Toward Improving the Type IV Cracking Resistance in Cr-Mo Steel Weld Through Thermo-Mechanical Processing

Shassere, Benjamin A.; Yamamoto, Yukinori; Babu, Sudarsanam Suresh

doi:10.1007/s11661-016-3387-9

Title: Toward Improving the Type IV Cracking Resistance in Cr-Mo Steel Weld Through Thermo-Mechanical Processing

Abstract

Detailed microstructure characterization of Grade 91 (Modified 9Cr-1Mo, ASTM A387) steel subjected to a thermo-mechanical treatment (TMT) process was performed to rationalize the cross-weld creep properties. A series of thermo-mechanical processing in the austenite phase region, followed by isothermal aging at temperatures at 973 to 1173 K (700 to 900ºC) was applied to the Grade 91 steel to promote precipitation kinetics of MX (M: Nb and V, X: C and N) in the austenite matrix. Detailed characterization of the base metals after standard tempering confirmed the presence of fine MX dispersion within the tempered martensitic microstructure in steels processed at/and above 1073 K (800 ºC). Relatively low volume fraction of M₂₃C₆ precipitates was observed after processing at 1073 K (800 ºC). The cross-weld creep strength after processing was increased with respect to the increase of MX dispersion, indicating that these MX precipitates maintained during weld thermal cycles in the fine grained heat affected zone (FGHAZ) region and thereby contribute to improved creep resistant of welds in comparison to the welds made with the standard “normalization and tempering” processes. Lastly, the steels processed in this specific processing condition showed improved cross-weld creep resistance and sufficient room-temperature toughness. The above data ismore »« less

Authors:

Shassere, Benjamin A. ^[1]; Yamamoto, Yukinori ^[2]; Babu, Sudarsanam Suresh ^[1]

Univ. of Tennessee, Knoxville, TN (United States). Dept. of Mechanical, Aerospace, and Biomedical Engineering
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division

Publication Date:: Tue Feb 23 00:00:00 EST 2016

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

Sponsoring Org.:: USDOE Office of Fossil Energy (FE)

OSTI Identifier:: 1324056

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

Additional Journal Information:: Journal Volume: 47; Journal Issue: 5; Journal ID: ISSN 1073-5623

Publisher:: ASM International

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE

Citation Formats


                    Shassere, Benjamin A., Yamamoto, Yukinori, and Babu, Sudarsanam Suresh. Toward Improving the Type IV Cracking Resistance in Cr-Mo Steel Weld Through Thermo-Mechanical Processing.  United States: N. p., 2016. 
Web.  doi:10.1007/s11661-016-3387-9.

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                    Shassere, Benjamin A., Yamamoto, Yukinori, & Babu, Sudarsanam Suresh. Toward Improving the Type IV Cracking Resistance in Cr-Mo Steel Weld Through Thermo-Mechanical Processing.  United States.  https://doi.org/10.1007/s11661-016-3387-9

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                    Shassere, Benjamin A., Yamamoto, Yukinori, and Babu, Sudarsanam Suresh. Tue .  
"Toward Improving the Type IV Cracking Resistance in Cr-Mo Steel Weld Through Thermo-Mechanical Processing".  United States.  https://doi.org/10.1007/s11661-016-3387-9.  https://www.osti.gov/servlets/purl/1324056.

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@article{osti_1324056,

  title        = {Toward Improving the Type IV Cracking Resistance in Cr-Mo Steel Weld Through Thermo-Mechanical Processing},

  author       = {Shassere, Benjamin A. and Yamamoto, Yukinori and Babu, Sudarsanam Suresh},

  abstractNote = {Detailed microstructure characterization of Grade 91 (Modified 9Cr-1Mo, ASTM A387) steel subjected to a thermo-mechanical treatment (TMT) process was performed to rationalize the cross-weld creep properties. A series of thermo-mechanical processing in the austenite phase region, followed by isothermal aging at temperatures at 973 to 1173 K (700 to 900ºC) was applied to the Grade 91 steel to promote precipitation kinetics of MX (M: Nb and V, X: C and N) in the austenite matrix. Detailed characterization of the base metals after standard tempering confirmed the presence of fine MX dispersion within the tempered martensitic microstructure in steels processed at/and above 1073 K (800 ºC). Relatively low volume fraction of M23C6 precipitates was observed after processing at 1073 K (800 ºC). The cross-weld creep strength after processing was increased with respect to the increase of MX dispersion, indicating that these MX precipitates maintained during weld thermal cycles in the fine grained heat affected zone (FGHAZ) region and thereby contribute to improved creep resistant of welds in comparison to the welds made with the standard “normalization and tempering” processes. Lastly, the steels processed in this specific processing condition showed improved cross-weld creep resistance and sufficient room-temperature toughness. The above data is also analysed based on existing theories of creep deformation based on dislocation climb mechanism.},

  doi          = {10.1007/s11661-016-3387-9},

  journal      = {Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science},

  number       = 5,

  volume       = 47,

  place        = {United States},

  year         = {Tue Feb 23 00:00:00 EST 2016},

  month        = {Tue Feb 23 00:00:00 EST 2016}

}

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Works referencing / citing this record:

Investigation of Impression Creep Deformation Behavior of Boron-Modified P91 Steel By High-End Characterization Techniques
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Khajuria, Akhil; Bedi, Raman; Kumar, Rajneesh
Lecture Notes on Multidisciplinary Industrial Engineering
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Correlation of Microstructure to Creep Response of Hot Isostatically Pressed and Aged Electron Beam Melted Inconel 718
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journal, September 2019

Akhtar, Modassir; Khajuria, Akhil
Metallography, Microstructure, and Analysis, Vol. 8, Issue 5
DOI: 10.1007/s13632-019-00573-w

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Title: Toward Improving the Type IV Cracking Resistance in Cr-Mo Steel Weld Through Thermo-Mechanical Processing

Abstract

Citation Formats

Precipitate design for creep strengthening of 9% Cr tempered martensitic steel for ultra-supercritical power plants journal, January 2008

Advances in Physical Metallurgy and Processing of Steels. Design of Ferritic Creep-resistant Steels. journal, January 2001

Creep damage and expected creep life for welded 9–11% Cr steels journal, January 2007

Effect of chromium content on loss of creep rupture strength in the heat affected zone of heat-resistant ferritic steel journal, February 2005

Relationship between loss of creep rupture strength and microstructure in the heat affected zone of heat-resistant ferritic steel journal, February 2005

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

Correlation of precipitate stability to increased creep resistance of Cr–Mo steel welds journal, April 2013

Development of new nano-particle-strengthened martensitic steels journal, August 2005

New nano-particle-strengthened ferritic/martensitic steels by conventional thermo-mechanical treatment journal, August 2007

Influence of Deformation on the Precipitation Behavior of Nb(CN) in Austenite and Ferrite journal, June 2014

Effect of MX type particles on creep strength of ferritic steel journal, September 2003

Creep behavior and stability of MX precipitates at high temperature in 9Cr–0.5Mo–1.8W–VNb steel journal, December 2001

Quantification of precipitates in a 10%Cr steel using TEM and EFTEM journal, October 2000

Effect of carbon concentration on precipitation behavior of M23C6 carbides and MX carbonitrides in martensitic 9Cr steel during heat treatment journal, April 2004

Advances in Physical Metallurgy and Processing of Steels. Strengthening Mechanisms of Creep Resistant Tempered Martensitic Steel. journal, January 2001

Crystallography of ausformed upper bainite structure in Fe–9Ni–C alloys journal, November 2006

The morphology and crystallography of lath martensite in Fe-C alloys journal, April 2003

Crystallographic features of lath martensite in low-carbon steel journal, March 2006

Effect of thermo-mechanical treatment on microstructure and mechanical properties of P92 heat resistant steel journal, January 2013

Stabilization of martensitic microstructure in advanced 9Cr steel during creep at high temperature journal, July 2004

Effect of fine precipitation and subsequent coarsening of Fe2W laves phase on the creep deformation behavior of tempered martensitic 9Cr-W steels journal, February 2005

Phase stability and atom probe field ion microscopy of type 308 cre stainless steel weld metal journal, March 1996

Simulation of role of precipitate in creep void occurrence in heat affected zone of high Cr ferritic heat resistant steels journal, September 2005

Effect of stress on microstructural change due to aging at 823 K in multi-layer welded joint of 2.25Cr–1Mo steel journal, March 2004

3D creep cavitation characteristics and residual life assessment in high temperature steels: a critical review journal, May 2014

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Precipitate design for creep strengthening of 9% Cr tempered martensitic steel for ultra-supercritical power plants
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Advances in Physical Metallurgy and Processing of Steels. Design of Ferritic Creep-resistant Steels.
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Creep damage and expected creep life for welded 9–11% Cr steels
journal, January 2007

Effect of chromium content on loss of creep rupture strength in the heat affected zone of heat-resistant ferritic steel
journal, February 2005

Relationship between loss of creep rupture strength and microstructure in the heat affected zone of heat-resistant ferritic steel
journal, February 2005

Review Type IV cracking in ferritic power plant steels
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Correlation of precipitate stability to increased creep resistance of Cr–Mo steel welds
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Development of new nano-particle-strengthened martensitic steels
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Quantification of precipitates in a 10%Cr steel using TEM and EFTEM
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Crystallographic features of lath martensite in low-carbon steel
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Effect of thermo-mechanical treatment on microstructure and mechanical properties of P92 heat resistant steel
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Stabilization of martensitic microstructure in advanced 9Cr steel during creep at high temperature
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Effect of fine precipitation and subsequent coarsening of Fe2W laves phase on the creep deformation behavior of tempered martensitic 9Cr-W steels
journal, February 2005

Phase stability and atom probe field ion microscopy of type 308 cre stainless steel weld metal
journal, March 1996

Simulation of role of precipitate in creep void occurrence in heat affected zone of high Cr ferritic heat resistant steels
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Effect of stress on microstructural change due to aging at 823 K in multi-layer welded joint of 2.25Cr–1Mo steel
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3D creep cavitation characteristics and residual life assessment in high temperature steels: a critical review
journal, May 2014

Carbide precipitation in 12Cr1MoV power plant steel
journal, April 1992

Type IV creep cavity accumulation and failure in steel welds
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Creep rupture behavior of Grade 91 steel
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Results and consequences of a recalculation of the frank-read and the orowan stress
journal, May 1966

Investigation of Impression Creep Deformation Behavior of Boron-Modified P91 Steel By High-End Characterization Techniques
book, March 2019

Correlation of Microstructure to Creep Response of Hot Isostatically Pressed and Aged Electron Beam Melted Inconel 718
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