Anelasticity in austenitic stainless steel

P. Ashwin Rao; John Bouchard; Shirley M. Northover; Michael E. Fitzpatrick

doi:10.1016/j.actamat.2012.08.060

Anelasticity in austenitic stainless steel

P. Ashwin Rao, John Bouchard, Shirley M. Northover, Michael E. Fitzpatrick

College of Engineering, Environment & Science

Research output: Contribution to journal › Article › peer-review

29 Citations (Scopus)

Abstract

Time-dependent anelastic deformation mechanisms arise in austenitic stainless steel when load is removed during a high-temperature creep test. This phenomenon is investigated by conducting creep tests, with intermittent load removal, on AISI Type 316H austenitic stainless steel at 550 and 650 °C, supported by in situ measurement of creep-induced intergranular residual strains by neutron diffraction. All the cyclic tests exhibit anelastic behaviour on unloading and develop substantially lower load-on creep strain rates, reduced ductility and longer rupture times than baseline steady-load creep tests at similar conditions. The mechanisms underlying the observed anelastic behaviour and changes in macroscopic creep properties are discussed with reference to the development of intergranular strains and dislocation behaviour.

Original language	English
Pages (from-to)	6851–6861
Journal	Acta Materialia
Volume	60
Issue number	19
DOIs	https://doi.org/10.1016/j.actamat.2012.08.060
Publication status	Published - Nov 2012

Bibliographical note

This paper is not available on the repository

Keywords

Creep test
Neutron diffraction
Transmission electron microscopy (TEM)
Austenitic steels

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10.1016/j.actamat.2012.08.060

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title = "Anelasticity in austenitic stainless steel",

abstract = "Time-dependent anelastic deformation mechanisms arise in austenitic stainless steel when load is removed during a high-temperature creep test. This phenomenon is investigated by conducting creep tests, with intermittent load removal, on AISI Type 316H austenitic stainless steel at 550 and 650 °C, supported by in situ measurement of creep-induced intergranular residual strains by neutron diffraction. All the cyclic tests exhibit anelastic behaviour on unloading and develop substantially lower load-on creep strain rates, reduced ductility and longer rupture times than baseline steady-load creep tests at similar conditions. The mechanisms underlying the observed anelastic behaviour and changes in macroscopic creep properties are discussed with reference to the development of intergranular strains and dislocation behaviour.",

keywords = "Creep test, Neutron diffraction, Transmission electron microscopy (TEM), Austenitic steels",

author = "{Ashwin Rao}, P. and John Bouchard and Northover, {Shirley M.} and Fitzpatrick, {Michael E.}",

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T1 - Anelasticity in austenitic stainless steel

AU - Ashwin Rao, P.

AU - Bouchard, John

AU - Northover, Shirley M.

AU - Fitzpatrick, Michael E.

N1 - This paper is not available on the repository

PY - 2012/11

Y1 - 2012/11

N2 - Time-dependent anelastic deformation mechanisms arise in austenitic stainless steel when load is removed during a high-temperature creep test. This phenomenon is investigated by conducting creep tests, with intermittent load removal, on AISI Type 316H austenitic stainless steel at 550 and 650 °C, supported by in situ measurement of creep-induced intergranular residual strains by neutron diffraction. All the cyclic tests exhibit anelastic behaviour on unloading and develop substantially lower load-on creep strain rates, reduced ductility and longer rupture times than baseline steady-load creep tests at similar conditions. The mechanisms underlying the observed anelastic behaviour and changes in macroscopic creep properties are discussed with reference to the development of intergranular strains and dislocation behaviour.

AB - Time-dependent anelastic deformation mechanisms arise in austenitic stainless steel when load is removed during a high-temperature creep test. This phenomenon is investigated by conducting creep tests, with intermittent load removal, on AISI Type 316H austenitic stainless steel at 550 and 650 °C, supported by in situ measurement of creep-induced intergranular residual strains by neutron diffraction. All the cyclic tests exhibit anelastic behaviour on unloading and develop substantially lower load-on creep strain rates, reduced ductility and longer rupture times than baseline steady-load creep tests at similar conditions. The mechanisms underlying the observed anelastic behaviour and changes in macroscopic creep properties are discussed with reference to the development of intergranular strains and dislocation behaviour.

KW - Creep test

KW - Neutron diffraction

KW - Transmission electron microscopy (TEM)

KW - Austenitic steels

U2 - 10.1016/j.actamat.2012.08.060

DO - 10.1016/j.actamat.2012.08.060

M3 - Article

SN - 1873-2453

VL - 60

SP - 6851

EP - 6861

JO - Acta Materialia

JF - Acta Materialia

IS - 19

ER -

Anelasticity in austenitic stainless steel

Abstract

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Keywords

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