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Investigation of local brittle zone in multipass welded joint of NiCrMoV steel with heavy section

Published online by Cambridge University Press:  26 February 2018

Yifei Li
Affiliation:
Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
Zhipeng Cai*
Affiliation:
Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China; State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China; and Collaborative Innovation Center of Advanced Nuclear Energy Technology, Tsinghua University, Beijing 100084, China
Kejian Li
Affiliation:
Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
Jiluan Pan
Affiliation:
Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
Xia Liu
Affiliation:
Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China; and Shanghai Turbine Plant of Shanghai Electric Power Generation Equipment Co. Ltd., Shanghai 200240, China
Lingen Sun
Affiliation:
Technology Development Department, Shanghai Turbine Plant of Shanghai Electric Power Generation Equipment Co. Ltd., Shanghai 200240, China
Peng Wang
Affiliation:
Technology Development Department, Shanghai Turbine Plant of Shanghai Electric Power Generation Equipment Co. Ltd., Shanghai 200240, China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Welding was successfully used in the fabrication of low pressure steam turbine rotors for nuclear power plants. In this paper, the local brittle zone of the welded joint in NiCrMoV steel with heavy section was investigated by cross-zone fracture toughness test and the effect of martensite–austenite constituent in the simulated reheated zone of welds with different second peak temperature on toughness was analyzed. The results showed that the crack propagated in unstable manner in the reheated zone of welds where the martensite–austenite constituent promoted the initiation and propagation of the crack. The fine structure of martensite–austenite constituent contained retained austenite, martensite, and martensite–austenite mixture microstructure. The impact toughness deteriorated drastically in the incomplete phase transition zone for the simulated reheated zone of welds related to the formation of mixture microstructure in which large blocky martensite–austenite constituent at prior austenite grain boundaries and inside the grains were distributed in the shape of network.

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Article
Copyright
Copyright © Materials Research Society 2018 

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Footnotes

Contributing Editor: Jürgen Eckert

References

REFERENCES

Liu, P., Lu, F., Liu, X., Ji, H., and Gao, Y.: Study on fatigue property and microstructure characteristics of welded nuclear power rotor with heavy section. J. Alloys Compd. 584, 430 (2014).CrossRefGoogle Scholar
Liu, X. and Wen, Z.: Best available techniques and pollution control: A case study on China’s thermal power industry. J. Cleaner Prod. 23, 113 (2012).CrossRefGoogle Scholar
Liu, Z.D.: Status of the power industry in China and overall progress for a-usc technology. Presented at the 8th International Conference on Advances in Materials Technology for Fossil Power Plants (ASM International, Materials Park, Ohio, 2016).Google Scholar
Klueh, R.L.: Elevated temperature ferritic and martensitic steels and their application to future nuclear reactors. Int. Mater. Rev. 50, 287 (2005).CrossRefGoogle Scholar
Chen, R.K., Gu, J.F., Han, L.Z., and Pan, J.S.: Novel process to refine grain size of NiCrMoV steel. Mater. Sci. Technol. 28, 773 (2012).CrossRefGoogle Scholar
Ramakrishnan, M. and Muthupandi, V.: Application of submerged arc welding technology with cold wire addition for drum shell long seam butt welds of pressure vessel components. Int. J. Adv. Manuf. Technol. 65, 945 (2013).CrossRefGoogle Scholar
Shige, T., Magoshi, R., Itou, S., Ichimura, T., and Kondou, Y.: Development of large-capacity, highly efficient welded rotor for steam turbines. Mitsubishi Heavy Ind. 38, 6 (2001).Google Scholar
Sattari-Far, I. and Farahani, M.R.: Effect of the weld groove shape and pass number on residual stresses in butt-welded pipes. Int. J. Pressure Vessels Piping 86, 723 (2009).CrossRefGoogle Scholar
Murugan, S., Kumar, P.V., Raj, B., and Bose, M.S.C.: Temperature distribution during multipass welding of plates. Int. J. Pressure Vessels Piping 75, 891 (1998).CrossRefGoogle Scholar
Karaoğlu, S., and Seçgin, A.: Sensitivity analysis of submerged arc welding process parameters. J. Mater. Process. Technol. 202, 500 (2008).CrossRefGoogle Scholar
Gunaraj, V. and Murugan, N.: Application of response surface methodology for predicting weld bead quality in submerged arc welding of pipes. J. Mater. Process. Technol. 88, 266 (1999).CrossRefGoogle Scholar
Lu, F., Liu, X., Wang, P., Wu, Q., Cui, H., and Huo, X.: Microstructural characterization and wide temperature range mechanical properties of NiCrMoV steel welded joint with heavy section. J. Mater. Res. 30, 2108 (2015).CrossRefGoogle Scholar
Prasad, K. and Dwivedi, D.K.: Some investigations on microstructure and mechanical properties of submerged arc welded HSLA steel joints. Int. J. Adv. Manuf. Technol. 36, 475 (2008).CrossRefGoogle Scholar
Liu, X., Cai, Z., Deng, X., and Lu, F.: Investigation on the weakest zone in toughness of 9Cr/NiCrMoV dissimilar welded joint and its enhancement. J. Mater. Res. 32, 3117 (2017).CrossRefGoogle Scholar
Yu, L., Wang, H.H., Wang, X.L., Huang, G., Hou, T.P., and Wu, K.M.: Improvement of impact toughness of simulated heat affected zone by addition of aluminium. Mater. Sci. Technol. 30, 1951 (2014).CrossRefGoogle Scholar
Di, X.J., An, X., Cheng, F.J., Wang, D.P., Guo, X.J., and Xue, Z.K.: Effect of martensite–austenite constituent on toughness of simulated inter-critically reheated coarse-grained heat-affected zone in X70 pipeline steel. Sci. Technol. Weld. Joining 21, 366 (2016).CrossRefGoogle Scholar
Chen, J.H., Kikuta, Y., Araki, T., Yoneda, M., and Matsuda, Y.: Micro-fracture behaviour induced by M–A constituent (Island Martensite) in simulated welding heat affected zone of HT80 high strength low alloyed steel. Acta Metall. 32, 1779 (1984).CrossRefGoogle Scholar
Li, Y. and Baker, T.N.: Effect of morphology of martensite–austenite phase on fracture of weld heat affected zone in vanadium and niobium microalloyed steels. Mater. Sci. Technol. 26, 1029 (2010).CrossRefGoogle Scholar
Davis, C.L. and King, J.E.: Cleavage initiation in the intercritically reheated coarse-grained heat-affected zone: Part I. Fractographic evidence. Metall. Mater. Trans. A 25, 563 (1994).CrossRefGoogle Scholar
Lan, L., Qiu, C., Song, H., and Zhao, D.: Correlation of martensite–austenite constituent and cleavage crack initiation in welding heat affected zone of low carbon bainitic steel. Mater. Lett. 125, 86 (2014).CrossRefGoogle Scholar
Davis, C.L. and King, J.E.: Effect of cooling rate on intercritically reheated microstructure and toughness in high strength low alloy steel. Mater. Sci. Technol. 9, 8 (1993).CrossRefGoogle Scholar
Shi, Y. and Han, Z.: Effect of weld thermal cycle on microstructure and fracture toughness of simulated heat-affected zone for a 800 MPa grade high strength low alloy steel. J. Mater. Process. Technol. 207, 30 (2008).CrossRefGoogle Scholar
Zhu, Z., Kuzmikova, L., Li, H., and Barbaro, F.: Effect of inter-critically reheating temperature on microstructure and properties of simulated inter-critically reheated coarse grained heat affected zone in X70 steel. Mater. Sci. Eng., A 605, 8 (2014).CrossRefGoogle Scholar
Moeinifar, S., Kokabi, A.H., and Hosseini, H.R.M.: Effect of tandem submerged arc welding process and parameters of Gleeble simulator thermal cycles on properties of the intercritically reheated heat affected zone. Mater. Des. 32, 869 (2011).CrossRefGoogle Scholar
Matsuda, F., Fukada, Y., Okada, H., Shiga, C., Ikeuchi, K., Horii, Y., Shiwaku, T., and Suzuki, S.: Review of mechanical and metallurgical investigations of martensite–austenite constituent in welded joints in Japan. Welding World Le Sou 3, 134 (1996).Google Scholar
Hiroshi, I., Hiroaki, O., Toyoaki, T., T.O.I.O. Technology, and P.K.C. Ltd.: Effect of martensite–austenite constituent on HAZ toughness of a high strength steel. Trans. Jpn. Weld. Soc. 11, 87 (1980).Google Scholar
Kim, B.C., Lee, S., Kim, N.J., and Lee, D.Y.: Microstructure and local brittle zone phenomena in high-strength low-alloy steel welds. Metall. Trans. A 22, 139 (1991).CrossRefGoogle Scholar
Wang, X.L., Wang, X.M., Shang, C.J., and Misra, R.D.K.: Characterization of the multi-pass weld metal and the impact of retained austenite obtained through intercritical heat treatment on low temperature toughness. Mater. Sci. Eng., A 649, 282 (2016).CrossRefGoogle Scholar
Li, X., Fan, Y., Ma, X., Subramanian, S.V., and Shang, C.: Influence of martensite–austenite constituents formed at different intercritical temperatures on toughness. Mater. Des. 67, 457 (2015).CrossRefGoogle Scholar
Akselsen, O.M., Grong, Ø., and Solberg, J.K.: Structure–property relationships in intercritical heat affected zone of low-carbon microalloyed steels. Mater. Sci. Technol. 3, 649 (1987).CrossRefGoogle Scholar
Li, X., Ma, X., Subramanian, S.V., Shang, C., and Misra, R.D.K.: Influence of prior austenite grain size on martensite–austenite constituent and toughness in the heat affected zone of 700 MPa high strength linepipe steel. Mater. Sci. Eng., A 616, 141 (2014).CrossRefGoogle Scholar
Lanzillotto, C.A.N. and Pickering, F.B.: Structure–property relationships in dual-phase steels. Met. Sci. 16, 371 (1982).CrossRefGoogle Scholar
Sakuma, Y., Matsumura, O., and Takechi, H.: Mechanical properties and retained austenite in intercritically heat-treated bainite-transformed steel and their variation with Si and Mn additions. Metall. Mater. Trans. A 22, 489 (1991).CrossRefGoogle Scholar
Lee, S., Kim, B.C., and Lee, D.Y.: Fracture mechanism in coarse grained HAZ of HSLA steel welds. Scr. Metall. 23, 995 (1989).CrossRefGoogle Scholar
Ranade, R.S., Barbara, F.J., Williams, J.G., Munroe, P.R., and Krauklis, P.: Relationship between martensite islands and haz fracture toughness in welded Ni–Cu structural steels. J. Phys. IV 5, 311 (1995).Google Scholar
Moeinifar, S., Kokabi, A.H., and Hosseini, H.R.M.: Influence of peak temperature during simulation and real thermal cycles on microstructure and fracture properties of the reheated zones. Mater. Des. 31, 2948 (2010).CrossRefGoogle Scholar
Porter, D.A., Easterling, K.E., and Sherif, M.: Phase Transformations in Metals and Alloys, revised Reprint (CRC Press, Boca Raton, USA, 2009).Google Scholar
Komizo, Y.I. and Fukada, Y.: CTOD properties and M–A constituent in the HAZ of C–Mn microalloyed steel. J. Jpn. Weld. Soc. 6, 41 (1988).CrossRefGoogle Scholar
Mohseni, P., Solberg, J.K., Karlsen, M., Akselsen, O.M., and Østby, E.: Investigation of mechanism of cleavage fracture initiation in intercritically coarse grained heat affected zone of HSLA steel. Mater. Sci. Technol. 28, 1261 (2012).CrossRefGoogle Scholar
Zhu, Z., Kuzmikova, L., Li, H., and Barbaro, F.: The effect of chemical composition on microstructure and properties of intercritically reheated coarse-grained heat-affected zone in X70 steels. Metall. Mater. Trans. B 45, 229 (2014).CrossRefGoogle Scholar
Okada, H., Ikeuchi, K., Matsuda, F., and Hrivnak, I.: Effects of M–A constituent on fracture behaviour of weld HAZs: Deterioration and improvement of HAZ toughness in 780 and 980 MPa class HSLA steels welded with high heat input (5th report). Weld. Int. 9, 621 (1995).CrossRefGoogle Scholar
Xu, W.W., Wang, Q.F., Pan, T., and Yang, C.F.: Effect of welding heat input on simulated HAZ microstructure and toughness of a V–N microalloyed steel. J. Iron Steel Res. Int. 14, 234 (2007).CrossRefGoogle Scholar