TIG/PAW composite welding was used to weld SAF2205 duplex stainless steel with three layers and three channels, and solution treatment was carried out. OM, SEM, EBSD and electrochemical corrosion, tensile, impact and other experiments were used to study the relationship between the microstructure evolution of the weld and mechanical properties, corrosion resistance. The results show that the ferrite content of TIG filler wire weld is 70.5%, and the austenite grain of TIG filler wire weld is the largest (177 μm2), which is larger than that of base metal (142 μm2) due to the addition of welding wire. The ferrite content of PAW weld is 65.4%. Due to the different welding sequence, subsequent welding has a heating effect on the weld, resulting in the least ferrite content. In TIG weld, the large heat input results in the coarsening of ferrite grain (8 147 μm2), which is larger than the base metal (264 μm2), resulting in the reduction of austenite core location and only 3.96% austenite. Due to the difference of deformation mechanism and stacking fault energy between austenite and ferrite, the number of ferrite sub-grains is larger than that of austenite, while the number of recrystallized grains and high-angle grain boundary is smaller than that of austenite. After solution treatment at 1 050 ℃ for 60 min, the two phases of the weld are close to 1∶1, and the austenite tends to homogenize, and the corrosion resistance increases with the extension of solution time. The tensile fractures were all in the base metal, and the tensile strength of the weld were greater than 846 MPa. The weld impact energy is 144 J, less than the base metal (156 J), and the weld shows composite fracture.
LI Yajie
,
LIU Rui
,
QIN Fengming
,
MA Chengrui
. Study on microstructure and comprehensive properties of SAF2205 duplex stainless steel multilayer and multipass welded joint[J]. Transactions of The China Welding Institution, 2023
, 44(6)
: 74
-81
.
DOI: 10.12073/j.hjxb.20220803002
[1] Moteshakker A, Danaee I. Microstructure and corrosion resistance of dissimilar weld-joints between duplex stainless steel 2205 and austenitic stainless steel 316L[J]. Journal of Materials Science & Technology, 2016, 32(6): 282 - 290.
[2] Satyanarayana V V, Reddy G M, Mohandas T. Dissimilar metal friction welding of austenitic-ferritic stainless steels[J]. Journal of Materials Processing Technology, 2005, 160(2): 128 - 137.
[3] Verma j, Taiwade R V. Effect of welding processes and conditions on the microstructure, mechanical properties and corrosion resistance of duplex stainless steel weldments—A review[J]. Journal of Manufacturing Processes, 2017, 25: 134 - 152.
[4] Badji R, Bouabdallah M, Bacroix B. Phasetransformation and mechanical behavior in annealed 2205 duplex stainless steelwelds[J]. Materials Characterization, 2008, 59: 447 - 453.
[5] Kim D C, Ogura T, Yamashita S. Computer prediction of α/γ phase fraction in multi-pass weld of duplex stainless steel and microstructural improvement welding process[J]. Materials and Design, 2020, 196: 109154.
[6] Woo W, An G B, Kingston E J. Through-thickness distributions of residual stresses in two extreme heat-input thick welds: A neutron diffraction, contour method and deep hole drilling study[J]. Acta Materialia, 2013, 61(10): 3564 - 3574.
[7] Gao S, Geng S, Jiang P. Numerical analysis of the deformation behavior of 2205 duplex stainless steel TIG weld joint based on the microstructure and micro-mechanical properties[J]. Materials Science & Engineering A, 2021, 815: 141303.
[8] Shen J L, Wei Z J, Zhu X R. Microstructure evolution and mechanical properties of flash butt-welded Inconel 718 joints[J]. Materials Science & Engineering A, 2018, 718: 34 - 42.
[9] Cui S W, Shi Y H, Sun K. Microstructure evolution and mechanical properties of keyhole deep penetration TIG welds of S32101 duplex stainless steel[J]. Materials Science & Engineering A, 2018, 709(2): 214 - 222.
[10] Toth T, Krasnorutskyi S, Hensel J. Electron beam welding of 2205 duplex stainless steel using pre-placed nickel-based filler material[J]. International Journal of Pressure Vessels and Piping, 2021, 191: 104354.
[11] Lai R, Cai Y, Wu Y. Influence of absorbed nitrogen on microstructure and corrosion resistance of 2205 duplex stainless steel joint processed by fiber laser welding[J]. Journal of Materials Processing Technology, 2016, 231: 397 - 405.
[12] Zhang Z Q, Jing H Y, Xua L Y. Effect of post-weld heat treatment on microstructure evolution and pitting corrosion resistance of electron beam-welded duplex stainless steel[J]. Corrosion Science, 2018, 141(15): 30 - 45.
[13] Yang Y Z, Wang Z Y, Tan H. Effect of a brief post-weld heat treatment on the microstructure evolution and pitting corrosion of laser beam welded UNS S31803 duplex stainless steel[J]. Corrosion Science, 2012, 65: 472 - 480.
[14] Jastej S, Shahi A S. Metallurgical and corrosion characterization of electron beam welded duplex stainless steel joints[J]. Journal of Manufacturing Processes, 2020, 50: 581 - 595.
[15] Ku J S, Ho N J, Tjong S C. Properties of electron beam welded SAF 2205 duplex stainless steel[J]. Journal of Manufacturing Processing Technology, 1997, 63(1-3): 770 - 775.
[16] Sieurin H, Sandström R. Austenite reformation in the heat-affected zone of duplex stainless steel 2205[J]. Materials Science & Engineering A, 2006, 418(1-2): 250 - 256.
[17] Mourad A H I, Khourshid A, Sharef T. Gas tungsten arc and laser beam welding processes effects on duplex stainless steel 2205 properties[J]. Materials Science & Engineering A, 2012, 549(15): 105 - 113.
[18] Saravanan S, Raghukandan K, Sivagurumanikandan N. Pulsed Nd: YAG laser welding and subsequent post-weld heat treatment on super duplex stainless steel[J]. Journal of Manufacturing Processes, 2017, 25: 284 - 289.
[19] Zhang Z Q, Jing, H Y, Xu L Y. The impact of annealing temperature on improving microstructure and toughness of electron beam welded duplex stainless steel[J]. Journal of Manufacturing Processes, 2018, 31: 568 - 582.
