Characteristics of Premature Creep Failure in Over-tempered Base Metal of Grade 91 Steel Weldment

Wang, Yiyu; Zhang, Wei; Wang, Yanli; Feng, Zhili

doi:10.1016/j.ijpvp.2021.104396

Characteristics of Premature Creep Failure in Over-tempered Base Metal of Grade 91 Steel Weldment

Journal Article · Fri Apr 02 00:00:00 EDT 2021 · International Journal of Pressure Vessels and Piping

DOI:https://doi.org/10.1016/j.ijpvp.2021.104396· OSTI ID:1779144

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

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

Characteristics of premature creep failure in the over-tempered base metal (OT-BM) of a Grade 91 steel weldment are investigated with specially designed creep experiments and advanced microstructure characterization. In situ digital image correlation (DIC) strain measurements reveal that local creep strain as high as 100% accumulated in the OT-BM, compared with only 10% nominal strain over the gauge length. The creep strain rate in the OT-BM is identical to that in the intercritical heat-affected zone and fine-grained heat-affected zone at the secondary creep stage and early tertiary stage, but faster at the late tertiary stage. Microstructural analysis shows that highly recovered microstructure in the OT-BM leads to the lowest hardness, the largest grain size, the lowest fraction of coincidence site lattice boundaries, and the lowest localized strain energy. Dislocation creep and transgranular creep fracture are the dominant deformation and fracture mechanisms in the OT-BM under the current creep testing condition of a low temperature (550 °C) and a high stress (215 MPa).

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE; USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1779144

Alternate ID(s):: OSTI ID: 1777528
OSTI ID: 23196908

Journal Information:: International Journal of Pressure Vessels and Piping, Journal Name: International Journal of Pressure Vessels and Piping Journal Issue: 08 Vol. 192; ISSN 0308-0161

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

References (24)

Characterization of Microstructures across the Heat-Affected Zone of the Modified 9Cr-1Mo Weld Joint to Understand Its Role in Promoting Type IV Cracking Laha, K.; Chandravathi, K. S.; Parameswaran, P. Metallurgical and Materials Transactions A, Vol. 38, Issue 1 https://doi.org/10.1007/s11661-006-9050-0	journal	January 2007
Type IV Cracking Susceptibility in Weld Joints of Different Grades of Cr-Mo Ferritic Steel Laha, K.; Chandravathi, K. S.; Parameswaran, P. Metallurgical and Materials Transactions A, Vol. 40, Issue 2 https://doi.org/10.1007/s11661-008-9724-x	journal	December 2008
Formation Mechanism of Type IV Failure in High Cr Ferritic Heat-Resistant Steel-Welded Joint Liu, Y.; Tsukamoto, S.; Shirane, T. Metallurgical and Materials Transactions A, Vol. 44, Issue 10 https://doi.org/10.1007/s11661-013-1801-0	journal	May 2013
Identification and Characterization of Intercritical Heat-Affected Zone in As-Welded Grade 91 Weldment Wang, Yiyu; Kannan, Rangasayee; Li, Leijun Metallurgical and Materials Transactions A, Vol. 47, Issue 12 https://doi.org/10.1007/s11661-016-3736-8	journal	September 2016
The Influence of Thermal Cycles on the Microstructure of Grade 92 Steel Xu, X.; West, G. D.; Siefert, J. A. Metallurgical and Materials Transactions A, Vol. 48, Issue 11 https://doi.org/10.1007/s11661-017-4306-4	journal	September 2017
Correlation Between Intercritical Heat-Affected Zone and Type IV Creep Damage Zone in Grade 91 Steel Wang, Yiyu; Kannan, Rangasayee; Li, Leijun Metallurgical and Materials Transactions A, Vol. 49, Issue 4 https://doi.org/10.1007/s11661-018-4490-x	journal	February 2018
The role of coincidence-site-lattice boundaries in creep of Ni-16Cr-9Fe at 360 °C Thaveeprungsriporn, Visit; Was, Gary S. Metallurgical and Materials Transactions A, Vol. 28, Issue 10 https://doi.org/10.1007/s11661-997-0167-6	journal	October 1997
A first report on deformation-mechanism maps Ashby, M. F. Acta Metallurgica, Vol. 20, Issue 7 https://doi.org/10.1016/0001-6160(72)90082-X	journal	July 1972
Overview No. 3 Fracture-mechanism maps and their construction for f.c.c. metals and alloys Ashby, M. F.; Gandhi, C.; Taplin, D. M. R. Acta Metallurgica, Vol. 27, Issue 5 https://doi.org/10.1016/0001-6160(79)90105-6	journal	May 1979
Type IV creep cavity accumulation and failure in steel welds Smith, D. J.; Walker, N. S.; Kimmins, S. T. International Journal of Pressure Vessels and Piping, Vol. 80, Issue 9 https://doi.org/10.1016/S0308-0161(03)00134-0	journal	September 2003
Creep damage evaluation of 9Cr–1Mo–V–Nb steel welded joints showing Type IV fracture Watanabe, Takashi; Tabuchi, Masaaki; Yamazaki, Masayoshi International Journal of Pressure Vessels and Piping, Vol. 83, Issue 1 https://doi.org/10.1016/j.ijpvp.2005.09.004	journal	January 2006
Creep rates of heat-affected zone of grade 91 pipe welds as determined by stress-relaxation test Li, Leijun; Silwal, Bishal; Deceuster, Andrew International Journal of Pressure Vessels and Piping, Vol. 146 https://doi.org/10.1016/j.ijpvp.2016.07.008	journal	October 2016
Insight into Type IV cracking in Grade 91 steel weldments Wang, Yiyu; Kannan, Rangasayee; Li, Leijun Materials & Design, Vol. 190 https://doi.org/10.1016/j.matdes.2020.108570	journal	May 2020
Creep rupture behavior of 9Cr–1.8W–0.5Mo–VNb (ASME grade 92) ferritic steel weld joint Sakthivel, T.; Vasudevan, M.; Laha, K. Materials Science and Engineering: A, Vol. 591 https://doi.org/10.1016/j.msea.2013.10.071	journal	January 2014
Influence of Coincidence Site Lattice Boundary on Creep Resistance of P91 Steel Weldments Das, C. R.; Albert, S. K.; Laha, K. Procedia Engineering, Vol. 86 https://doi.org/10.1016/j.proeng.2014.11.014	journal	January 2014
The role of stress in the efficacy of coincident site lattice boundaries in improving creep and stress corrosion cracking Alexandreanu, Bogdan; Was, Gary S. Scripta Materialia, Vol. 54, Issue 6 https://doi.org/10.1016/j.scriptamat.2005.11.051	journal	March 2006
Clarification of creep deformation mechanism in heat-affected zone of 9Cr steels with In Situ experiments Wang, Yiyu; Zhang, Wei; Huang, Hui Scripta Materialia, Vol. 194 https://doi.org/10.1016/j.scriptamat.2020.113640	journal	March 2021
Type IV cracking behaviour of modified 9Cr-1Mo steel weld joints Sakthivel, T.; Laha, K.; Vasudevan, M. Materials at High Temperatures, Vol. 33, Issue 2 https://doi.org/10.1080/09603409.2015.1137158	journal	March 2016
Influence of joint thickness on Type IV cracking behaviour of modified 9Cr-1Mo steel weld joint Sakthivel, T.; Chandravathi, K. S.; Laha, K. Materials at High Temperatures, Vol. 36, Issue 3 https://doi.org/10.1080/09603409.2018.1536410	journal	October 2018
Effect of multiaxial stress state on creep damage in ASME T92 welded joint Wang, Xiao; Wang, Xue; Wang, Chuang Fatigue & Fracture of Engineering Materials & Structures, Vol. 43, Issue 5 https://doi.org/10.1111/ffe.13160	journal	May 2020
Welding and weldability of candidate ferritic alloys for future advanced ultrasupercritical fossil power plants David, S. A.; Siefert, J. A.; Feng, Z. Science and Technology of Welding and Joining, Vol. 18, Issue 8 https://doi.org/10.1179/1362171813Y.0000000152	journal	November 2013
Weldability and weld performance of candidate austenitic alloys for advanced ultrasupercritical fossil power plants Siefert, J. A.; David, S. A. Science and Technology of Welding and Joining, Vol. 19, Issue 4 https://doi.org/10.1179/1362171814Y.0000000197	journal	February 2014
Review Type IV cracking in ferritic power plant steels Francis, J. A.; Mazur, W.; Bhadeshia, H. K. D. H. Materials Science and Technology, Vol. 22, Issue 12 https://doi.org/10.1179/174328406X148778	journal	December 2006
Research and Development of Heat-Resistant Materials for Advanced USC Power Plants with Steam Temperatures of 700 °C and Above Abe, Fujio Engineering, Vol. 1, Issue 2 https://doi.org/10.15302/J-ENG-2015031	journal	June 2015

Similar Records

Experimental evaluation of localized creep deformation in grade 91 steel weldments

Journal Article · Fri Jan 01 19:00:00 EST 2021 · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing · OSTI ID:1684689

Type IV failure in weldment of creep resistant ferritic alloys: I. Micromechanical origin of creep strain localization in the heat affected zone

Journal Article · Wed Oct 30 20:00:00 EDT 2019 · Journal of the Mechanics and Physics of Solids · OSTI ID:1607145

Microstructure and Mechanical Properties of Intercritically Treated Grade 91 Steel

Journal Article · Wed Sep 09 20:00:00 EDT 2020 · Materials · OSTI ID:1659354

Related Subjects

42 ENGINEERING
Creep Strength
Digital Image Correlation
Grade 91 Steel
Heat Affected Zone
Microstructure
Over-tempered Base Metal
Type IV Cracking

Characteristics of Premature Creep Failure in Over-tempered Base Metal of Grade 91 Steel Weldment

Citation Formats

References (24)

Similar Records

Related Subjects