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Investigation on creep behavior of welded joint of advanced 9%Cr steels

Published online by Cambridge University Press:  12 December 2014

Donghai Meng ,
Fenggui Lu ,
Haichao Cui ,
Yuming Ding ,
Xinhua Tang  and
Xin Huo
Donghai Meng
Affiliation:
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China; and Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
Fenggui Lu*
Affiliation:
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China; and Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
Haichao Cui
Affiliation:
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China; and Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
Yuming Ding
Affiliation:
Shanghai Turbine Plant of Shanghai Electric Power Generation Equipment Co. Ltd., Shanghai 200240, People's Republic of China
Xinhua Tang
Affiliation:
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China; and Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
Xin Huo
Affiliation:
Shanghai Turbine Plant of Shanghai Electric Power Generation Equipment Co. Ltd., Shanghai 200240, People's Republic of China
*
a)Address all correspondence to this author. e-mail: Lfg119@sjtu.edu.cn
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Abstract

The creep behavior of advanced 9%Cr-1 (BM1) and advanced 9%Cr-2 (BM2) dissimilar welded joints was investigated in this paper, and also the microstructures were elaborately characterized. Based on the fitting with MATLAB, a 3-D curved surface describing the primary and steady-state creep stage was achieved. The comparison of the microstructures of the precreep and aftercreep welded joints shows that δ-ferrite distribution in the heat affected zone (HAZ) of BM2 side plays an important role in determining creep rupture strength. Fracture occurred at the overtempered heat affected zone (OT-HAZ) adjacent to BM2 after creep tests at 538 °C under different stress loads. Microhardness tests revealed that the OT-HAZ adjacent to BM2 has the lowest hardness value compared with the whole welded joint. Numerous creep voids occurring around δ-ferrite, carbides, and grain boundaries were observed on the specimen after creep test. They concentrated and grew up to microcracks, and then induced the fracture at OT-HAZ. Many second phases were also observed in the grain boundary after creep, and the tempered martensite boundaries in the HAZ gradually become obscure as the creep time increases.

Keywords

creep behaviordissimilar welded jointovertempered HAZδ-ferrite microstructures
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 2 , 28 January 2015 , pp. 197 - 205
Copyright
Copyright © Materials Research Society 2015 

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References

REFERENCES

Viswanathan, R. and Bakker, W.: Materials for ultra-supercritical coal power plants-boiler materials: Part 1. J. Mater. Eng. Perform. 10, 81 (2001).CrossRefGoogle Scholar
Niu, X.C., Gong, J.M., Jiang, Y., and Bao, J.T.: Creep damage prediction of the steam pipelines with high temperature and high pressure. Int. J. Pressure Vessels Piping 86, 593 (2009).Google Scholar
Saucedo-Muñoz, M.L., Komazaki, S-I., Takahashi, T., Hashida, T., and Shoji, T.: Creep property measurement of service-exposed SUS 316 austenitic stainless steel by the small-punch creep-testing technique. J. Mater. Res. 17, 1945 (2002).CrossRefGoogle Scholar
Hilkes, J. and Gross, V.: Welding CrMo steels for power generation and petrochemical applications-past, present and future. Biul. Inst. Spawal. 1, 11 (2013).Google Scholar
Abe, F.: Bainitic and martensitic creep-resistant steels. Curr. Opin. Solid State Mater. Sci. 8, 305 (2004).Google Scholar
Klueh, R.L. and Nelson, A.T.: Ferritic/martensitic steels for next-generation reactors. J. Nucl. Mater. 371, 37 (2007).CrossRefGoogle Scholar
Park, D.B., Hong, S.M., Lee, K., Huh, M.Y., Suh, J.Y., Lee, S.C., and Jung, W.S.: High-temperature creep behavior and microstructural evolution of an 18Cr9Ni3CuNbVN austenitic stainless steel. Mater. Charact. 93, 52 (2014).Google Scholar
Hishida, J., Kobayashi, M., and Nunokawa, M.: Exergy evaluation of two current advanced power plants: Supercritical steam turbine and combined cycle. J. Energ. Resour. Technol. 119, 250 (1997).Google Scholar
Skleniĉka, V., Kuchařová, K., Svoboda, M., Kloc, L., Buršík, J., and Kroupa, A.: Long-term creep behavior of 9-12% Cr power plant steels. Mater. Charact. 51, 35 (2003).Google Scholar
Jang, J-I., Shim, S., Komazaki, S-I., and Honda, T.: A nanoindentation study on grain-boundary contributions to strengthening and aging degradation mechanisms in advanced 12 Cr ferritic steel. J. Mater. Res. 22, 175 (2007).Google Scholar
Tavassoli, A-A.F., Fournier, B., and Sauzay, M.: High temperature creep-fatigue design and service experience. In Materials for Future Fusion and Fission Technologies, Fu, C.C., Kimura, A., Samaras, M., Serrano do Caro, M., and Stroller, R.E. eds.; Mater. Res. Soc. Symp. Proc, Boston, Massachusetts, Vol. 1125, 2008; p. R02.Google Scholar
Hättestrand, M., Schwind, M., and Andrén, H.O.: Microanalysis of two creep resistant 9-12% chromium steels. Mater. Sci. Eng., A 250, 27 (1998).Google Scholar
Hald, J.: Microstructure and long-term creep properties of 9-12% Cr steels. Int. J. Pressure Vessels Piping 85, 30 (2008).Google Scholar
Staubli, M.E., Kern, K.H., and Mayer, T.U.: COST 501/COST 522– the European collaboration in advanced steam turbine materials for ultra efficient, low emission steam power plant. In Parsons 2000 Advanced Materials for 21st Century Turbines and Power Plants, Strang, A., Conroy, R.D., Banks, W.M., Blackler, M., Leggett, J., McColvin, G.M., Simpson, S., and Smith, M. eds.; Maney Mater. Sci. Proc. 5th Int. Charles Parsons Turb. Conf. London, Cambridge, PA, Vol. 122, 2000; p. 98.Google Scholar
Kim, J. and Kong, B.: Materials technology for PC-TPP in green economic era. Mater. Sci. Forum 654, 398 (2010).Google Scholar
Rothwell, J. and Abson, D.: Performance of weldments in advanced 9%Cr steel-'FB2'. Mater. High Temp. 27, 253 (2010).CrossRefGoogle Scholar
Lu, F., Liu, P., Ji, H., Ding, Y., Xu, X., and Gao, Y.: Dramatically enhanced impact toughness in welded 10%Cr rotor steel by high temperature post-weld heat treatment. Mater. Charact. 92, 149 (2014).Google Scholar
Cui, H., Sun, F., Chen, K., Zhang, L., Wan, R., Shan, A., and Wu, J.: Precipitation behavior of Laves phase in 10%Cr steel X12CrMoWVNbN10-1-1 during short-term creep exposure. Mater. Sci. Eng., A 527, 7505 (2010).Google Scholar
Perrin, I.J. and Fishburn, J.D.: A perspective on the design of high-temperature boiler components. Int. J. Pressure Vessels Piping 85, 14 (2008).Google Scholar
Ulf, K.T., Marc, S., and Brendon, S.: The European efforts in material development for 650 °C USC power plants: COST522. ISIJ Int. 42, 1515 (2002).Google Scholar
Shige, T., Magoshi, R., Ito, S., Ichimura, T., and Kondo, Y.: Development of large-capacity, highly efficient welded rotor for steam turbines. Mitsubishi Heavy Ind. Tech. Rev. 38, 6 (2001).Google Scholar
Tanaka, Y., Kubushiro, K., and Takahashi, S.: Creep-induced microstructural changes in large welded joints of high Cr heat resistant steel. Procedia Eng. 55, 41 (2013).Google Scholar
Madadi, F., Ashrafizadeh, F., and Shamanian, M.: Optimization of pulsed TIG cladding process of stellite alloy on carbon steel using RSM. J. Alloys Compd. 510, 71 (2012).CrossRefGoogle Scholar
Tabuchi, M., Watanabe, T., and Kubo, K.: Creep crack growth behavior in the HAZ of weldments of W containing high Cr steel. Int. J. Pressure Vessels Piping 78, 779 (2001).CrossRefGoogle Scholar
Laha, K., Latha, S., and Rao, K.B.S.: Comparison of creep behaviour of 2.25 Cr-1Mo/9Cr-1Mo dissimilar weld joint with its base and weld metals. Mater. Sci. Technol. 17, 1265 (2001).CrossRefGoogle Scholar
Parker, J.: In-service behaviour of creep strength enhanced ferritic steels grade 91 and grade 92-Part 2 weld issues. Int. J. Pressure Vessels Piping 114, 76 (2012).Google Scholar
Albert, S.K., Matsui, M., and Hongo, H.: Creep rupture properties of HAZs of a high Cr ferritic steel simulated by a weld simulator. Int. J. Pressure Vessels Piping 81, 221 (2004).Google Scholar
Zhao, L., Jing, H., and Xu, L.: Experimental study on creep damage evolution process of type IV cracking in 9Cr-0.5Mo-1.8W-VNb steel welded joint. Eng. Failure Anal. 19, 22 (2012).Google Scholar
Hyde, T.H., Williams, J.A., and Sun, W.: Assessment of creep behaviour of a narrow gap weld. Int. J. Pressure Vessels Piping 76, 515 (1999).Google Scholar
Spigarelli, S. and Quadrini, E.: Analysis of the creep behaviour of modified P91 (9Cr-1Mo-NbV) welds. Mater. Des. 23, 547 (1999).Google Scholar
Kim, B. and Lima, C.J.B.: Creep behavior and microstructural damage of martensitic P92 steel weldment. Mater. Sci. Eng., A 483, 544 (2008).CrossRefGoogle Scholar
Tua, S.T., Seglec, P., and Gong, J.M.: Creep damage and fracture of weldments at high temperature. Int. J. Pressure Vessels Piping 81, 199 (2004).Google Scholar
Zhao, L., Jing, H., Xu, L., An, J., Xiao, G., Xu, D., Chen, Y., and Han, Y.: Investigation on mechanism of type IV cracking in P92 steel at 650 °C. J. Mater. Res. 26, 934 (2011).Google Scholar
Falat, L., rostková, A.V., and Homolová, V.: Creep deformation and failure of E911/E911 and P92/P92 similar weld-joints. Eng. Failure Anal. 16, 2114 (2009).Google Scholar
Wu, Q., Lu, F., Cui, H., Liu, X., Wang, P., and Tang, X.: Role of butter layer in low-cycle fatigue behavior of modified 9Cr and CrMoV dissimilar rotor welded joint. Mater. Des. 59, 165 (2014).Google Scholar
Wu, Q., Lu, F., Cui, H., Ding, Y., liu, X., and Gao, Y.: Microstructure characteristics and temperature-dependent high cycle fatigue behavior of advanced 9%Cr/CrMoV dissimilar welded joint. Mater. Sci. Eng., A 615, 98 (2014).Google Scholar
Castañeda, S.I. and Pérez, F.J.: Microstructure and volatile species determination of ferritic/martensitic FB2 steel in contact with Ar + 40 %H2O at high temperatures. Oxid. Met. 79, 147 (2013).Google Scholar
Brozda, J. and Maciosowski, A.: Weldability, characteristics and benefits of new generation creep-resistant steels and the properties of welded joints. Weld. Int. 18, 599 (2004).Google Scholar
Samal, M.K., Seidenfuss, M., and Roos, E.: Investigation of failure behavior of ferritic-austenitic type of dissimilar steel welded join. Eng. Failure Anal. 18, 999 (2011).CrossRefGoogle Scholar
Collini, L., Giglio, M., and Garziera, R.: Thermomechanical stress analysis of dissimilar welded joints in pipe supports: Structural assessment and design optimization. Eng. Failure Anal. 26, 31 (2012).Google Scholar
Laha, K., Chandravathi, K.S., and Rao, K.B.S.: An assessment of creep deformation and fracture behavior of 2.25 Cr-1Mo similar and dissimilar weld joints. Metall. Mater. Trans. 32, 115 (2001).Google Scholar
Albert, B.S.K., Gill, T.P.S., and Tyagi, A.K.: Soft zone formation in dissimilar welds between two Cr-Mo steels. Weld. J. 76, 135 (1997).Google Scholar
Biswasa, P., Mandal, N.R., and Vasu, P.: Analysis of welding distortion due to narrow-gap welding of upper port plug. Fusion Eng. Des. 85, 780 (2010).Google Scholar
Omprakash, C.M., Kumar, A., and Srivathsa, B.: Prediction of creep curves of high temperature alloys using θ-projection concept. Procedia Eng. 55, 756 (2013).Google Scholar
Hayhurst, D., Tahami, F.V., and Zhou, J.: Constitutive equations for time independent plasticity and creep of 316 stainless steel at 550 °C. Int. J. Pressure Vessels Piping 80, 97 (2003).Google Scholar
Tahami, F.V., Sorkhabi, A.H.D., and Biglari, F.R.: Creep constitutive equations for cold-drawn 304L stainless steel. Mater. Sci. Eng., A 527, 4993 (2010).Google Scholar
Sawada, K., Tabuchi, M., and Kimura, K.: Analysis of long-term creep curves by constitutive equations. Mater. Sci. Eng., A 510, 190 (2009).Google Scholar
May, D.L., Gordon, A.P., and Segletes, D.S.: The application of the Norton-Bailey law for creep prediction through power law regression. ASME Turbo Expo, San Antonio, TX, June 3–7, 2013 (Am. Soc. Mech. Eng., 2013).Google Scholar
Takazawa, H. and Yanagida, N.: Effect of creep constitutive equation on simulated stress mitigation behavior of alloy steel pipe during post-weld heat treatment. Int. J. Pressure Vessels Piping 117–118, 42 (2014).Google Scholar
Kobayashi, S., Sawada, K., and Hara, T.: The formation and dissolution of residual δ ferrite in ASME grade 91 steel plates. Mater. Sci. Eng., A 592, 241 (2014).Google Scholar
Onoro, J.: Weld metal microstructure analysis of 9-12% Cr steels. Int. J. Pressure Vessels Piping 83, 540 (2006).Google Scholar
Lia, S., Eliniyaza, Z., and Zhanga, L.: Microstructural evolution of delta ferrite in SAVE12 steel under heat treatment and short-term creep. Mater. Charact. 73, 144 (2012).Google Scholar
Hong, H.U., Rho, B.S., and Nam, S.W.: Study on the crack initiation and growth from δ-ferrite/γ phase interface under continuous fatigue and creep-fatigue conditions in type 304L stainless steels. Int. J. Fatigue 24, 1063 (2002).Google Scholar