load creep adequately, but not able to predict stress relaxation and elastic follow-up. We show that this is because ageing has increased the constant-load creep strain rate significantly but has no effect on stress relaxation creep strain rate. Ageing promotes the formation of ferrite/chi phase at grain boundaries which are preferential sites for creep cavitation under load control. However, creep cavitation is less likely under constant strain and elastic follow-up control because a high creep strain rate, large creep strain and stress cannot coexist under these boundary conditions.

KW - Ageing

KW - Austenitic stainless steel

KW - Constitutive equations

KW - Creep stress relaxation

KW - Elastic follow-up

UR - http://www.scopus.com/inward/record.url?scp=85042918615&partnerID=8YFLogxK

U2 - 10.1016/j.ijsolstr.2017.11.022

DO - 10.1016/j.ijsolstr.2017.11.022

M3 - Article

VL - 135

SP - 219

EP - 232

JO - International Journal of Solids and Structures

JF - International Journal of Solids and Structures

SN - 0020-7683

ER -