Experimental evaluation of localized creep deformation in grade 91 steel weldments

Wang, Yiyu; Zhang, Wei; Wang, Yanli; Lim, Yong Chae; Yu, Xinghua; Feng, Zhili

doi:10.1016/j.msea.2020.140356

Title: Experimental evaluation of localized creep deformation in grade 91 steel weldments

Abstract

Spatially resolved measurement of localized creep deformation in heterogeneous creep resistant steel weldments is crucial but challenging for lifetime assessments of critical steam components in power plants. Here, experimental approaches were established to quantitatively evaluate commonly observed localized creep deformation in multi-pass Grade 91 steel weldments. An in-situ digital image correlation (DIC) system was utilized with a creep testing frame to monitor and measure both full-field strain and localized strain accumulation across the weldments during long-term creep testing at elevated temperatures. The in situ DIC method measured not only the creep deformation behavior of the weld metal, heat affected zone (HAZ), and base metal, but also creep strain evolution for each sub-region within the HAZ itself, including coarse-grained HAZ, fine-grained HAZ (FGHAZ), and intercritical HAZ (ICHAZ). The DIC results revealed that local creep strain in the ICHAZ reached up to 90% strain before final rupture, whereas nominal creep strain measured by the standard extensometer of the tested cross-weld specimen was below 10%, indicative of Type IV cracking of the Grade 91 weld. Microstructural analyses revealed that the faster creep degradation/deformation in the HAZ was caused mainly by accelerated matrix grain recrystallization/growth and a reduced pinning effect from the segregated andmore »« less

Authors:

^[1]; Zhang, Wei ^[1];

^[1];

^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division

Publication Date:: Sat Jan 02 00:00:00 EST 2021

Research Org.:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Fossil Energy (FE); USDOE Office of Fossil Energy and Carbon Management (FECM)

OSTI Identifier:: 1684689

Alternate Identifier(s):: OSTI ID: 2006686

Grant/Contract Number:: AC05-00OR22725; FWP-FEAA118

Resource Type:: Accepted Manuscript

Journal Name:: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

Additional Journal Information:: Journal Volume: 799; Journal Issue: na; Journal ID: ISSN 0921-5093

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; grade 91 steel; localized creep deformation; heat affected zone; microstructure; digital image correlation; type IV cracking

Citation Formats


                    Wang, Yiyu, Zhang, Wei, Wang, Yanli, Lim, Yong Chae, Yu, Xinghua, and Feng, Zhili. Experimental evaluation of localized creep deformation in grade 91 steel weldments.  United States: N. p., 2021. 
Web.  doi:10.1016/j.msea.2020.140356.

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                    Wang, Yiyu, Zhang, Wei, Wang, Yanli, Lim, Yong Chae, Yu, Xinghua, & Feng, Zhili. Experimental evaluation of localized creep deformation in grade 91 steel weldments.  United States.  https://doi.org/10.1016/j.msea.2020.140356

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                    Wang, Yiyu, Zhang, Wei, Wang, Yanli, Lim, Yong Chae, Yu, Xinghua, and Feng, Zhili. Sat .  
"Experimental evaluation of localized creep deformation in grade 91 steel weldments".  United States.  https://doi.org/10.1016/j.msea.2020.140356.  https://www.osti.gov/servlets/purl/1684689.

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@article{osti_1684689,

  title        = {Experimental evaluation of localized creep deformation in grade 91 steel weldments},

  author       = {Wang, Yiyu and Zhang, Wei and Wang, Yanli and Lim, Yong Chae and Yu, Xinghua and Feng, Zhili},

  abstractNote = {Spatially resolved measurement of localized creep deformation in heterogeneous creep resistant steel weldments is crucial but challenging for lifetime assessments of critical steam components in power plants. Here, experimental approaches were established to quantitatively evaluate commonly observed localized creep deformation in multi-pass Grade 91 steel weldments. An in-situ digital image correlation (DIC) system was utilized with a creep testing frame to monitor and measure both full-field strain and localized strain accumulation across the weldments during long-term creep testing at elevated temperatures. The in situ DIC method measured not only the creep deformation behavior of the weld metal, heat affected zone (HAZ), and base metal, but also creep strain evolution for each sub-region within the HAZ itself, including coarse-grained HAZ, fine-grained HAZ (FGHAZ), and intercritical HAZ (ICHAZ). The DIC results revealed that local creep strain in the ICHAZ reached up to 90% strain before final rupture, whereas nominal creep strain measured by the standard extensometer of the tested cross-weld specimen was below 10%, indicative of Type IV cracking of the Grade 91 weld. Microstructural analyses revealed that the faster creep degradation/deformation in the HAZ was caused mainly by accelerated matrix grain recrystallization/growth and a reduced pinning effect from the segregated and coarsened precipitates in the FGHAZ and ICHAZ. The ultimate creep rupture occurred in the ICHAZ owing to its lowest creep resistance induced by the largest recrystallized grain size, the lowest fraction of coincidence site lattice, and the lowest local strain energies/dislocation densities.},

  doi          = {10.1016/j.msea.2020.140356},

  journal      = {Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing},

  number       = na,

  volume       = 799,

  place        = {United States},

  year         = {Sat Jan 02 00:00:00 EST 2021},

  month        = {Sat Jan 02 00:00:00 EST 2021}

}

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Title: Experimental evaluation of localized creep deformation in grade 91 steel weldments

Abstract

Citation Formats

Review Type IV cracking in ferritic power plant steels journal, December 2006

Welding and weldability of candidate ferritic alloys for future advanced ultrasupercritical fossil power plants journal, November 2013

Factors affecting Type IV creep damage in Grade 91 steel welds journal, August 2013

Measurement of Creep Deformation across Welds in 316H Stainless Steel Using Digital Image Correlation journal, December 2016

Creep rupture properties of HAZs of a high Cr ferritic steel simulated by a weld simulator journal, March 2004

Characterization of Microstructures across the Heat-Affected Zone of the Modified 9Cr-1Mo Weld Joint to Understand Its Role in Promoting Type IV Cracking journal, January 2007

Review of type IV cracking of weldments in 9–12%Cr creep strength enhanced ferritic steels journal, November 2013

Creep damage evaluation of 9Cr–1Mo–V–Nb steel welded joints showing Type IV fracture journal, January 2006

Strain localization in creep testing of samples with heterogeneous microstructures journal, September 1996

Two-dimensional digital image correlation for in-plane displacement and strain measurement: a review journal, April 2009

A review of non-destructive techniques for the detection of creep damage in power plant steels journal, October 2010

Heterogeneous creep deformation in Dissimilar Metal Welds (DMWs) journal, March 2019

A methodology for high resolution digital image correlation in high temperature experiments journal, March 2015

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A Review of Strain Analysis Using Electron Backscatter Diffraction journal, March 2011

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Grain Boundary Engineering of 10% Cr Ferritic-Martensitic Steel SUH3 journal, January 2015

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Correlation Between Intercritical Heat-Affected Zone and Type IV Creep Damage Zone in Grade 91 Steel journal, February 2018

Insight into Type IV cracking in Grade 91 steel weldments journal, May 2020

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Review Type IV cracking in ferritic power plant steels
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Welding and weldability of candidate ferritic alloys for future advanced ultrasupercritical fossil power plants
journal, November 2013

Factors affecting Type IV creep damage in Grade 91 steel welds
journal, August 2013

Measurement of Creep Deformation across Welds in 316H Stainless Steel Using Digital Image Correlation
journal, December 2016

Creep rupture properties of HAZs of a high Cr ferritic steel simulated by a weld simulator
journal, March 2004

Characterization of Microstructures across the Heat-Affected Zone of the Modified 9Cr-1Mo Weld Joint to Understand Its Role in Promoting Type IV Cracking
journal, January 2007

Review of type IV cracking of weldments in 9–12%Cr creep strength enhanced ferritic steels
journal, November 2013

Creep damage evaluation of 9Cr–1Mo–V–Nb steel welded joints showing Type IV fracture
journal, January 2006

Strain localization in creep testing of samples with heterogeneous microstructures
journal, September 1996

Two-dimensional digital image correlation for in-plane displacement and strain measurement: a review
journal, April 2009

A review of non-destructive techniques for the detection of creep damage in power plant steels
journal, October 2010

Heterogeneous creep deformation in Dissimilar Metal Welds (DMWs)
journal, March 2019

A methodology for high resolution digital image correlation in high temperature experiments
journal, March 2015

Hardness model for creep-life assessment of high-strength martensitic steels
journal, June 2009

A Review of Strain Analysis Using Electron Backscatter Diffraction
journal, March 2011

A new grain orientation spread approach to analyze the dynamic recrystallization behavior of a cast-homogenized Mg-Zn-Zr alloy using electron backscattered diffraction
journal, January 2018

Mechanisms of grain boundary engineering
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Grain boundary engineering for structure materials of nuclear reactors
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Influence of Coincidence Site Lattice Boundary on Creep Resistance of P91 Steel Weldments
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Correlation Between Intercritical Heat-Affected Zone and Type IV Creep Damage Zone in Grade 91 Steel
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