Characterization of microstructure and texture of lean duplex stainless steel 2101 produced by underwater laser wire direct energy deposition

Abstract

Lean duplex stainless steel 2101 (LDX 2101) is a promising material to replace 304 austenitic stainless steel in nuclear power plant in the future and it has been widely studied for its good economy, mechanical properties and corrosion resistance. Aiming at the underwater maintenance of nuclear power, the microstructure and texture evolution of laser wire direct energy deposition in underwater environment were studied by means of optical microscope and electron backscatter diffraction. The results show that the rapid cooling effect of underwater environment on the molten pool inhibits the transformation from ferrite to austenite. Since ferrites have the lowest surface energy, most of them were precipitated along the dense-packed (111)α and (110)α planes. The deposition structure shows typical cube texture and Goss texture. Although the texture of austenite is not as strong as that of ferrite passing through the deposition layer, the results show that the austenite phase was formed with a close Kurdjumov-Sachsorientation orientation relationship with respect to the ferrite phase. It is also found that the cyclic reheating effect of laser wire direct energy deposition not only changes the microstructure and texture, but also affects the grain size and the proportion of special grain boundaries. Improving the content and distribution uniformity of Σ3 grain boundary in the deposition structure is beneficial to improve the corrosion resistance.

Keywords

lean duplex stainless steel / laser wire direct energy deposition / texture evolution / corrosion resistance

References

[[1]] JOHNSON A B, BAILEY W J, SCHREIBER R E, et al. Spent fuel and fuel pool component integrity [R]. Richland, WA: Annual Report, 1979.

[[2]] Komura I. Nondestructive inspection technologies for the inservice inspection of nuclear power plant [J]. Journal of the Japan Institute of Energy, 2004, 83(7): 485-492

[[3]] ZHU Jia-lei, JIAO Xiang-dong. Applications of underwater laser welding in nuclear power plant maintenance [C]// 2011 Second International Conference on Mechanic Automation and Control Engineering. IEEE, 2011: 2947–2950. DOI: https://doi.org/10.1109/MACE.2011.5987606.

[[4]] Westin E M, Olsson C O A, Hertzman S. Weld oxide formation on lean duplex stainless steel [J]. Corrosion Science, 2008, 50(9): 2620-2634,

[[5]] Pilhagen J, Sandström R. Influence of nickel on the toughness of lean duplex stainless steel welds [J]. Materials Science and Engineering A, 2014, 602: 49-57,

[[6]] Hosseini V A, Wessman S, Hurtig K, et al.. Nitrogen loss and effects on microstructure in multipass TIG welding of a super duplex stainless steel [J]. Materials & Design, 2016, 98: 88-97,

[[7]] Pandey C, Thakare J G, Taraphdar P K, et al.. Characterization of the soft zone in dissimilar welds joint of 2.25Cr−1Mo and lean duplex LDX2101 steel [J]. Fusion Engineering and Design, 2021, 163: 112147,

[[8]] Liljas M, Johansson P, Liu H-P, et al.. Development of a lean duplex stainless steel [J]. Steel Research International, 2008, 79(6): 466-473,

[[9]] Feng J-C, Guo W, Francis J, et al.. Narrow gap laser welding for potential nuclear pressure vessel manufacture [J]. Journal of Laser Applications, 2016, 28(2): 022421,

[[10]] Hong J, Joung C Y, Kim K H, et al.. Study on fiber laser welding conditions for the fabrication of a nuclear fuel rod [J]. International Journal of Precision Engineering and Manufacturing, 2014, 15(4): 777-781,

[[11]] Hino T, Tamura M, Tanaka Y, et al.. Development of underwater laser cladding and underwater laser seal welding techniques for reactor components [J]. Journal of Power and Energy Systems, 2009, 3(1): 51-59,

[[12]] TAMURA M, KAWANO S, KOUNO W, et al. Development of underwater laser cladding and underwater laser seal welding techniques for reactor components (II) [C]//Proceedings of 14th International Conference on Nuclear Engineering. Miami, Florida, USA, 2008: 491–494. DOI: https://doi.org/10.1115/ICONE14-89346.

[[13]] Fu Y-L, Guo N, Wang G-H, et al.. Underwater additive manufacturing of Ti−6Al−4V alloy by laser metal deposition: Formability, gran growth and microstructure evolution [J]. Materials & Design, 2021, 197: 109196,

[[14]] Guo N, Wu D, Yu M-Q, et al.. Microstructure and properties of Ti−6Al−4V titanium alloy prepared by underwater wire feeding laser deposition [J]. Journal of Manufacturing Processes, 2022, 73: 269-278,

[[15]] Fu Y-L, Guo N, Zhou C, et al.. Investigation on in situ laser cladding coating of the 304 stainless steel in water environment [J]. Journal of Materials Processing Technology, 2021, 289: 116949,

[[16]] Guo N, Cheng Q, Fu Y-L, et al.. Microstructure and microhardness of aluminium alloy with underwater and in-air wire-feed laser deposition [J]. International Journal of Minerals, Metallurgy and Materials, 2023, 30(4): 670-677,

[[17]] Wang Z D, Sun G F, Chen M Z, et al.. Investigation of the underwater laser directed energy deposition technique for the on-site repair of HSLA-100 steel with excellent performance [J]. Additive Manufacturing, 2021, 39: 101884,

[[18]] Liu Y, Li C-X, Huang X-F, et al.. Investigation on solidification structure and temperature field with novel processing of synchronous powder-feeding underwater laser cladding [J]. Journal of Materials Processing Technology, 2021, 296: 117166,

[[19]] Feng X-R, Cui X-F, Zheng W, et al.. Performance of underwater laser cladded nickel aluminum bronze by applying zinc protective layer and titanium additives [J]. Journal of Materials Processing Technology, 2019, 266: 544-550,

[[20]] Sun G-F, Wang Z-D, Lu Y, et al.. Underwater laser welding/cladding for high-performance repair of marine metal materials: A review [J]. Chinese Journal of Mechanical Engineering, 2022, 35(1): 1-19,

[[21]] Łabanowski J, Fydrych D, Rogalski G, et al.. Underwater welding of duplex stainless steel [J]. Solid State Phenomena, 2011, 183: 101-106,

[[22]] Hu Y, Shi Y-H, Sun K, et al.. Microstructure evolution and mechanical performance of underwater local dry welded DSS metals at various simulated water depths [J]. Journal of Materials Processing Technology, 2019, 264: 366-376,

[[23]] Saravanan S, Sivagurumanikandan N, Raghukandan K. Effect of process parameters in microstructural and mechanical properties of Nd: YAG laser welded super duplex stainless steel [J]. Materials Today: Proceedings, 2021, 39: 1248-1253

[[24]] Li C-W, Zhu J-L, Cai Z-H, et al.. Microstructure and corrosion resistance of underwater laser cladded duplex stainless steel coating after underwater laser remelting processing [J]. Materials, 2021, 14(17): 4965, pmcid: 8434108

[[25]] Wang K, Shao C-L, Jiao X-D, et al.. Investigation on microstructure and properties of duplex stainless steel welds by underwater laser welding with different shielding gas [J]. Materials, 2021, 14(17): 4774, pmcid: 8432456

[[26]] Badji R, Bacroix B, Bouabdallah M. Texture, microstructure and anisotropic properties in annealed 2205 duplex stainless steel welds [J]. Materials Characterization, 2011, 62(9): 833-843,

[[27]] Hirsch J, Lucke K, Hatherly M. Mechanism of deformation and development of rolling textures in polycrystalline F. C. C. metals. I- Description of rolling texture development in homogeneous Cu−Zn Alloys [J]. Acta Metallurgica, 1988, 36(11): 2905-2927,

[[28]] Ray R K. Rolling textures of pure nickel, nickel-iron and nickel-cobalt alloys [J]. Acta Metallurgica et Materialia, 1995, 43(10): 3861-3872,

[[29]] Vercammen S, Blanpain B, de Cooman B C, et al.. Cold rolling behaviour of an austenitic Fe−30Mn−3Al−3Si TWIP-steel: The importance of deformation twinning [J]. Acta Materialia, 2004, 52(7): 2005-2012,

[[30]] Zhang Y-X, Xu Y-B, Liu H-T, et al.. Microstructure, texture and magnetic properties of strip-cast 1.3% Si non-oriented electrical steels [J]. Journal of Magnetism and Magnetic Materials, 2012, 324(20): 3328-3333,

[[31]] Xu Y B, Zhang Y X, Wang Y, et al.. Evolution of cube texture in strip-cast non-oriented silicon steels [J]. Scripta Materialia, 2014, 87: 17-20,

[[32]] Lehockey E M, Brennenstuhl A M, Thompson I. On the relationship between grain boundary connectivity, coincident site lattice boundaries, and intergranular stress corrosion cracking [J]. Corrosion Science, 2004, 46(10): 2383-2404,

[[33]] Wang K, Jiao X-D, Zhu J-L, et al.. Effect of nitrogen protection on weld metal microstructure and intergranular behavior of S32101 duplex stainless steel 15 m water depth hyperbaric laser underwater welding [J]. Advances in Mechanical Engineering, 2022, 14(1): 168781402110729,

[[34]] Michiuchi M, Kokawa H, Wang Z J, et al.. Twin-induced grain boundary engineering for 316 austenitic stainless steel [J]. Acta Materialia, 2006, 54(19): 5179-5184,

[[35]] Eghlimi A, Shamanian M, Eskandarian M, et al.. Evaluation of microstructure and texture across the welded interface of super duplex stainless steel and high strength low alloy steel [J]. Surface and Coatings Technology, 2015, 264: 150-162,

[[36]] Rault V, Vignal V, Krawiec H, et al.. Quantitative assessment of local misorientations and pitting corrosion behaviour of pearlitic steel using electron backscattered diffraction and microcapillary techniques [J]. Corrosion Science, 2015, 100: 667-671,

[[37]] Randle V. Mechanism of twinning-induced grain boundary engineering in low stacking-fault energy materials [J]. Acta Materialia, 1999, 47(15–16): 4187-4196,

[[38]] Eghlimi A, Shamanian M, Eskandarian M, et al.. Characterization of microstructure and texture across dissimilar super duplex/austenitic stainless steel weldment joint by austenitic filler metal [J]. Materials Characterization, 2015, 106: 208-217,

[[39]] Kobayashi S, Kobayashi R, Watanabe T. Control of grain boundary connectivity based on fractal analysis for improvement of intergranular corrosion resistance in SUS316L austenitic stainless steel [J]. Acta Materialia, 2016, 102: 397-405,