Abstract
Ferritic/martensitic 9Cr-1Mo-V-Nb steel also designated as ASTM A335 used in construction of several components of power plants operating in temperature range of 600–650 ºC. In present investigation, dissimilar weld joint of P91 and P92 steel were prepared using the autogenous tungsten inert gas (A-TIG) welding and multi-pass gas tungsten arc welding (GTAW) process. A comparative study was performed on evolution of δ-ferrite patches in weld fusion zone and heat affected zones (HAZs) of welded joints. The evolution of δ-ferrite patches was studied in as-welded and post-weld heat treatment (PWHT) condition. PWHT was carried out at 760 °C for tempering time of 2 h and 6 h, for both A-TIG and GTA weld joints. It was observed that presence of higher content of ferrite stabilizer in P92 steel promote the formation of δ-ferrite patches in weld fusion zone as well as HAZs. To study the effect of welding process and PWHT, Charpy V impact energy and microhardness tests were performed. For microstructure characterization, field-emission scanning electron microscope (FESEM) and optical microscope were utilized.
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C. Pandey, M.M. Mahapatra, P. Kumar, N. Saini, Effect of strain rate and notch geometry on tensile properties and fracture mechanism of creep strength enhanced ferritic P91 steel, J. Nucl. Mater. 498C (2017) 176–186., https://doi.org/10.1016/j.jnucmat.2017.10.037.
B. Silwal, L. Li, A. Deceuster, B. Griffiths, Effect of postweld heat treatment on the toughness of heat-affected zone for grade 91 steel, Weld. Res. 92 (2013) 80s–87s.
C. Pandey, M.M. Mahapatra, P. Kumar, N. Saini, Effect of normalization and tempering on microstructure and mechanical properties of V-groove and narrow-groove P91 pipe weldments, Mater. Sci. Eng. A 685 (2017) 39–49., https://doi.org/10.1016/j.msea.2016.12.079.
Vijaya L. Manugula, Koteswararao V. Rajulapati, G. Madhusudhan Reddy, K. Bhanu, Sankara Rao, Role of evolving microstructure on the mechanical properties of electron beam welded ferritic–martensitic steel in the as-welded and post weld heat-treated states, Mater. Sci. Eng. A 698 (2017) 36–45., https://doi.org/10.1016/j.msea.2017.05.036.
C. Pandey, M. Mohan, P. Kumar, N. Saini, Dissimilar joining of CSEF steels using autogenous tungsten-inert gas welding and gas tungsten arc welding and their effect on δ-ferrite evolution and mechanical properties, J. Manuf. Process. 31 (2018) 247–259., https://doi.org/10.1016/j.jmapro.2017.11.020.
M.L. Santella, R.W. Swindeman, R.W. Reed, J.M. Tanzosh, Martensite formation in 9Cr–1Mo steel weld metal and its effect on creep behavior, n.d.
B. Arivazhagan, R. Prabhu, S.K. Albert, M. Kamaraj, S. Sundaresan, Microstructure and mechanical properties of 9Cr–1Mo steel weld fusion zones as a function of weld metal composition, J. Mater. Eng. Perform. 18 (2009) 999–1004., https://doi.org/10.1007/s11665-008-9349-7.
C. Pandey, M.M. Mahapatra, Effect of heat treatment on microstructure and hot impact toughness of various zones of P91 welded pipes, J. Mater. Eng. Perform. 25 (2016) 2195–2210., https://doi.org/10.1007/s11665-016-2064-x.
L. Schafer, Influence of delta ferrite and dendritic carbides on the impact and tensile properties of a martensitic chromium steel, J. Nucl. Mater. 263 (1998) 1336–1339.
R.G. Faulkner, J.A. Williams, E.G. Sanchez, A.W. Marshall, Influence of Co, Cu and W on Microstructure of 9% Cr Steel Weld Metals, vol. 19, 2003, https://doi.org/10.1179/026708303225009652.
K.S. Chandravathi, K. Laha, K.B.S. Rao, S.L. Mannan, Microstructure and tensile properties of modified 9Cr–1Mo steel (grade 91), Mater. Sci. Technol. 17 (2001) 559–565.
P.J. Grobenr, W.C. Hagel, The effect of molybdenum on high-temperature properties of 9 Pct Cr steels, Metall. Trans. A 11A (1980) 633–642.
K. Anderko, L. Sch, A.K. Ewaiom, Effect of the δ-ferrite phase on the impact properties chromium steels, J. Nucl. Mater. 179–181 (1991) 492–495.
X.Y. Liu, T. Fujita, Chromium chromium, ISIJ Int. 29 (1989) 680–686.
E.D. Specht, S.M. Allen, Communication Cr Steel Investigated by In-Situ X-Ray Radiation, 2010, 2–5., https://doi.org/10.1007/s11661-010-0371-7.
X. Tao, J. Gu, L. Han, Characterization of precipitates in X12CrMoWVNbN10-1-1 steel during heat treatment, J. Nucl. Mater. 452 (2014) 557–564., https://doi.org/10.1016/j.jnucmat.2014.06.018.
C. Pandey, A. Giri, M.M. Mahapatra, Evolution of phases in P91 steel in various heat treatment conditions and their effect on microstructure stability and mechanical properties, Mater. Sci. Eng. A 664 (2016) 58–74., https://doi.org/10.1016/j.msea.2016.03.132.
C. Pandey, M. Mahapatra, Evolution of phases during tempering of P91 steel at 760 for varying tempering time and their effect on microstructure and mechanical properties, Proc. Inst. Mech. Eng. Part E J. Process Mech. Eng. 664 (2016) 58–74., https://doi.org/10.1177/0954408916656678.
N. Saini, C. Pandey, M.M. Mahapatra, Characterization and evaluation of mechanical properties of CSEF P92 steel for varying normalizing temperature, Mater. Sci. Eng. A (2017), https://doi.org/10.1016/j.msea.2017.02.022.
N. Saini, C. Pandey, M. Mohan, Microstructure evolution and mechanical properties of dissimilar welded joint of P911 and P92 steel for subsequent PWHT and N&T treatment, Trans. Indian Inst. Met. (2017), https://doi.org/10.1007/s12666-017-1145-3.
C.G. Panait, A. Zielinska-Lipiec, T. Koziel, A. Czyrska-filemonowicz, A.F. Gourgues-Lorenzon, W. Bendick, Evolution of dislocation densit, size of subgrains and MX-type precipitates in a P91 steel during creep and during thermal ageing at 600 ºC for more than 100,000 h, Mater. Sci. Eng. A 527 (2010) 4062–4069., https://doi.org/10.1016/j.msea.2010.03.010.
C. Pandey, M.M. Mahapatra, P. Kumar, R.S. Vidyrathy, A. Srivastava, Microstructure-based assessment of creep rupture behaviour of cast-forged, Mater. Sci. Eng. A 695 (2017) 291–301., https://doi.org/10.1016/j.msea.2017.04.037.
C. Pandey, M.M. Mahapatra, P. Kumar, N. Saini, Characterization of cast and forged (C&F) Gr. 91 steel in different heat treatment condition, Trans. Indian Inst. Met. (2017), https://doi.org/10.1007/s12666-017-1144-4.
C. Pandey, M.M. Mahapatra, P. Kumar, A. Giri, Microstructure characterization and Charpy toughness of P91 weldment for as-welded, PWHT and N&T heat treatment, Met. Mater. Int. (2017), https://doi.org/10.1007/s12540-017-6850-2.
C. Pandey, M.M. Mahapatra, P. Kumar, N. Saini, Homogenization of P91 weldments using varying normalizing and tempering treatment, Mater. Sci. Eng. A 710 (2018) 86–101., https://doi.org/10.1016/j.msea.2017.10.086.
S.W. Shyu, H.Y. Huang, K.H. Tseng, C.P. Chou, Study of the performance of stainless steel A-TIG welds, J. Mater. Eng. Perform. 17 (2008) 193–201., https://doi.org/10.1007/s11665-007-9139-7.
J. Onoro, Martensite microstructure of 9–12% Cr steels weld metals, J. Mater. Process. Technol. 180 (2006) 137–142., https://doi.org/10.1016/j.jmatprotec.2006.05.014.
T. Onizawa, T. Wakai, M. Ando, K. Aoto, Effect of V and Nb on precipitation behavior and mechanical properties of high Cr steel, Nucl. Eng. Des. 238 (2008) 408–416., https://doi.org/10.1016/j.nucengdes.2006.09.013.
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Pandey, C., Mahapatra, M.M., Kumar, P. et al. A brief study on δ-ferrite evolution in dissimilar P91 and P92 steel weld joint and their effect on mechanical properties. Archiv.Civ.Mech.Eng 18, 713–722 (2018). https://doi.org/10.1016/j.acme.2017.12.002
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DOI: https://doi.org/10.1016/j.acme.2017.12.002