The role of grain boundary orientation and secondary phases in creep cavity nucleation of a 316h boiler header

Tomas L. Martin; Siqi He; Alexander D. Warren; Hao Shang; David M. Knowles; Peter E.J. Flewitt

doi:10.1115/PVP2020-21791

The role of grain boundary orientation and secondary phases in creep cavity nucleation of a 316h boiler header

Tomas L. Martin, Siqi He, Alexander D. Warren, Hao Shang, David M. Knowles, Peter E.J. Flewitt

Research output: Chapter in Book/Report/Conference proceeding › Conference Contribution (Conference Proceeding)

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Abstract

Cavity formation during creep of steels at high temperatures and stresses is closely related to the original and evolved microstructure, particularly the orientation between grains and precipitation at the grain boundaries. Understanding the initiation, growth and coalescence of creep cavities is critical to determining the operational life of components in high temperature, high stress environments such as an advanced gas-cooled nuclear reactor. However, accelerated laboratory-based testing frequently shows another kind of void within the microstructure, caused by plastic damage and ductile failure, particularly if a specimen fails during a test. This paper compares the type of voids and cavities observed in an AISI 316 stainless steel after extensive service in a gas-cooled nuclear reactor boiler header and after uniaxial creep testing of a similar material at higher stresses. The differences between the features observed and their potential mechanistic origins are discussed.

Original language	English
Title of host publication	Proceedings of the ASME 2020 Pressure Vessels & Piping Conference
Subtitle of host publication	Vol 6: Materials and Fabrication
Publisher	American Society of Mechanical Engineers (ASME)
Number of pages	7
Volume	6
ISBN (Electronic)	978-0-7918-8386-0
DOIs	https://doi.org/10.1115/PVP2020-21791
Publication status	E-pub ahead of print - 28 Oct 2020
Event	ASME 2020 Pressure Vessels and Piping Conference, PVP 2020 - Virtual, Online Duration: 3 Aug 2020 → …

Publication series

Name	Proceedings of the Pressure Vessels and Piping (PVP) Conference
Publisher	American Society of Mechanical Engineers,
Volume	6
ISSN (Print)	0277-027X

Conference

Conference	ASME 2020 Pressure Vessels and Piping Conference, PVP 2020
City	Virtual, Online
Period	3/08/20 → …

Bibliographical note

Funding Information:
Dr Mike Spindler and EDF Energy are thanked for providing the 316H material and performing the strain-controlled creep test (specimen 2). Edward Hares and Mahmoud Mostafavi are thanked for performing the creep relaxation test for specimen 3. This work was supported by the EDF High Temperature Centre and ESPRC grant EP/R026076/1.

Publisher Copyright:
© 2020 ASME

Keywords

Cavitation
Creep
Plastic deformation
Voids

Access to Document

10.1115/PVP2020-21791

Full-text PDF (final published version)
This is the author accepted manuscript (AAM). The final published version (version of record) is available online via The American Society of Mechanical Engineers at https://doi.org/10.1115/PVP2020-21791 . Please refer to any applicable terms of use of the publisher.
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Martin, T. L., He, S., Warren, A. D., Shang, H., Knowles, D. M., & Flewitt, P. E. J. (2020). The role of grain boundary orientation and secondary phases in creep cavity nucleation of a 316h boiler header. In Proceedings of the ASME 2020 Pressure Vessels & Piping Conference: Vol 6: Materials and Fabrication (Vol. 6). Article v006t06a043 (Proceedings of the Pressure Vessels and Piping (PVP) Conference; Vol. 6). American Society of Mechanical Engineers (ASME). Advance online publication. https://doi.org/10.1115/PVP2020-21791

Martin, Tomas L. ; He, Siqi ; Warren, Alexander D. et al. / The role of grain boundary orientation and secondary phases in creep cavity nucleation of a 316h boiler header. Proceedings of the ASME 2020 Pressure Vessels & Piping Conference: Vol 6: Materials and Fabrication. Vol. 6 American Society of Mechanical Engineers (ASME), 2020. (Proceedings of the Pressure Vessels and Piping (PVP) Conference).

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abstract = "Cavity formation during creep of steels at high temperatures and stresses is closely related to the original and evolved microstructure, particularly the orientation between grains and precipitation at the grain boundaries. Understanding the initiation, growth and coalescence of creep cavities is critical to determining the operational life of components in high temperature, high stress environments such as an advanced gas-cooled nuclear reactor. However, accelerated laboratory-based testing frequently shows another kind of void within the microstructure, caused by plastic damage and ductile failure, particularly if a specimen fails during a test. This paper compares the type of voids and cavities observed in an AISI 316 stainless steel after extensive service in a gas-cooled nuclear reactor boiler header and after uniaxial creep testing of a similar material at higher stresses. The differences between the features observed and their potential mechanistic origins are discussed.",

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note = "Funding Information: Dr Mike Spindler and EDF Energy are thanked for providing the 316H material and performing the strain-controlled creep test (specimen 2). Edward Hares and Mahmoud Mostafavi are thanked for performing the creep relaxation test for specimen 3. This work was supported by the EDF High Temperature Centre and ESPRC grant EP/R026076/1. Publisher Copyright: {\textcopyright} 2020 ASME; ASME 2020 Pressure Vessels and Piping Conference, PVP 2020 ; Conference date: 03-08-2020",

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Martin, TL, He, S, Warren, AD, Shang, H, Knowles, DM & Flewitt, PEJ 2020, The role of grain boundary orientation and secondary phases in creep cavity nucleation of a 316h boiler header. in Proceedings of the ASME 2020 Pressure Vessels & Piping Conference: Vol 6: Materials and Fabrication. vol. 6, v006t06a043, Proceedings of the Pressure Vessels and Piping (PVP) Conference, vol. 6, American Society of Mechanical Engineers (ASME), ASME 2020 Pressure Vessels and Piping Conference, PVP 2020, Virtual, Online, 3/08/20. https://doi.org/10.1115/PVP2020-21791

The role of grain boundary orientation and secondary phases in creep cavity nucleation of a 316h boiler header. / Martin, Tomas L.; He, Siqi; Warren, Alexander D. et al.
Proceedings of the ASME 2020 Pressure Vessels & Piping Conference: Vol 6: Materials and Fabrication. Vol. 6 American Society of Mechanical Engineers (ASME), 2020. v006t06a043 (Proceedings of the Pressure Vessels and Piping (PVP) Conference; Vol. 6).

Research output: Chapter in Book/Report/Conference proceeding › Conference Contribution (Conference Proceeding)

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AU - Shang, Hao

AU - Knowles, David M.

AU - Flewitt, Peter E.J.

N1 - Funding Information: Dr Mike Spindler and EDF Energy are thanked for providing the 316H material and performing the strain-controlled creep test (specimen 2). Edward Hares and Mahmoud Mostafavi are thanked for performing the creep relaxation test for specimen 3. This work was supported by the EDF High Temperature Centre and ESPRC grant EP/R026076/1. Publisher Copyright: © 2020 ASME

PY - 2020/10/28

Y1 - 2020/10/28

N2 - Cavity formation during creep of steels at high temperatures and stresses is closely related to the original and evolved microstructure, particularly the orientation between grains and precipitation at the grain boundaries. Understanding the initiation, growth and coalescence of creep cavities is critical to determining the operational life of components in high temperature, high stress environments such as an advanced gas-cooled nuclear reactor. However, accelerated laboratory-based testing frequently shows another kind of void within the microstructure, caused by plastic damage and ductile failure, particularly if a specimen fails during a test. This paper compares the type of voids and cavities observed in an AISI 316 stainless steel after extensive service in a gas-cooled nuclear reactor boiler header and after uniaxial creep testing of a similar material at higher stresses. The differences between the features observed and their potential mechanistic origins are discussed.

AB - Cavity formation during creep of steels at high temperatures and stresses is closely related to the original and evolved microstructure, particularly the orientation between grains and precipitation at the grain boundaries. Understanding the initiation, growth and coalescence of creep cavities is critical to determining the operational life of components in high temperature, high stress environments such as an advanced gas-cooled nuclear reactor. However, accelerated laboratory-based testing frequently shows another kind of void within the microstructure, caused by plastic damage and ductile failure, particularly if a specimen fails during a test. This paper compares the type of voids and cavities observed in an AISI 316 stainless steel after extensive service in a gas-cooled nuclear reactor boiler header and after uniaxial creep testing of a similar material at higher stresses. The differences between the features observed and their potential mechanistic origins are discussed.

KW - Cavitation

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VL - 6

T3 - Proceedings of the Pressure Vessels and Piping (PVP) Conference

BT - Proceedings of the ASME 2020 Pressure Vessels & Piping Conference

PB - American Society of Mechanical Engineers (ASME)

T2 - ASME 2020 Pressure Vessels and Piping Conference, PVP 2020

Y2 - 3 August 2020

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Martin TL, He S, Warren AD, Shang H, Knowles DM, Flewitt PEJ. The role of grain boundary orientation and secondary phases in creep cavity nucleation of a 316h boiler header. In Proceedings of the ASME 2020 Pressure Vessels & Piping Conference: Vol 6: Materials and Fabrication. Vol. 6. American Society of Mechanical Engineers (ASME). 2020. v006t06a043. (Proceedings of the Pressure Vessels and Piping (PVP) Conference). Epub 2020 Oct 28. doi: 10.1115/PVP2020-21791

The role of grain boundary orientation and secondary phases in creep cavity nucleation of a 316h boiler header

Abstract

Publication series

Conference

Bibliographical note

Keywords

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Rework of EPSRC: The Physics of Cavity Nucleation and Healing: An Experimental and Modelling Approach

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The role of grain boundary orientation and secondary phases in creep cavity nucleation of a 316h boiler header

Abstract

Publication series

Conference

Bibliographical note

Keywords

Access to Document

Handle.net

Other files and links

Fingerprint

Projects

Rework of EPSRC: The Physics of Cavity Nucleation and Healing: An Experimental and Modelling Approach

Cite this