Radiation instability of equal channel angular extruded T91 at ultra-high damage levels

Gigax, Jonathan G.; Kim, Hyosim; Chen, Tianyi; Garner, F. A.; Shao, Lin

doi:10.1016/j.actamat.2017.04.038

Title: Radiation instability of equal channel angular extruded T91 at ultra-high damage levels

Abstract

Although several studies have shown that nano-grained alloys have higher radiation resistance than coarse-grained variants, with dense grain boundary structures acting as defect sinks to remove damage, the present study shows the failure of severe deformation to suppress void swelling in T91 alloy at ultra-high damage levels. Fe self-ion irradiation up to 1000 peak dpa produced significantly more swelling in extruded T91 than conventional T91 at 475 °C. Dramatic radiation-enhanced grain growth was observed in the extruded T91, manifested in two rapid grain growth stages. One stage occurs at a relatively low damage level, and the other at a higher damage level beyond 750 peak dpa. The second rapid growth stage is correlated with void swelling and starts at the end of the swelling incubation period. The study suggests that the defect sink properties of the growing grain boundaries under a coarsening process are different from that of stable boundary configurations. When void swelling becomes significant and voids act as a biased sink for vacancies, the growing grain boundaries act as a biased sink for interstitials, leading to rapid growth at higher damage levels.

Authors:

Gigax, Jonathan G. ^[1]; Kim, Hyosim ^[1]; Chen, Tianyi ^[1]; Garner, F. A. ^[2];

^[1]

Texas A & M Univ., College Station, TX (United States)
Texas A & M Univ., College Station, TX (United States); Radiation Effects Consulting, Richland, WA (United States)

Publication Date:: Tue Apr 18 00:00:00 EDT 2017

Research Org.:: Texas A & M Univ., College Station, TX (United States). Texas A & M Engineering Experiment Station

Sponsoring Org.:: USDOE Office of Nuclear Energy (NE)

OSTI Identifier:: 1533475

Alternate Identifier(s):: OSTI ID: 1550497

Grant/Contract Number:: NE0008297

Resource Type:: Accepted Manuscript

Journal Name:: Acta Materialia

Additional Journal Information:: Journal Volume: 132; Journal Issue: C; Journal ID: ISSN 1359-6454

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; Materials Science; Metallurgy & Metallurgical Engineering; Ion irradiation; Equal channel angular extrusion; High dpa; Grain coarsening

Citation Formats


                    Gigax, Jonathan G., Kim, Hyosim, Chen, Tianyi, Garner, F. A., and Shao, Lin. Radiation instability of equal channel angular extruded T91 at ultra-high damage levels.  United States: N. p., 2017. 
Web.  doi:10.1016/j.actamat.2017.04.038.

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                    Gigax, Jonathan G., Kim, Hyosim, Chen, Tianyi, Garner, F. A., & Shao, Lin. Radiation instability of equal channel angular extruded T91 at ultra-high damage levels.  United States.  https://doi.org/10.1016/j.actamat.2017.04.038

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                    Gigax, Jonathan G., Kim, Hyosim, Chen, Tianyi, Garner, F. A., and Shao, Lin. Tue .  
"Radiation instability of equal channel angular extruded T91 at ultra-high damage levels".  United States.  https://doi.org/10.1016/j.actamat.2017.04.038.  https://www.osti.gov/servlets/purl/1533475.

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@article{osti_1533475,

  title        = {Radiation instability of equal channel angular extruded T91 at ultra-high damage levels},

  author       = {Gigax, Jonathan G. and Kim, Hyosim and Chen, Tianyi and Garner, F. A. and Shao, Lin},

  abstractNote = {Although several studies have shown that nano-grained alloys have higher radiation resistance than coarse-grained variants, with dense grain boundary structures acting as defect sinks to remove damage, the present study shows the failure of severe deformation to suppress void swelling in T91 alloy at ultra-high damage levels. Fe self-ion irradiation up to 1000 peak dpa produced significantly more swelling in extruded T91 than conventional T91 at 475 °C. Dramatic radiation-enhanced grain growth was observed in the extruded T91, manifested in two rapid grain growth stages. One stage occurs at a relatively low damage level, and the other at a higher damage level beyond 750 peak dpa. The second rapid growth stage is correlated with void swelling and starts at the end of the swelling incubation period. The study suggests that the defect sink properties of the growing grain boundaries under a coarsening process are different from that of stable boundary configurations. When void swelling becomes significant and voids act as a biased sink for vacancies, the growing grain boundaries act as a biased sink for interstitials, leading to rapid growth at higher damage levels.},

  doi          = {10.1016/j.actamat.2017.04.038},

  journal      = {Acta Materialia},

  number       = C,

  volume       = 132,

  place        = {United States},

  year         = {Tue Apr 18 00:00:00 EDT 2017},

  month        = {Tue Apr 18 00:00:00 EDT 2017}

}

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Title: Radiation instability of equal channel angular extruded T91 at ultra-high damage levels

Abstract

Citation Formats

Microstructural development in reduced activation ferritic alloys irradiated to 200 dpa at 420°C journal, September 1994

Length-scale Effects in Cascade Damage Production in Iron journal, January 2008

Effect of grain boundary character on sink efficiency journal, October 2012

Prediction of swelling of 18Cr10NiTi austenitic steel over a wide range of displacement rates journal, April 2010

Compositional and temperature dependence of void swelling in model Fe–Cr base alloys irradiated in the EBR-II fast reactor journal, December 2000

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Probing grain boundary sink strength at the nanoscale: Energetics and length scales of vacancy and interstitial absorption by grain boundaries in α -Fe journal, February 2012

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Efficient Annealing of Radiation Damage Near Grain Boundaries via Interstitial Emission journal, March 2010

Response of equal channel angular extrusion processed ultrafine-grained T91 steel subjected to high temperature heavy ion irradiation journal, August 2014

Recent insights on the swelling and creep of irradiated austenitic alloys journal, May 1984

Void-swelling in irons and ferritic steels journal, November 1979

Dislocation Models of Crystal Grain Boundaries journal, May 1950

Very high swelling and embrittlement observed in a Fe–18Cr–10Ni–Ti hexagonal fuel wrapper irradiated in the BOR-60 fast reactor journal, September 2008

Void-swelling in irons and ferritic steels journal, November 1979

Bulk nanostructured materials from severe plastic deformation journal, March 2000

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The relationship between grain boundary structure, defect mobility and grain boundary sink efficiency journal, March 2015

The microstructure and tensile properties of Fe–Cr alloys after neutron irradiation at 400°C to 5.5–7.1 dpa journal, August 1998

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Factors which control the swelling of FeCrNi ternary austenitic alloys journal, June 1997

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The process of grain refinement in equal-channel angular pressing journal, May 1998

Point defect annihilation at grain boundaries in gold journal, April 1985

Microstructural analysis of neutron-irradiated martensitic steels journal, June 1996

Irradiation-induced grain growth in nanocrystalline reduced activation ferrite/martensite steel journal, September 2014

Microstructural evolution and radiation stability of steels and alloys journal, May 1999

Microstructure of 9 Cr-1 MoVNb steel irradiated to 36 dpa at elevated temperatures in HFIR journal, May 1984

Grain refinement of T91 alloy by equal channel angular pressing journal, May 2009

Effect of self-ion irradiation on the microstructural changes of alloy EK-181 in annealed and severely deformed conditions journal, April 2017

Grain boundaries in ultrafine grained materials processed by severe plastic deformation and related phenomena journal, April 2012

Microstructural development in reduced activation ferritic alloys irradiated to 200 dpa at 420°C
journal, September 1994

Length-scale Effects in Cascade Damage Production in Iron
journal, January 2008

Effect of grain boundary character on sink efficiency
journal, October 2012

Prediction of swelling of 18Cr10NiTi austenitic steel over a wide range of displacement rates
journal, April 2010

Compositional and temperature dependence of void swelling in model Fe–Cr base alloys irradiated in the EBR-II fast reactor
journal, December 2000

Theory and experimental background on dimensional changes in irradiated alloys
journal, October 1994

Probing grain boundary sink strength at the nanoscale: Energetics and length scales of vacancy and interstitial absorption by grain boundaries in $α$ -Fe
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Irradiation creep and swelling of the US fusion heats of HT9 and 9Cr-1Mo to 208 dpa at ~ 400°C
journal, September 1994

Efficient Annealing of Radiation Damage Near Grain Boundaries via Interstitial Emission
journal, March 2010

Response of equal channel angular extrusion processed ultrafine-grained T91 steel subjected to high temperature heavy ion irradiation
journal, August 2014

Recent insights on the swelling and creep of irradiated austenitic alloys
journal, May 1984

Void-swelling in irons and ferritic steels
journal, November 1979

Dislocation Models of Crystal Grain Boundaries
journal, May 1950

Very high swelling and embrittlement observed in a Fe–18Cr–10Ni–Ti hexagonal fuel wrapper irradiated in the BOR-60 fast reactor
journal, September 2008

Void-swelling in irons and ferritic steels
journal, November 1979

Bulk nanostructured materials from severe plastic deformation
journal, March 2000

SANS and TEM of ferritic–martensitic steel T91 irradiated in FFTF up to 184dpa at 413°C
journal, September 2013

Nanostructuring of metals by severe plastic deformation for advanced properties
journal, August 2004

Modification of SRIM-calculated dose and injected ion profiles due to sputtering, injected ion buildup and void swelling
journal, November 2016

The relationship between grain boundary structure, defect mobility and grain boundary sink efficiency
journal, March 2015

The microstructure and tensile properties of Fe–Cr alloys after neutron irradiation at 400°C to 5.5–7.1 dpa
journal, August 1998

The Influence of Grain Boundaries on Radiation-Induced Point Defect Production in Materials: A Review of Atomistic Studies
journal, January 2013

Irradiation damage of single crystal, coarse-grained, and nanograined copper under helium bombardment at 450 °C
journal, October 2013

Effect of defect imbalance on void swelling distributions produced in pure iron irradiated with 3.5 MeV self-ions
journal, October 2014

SRIM – The stopping and range of ions in matter (2010)
journal, June 2010

On the use of SRIM for computing radiation damage exposure
journal, September 2013

The influence of ion beam rastering on the swelling of self-ion irradiated pure iron at 450 °C
journal, October 2015

Radiation response of alloy T91 at damage levels up to 1000 peak dpa
journal, December 2016

Swelling and microstructure of pure Fe and Fe–Cr alloys after neutron irradiation to ∼26dpa at 400°C
journal, September 2006

Factors which control the swelling of FeCrNi ternary austenitic alloys
journal, June 1997

Comparison of swelling and irradiation creep behavior of fcc-austenitic and bcc-ferritic/martensitic alloys at high neutron exposure
journal, January 2000

The process of grain refinement in equal-channel angular pressing
journal, May 1998

Point defect annihilation at grain boundaries in gold
journal, April 1985

Microstructural analysis of neutron-irradiated martensitic steels
journal, June 1996

Irradiation-induced grain growth in nanocrystalline reduced activation ferrite/martensite steel
journal, September 2014

Microstructural evolution and radiation stability of steels and alloys
journal, May 1999

Microstructure of 9 Cr-1 MoVNb steel irradiated to 36 dpa at elevated temperatures in HFIR
journal, May 1984

Grain refinement of T91 alloy by equal channel angular pressing
journal, May 2009

Effect of self-ion irradiation on the microstructural changes of alloy EK-181 in annealed and severely deformed conditions
journal, April 2017

Grain boundaries in ultrafine grained materials processed by severe plastic deformation and related phenomena
journal, April 2012