Abstract
In this study, a Ni-reduced austenitic stainless TRIP/TWIP steel with < 5 vol.% δ-ferrite was investigated before and after plasma arc welding and gas tungsten arc welding. The 4-mm-thick hot-rolled sheet was produced as hot-rolled heavy plate on an industrial scale and manufactured as longitudinally welded pipes without filler metal. Microstructural characterization was done using light optical microscope and scanning electron microscope with electron backscatter diffraction (EBSD). The microstructure consisted of non-recrystallized austenite with a small amount of δ-ferrite. The welds exhibited skeletal and lacy δ-ferrite morphologies. ε-martensite and α´-martensite were found in the weld seam after pipe expansion. Further, the mechanical properties were evaluated using tensile test. The results showed a tensile strength of 823 MPa with a uniform elongation of 69% at room temperature. The change of hardness in the weld seam was studied for welded pipe, welded expanded pipe and welded, post-weld heat-treated (PWHT) pipe with Vickers hardness testing. The lowest hardness was achieved after PWHT. The corrosion resistance tests were conducted in chloride containing environment. The results showed that the susceptibility to pitting corrosion increased with the degree of deformation. Furthermore, the weld metal and heat-affected zone exhibited local attack whereas the base metal seemed unaffected.
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Acknowledgments
The authors thank the German Research Foundation (DFG) for the financial support of this work. This work was carried out within the framework of the Collaborative Research Center 799 (grant number 54473466), transfer project T5. The authors thank Dr.-Ing. Michael Hauser from Institute of Iron and Steel Technology, TU Bergakademie Freiberg for the thermodynamic calculations with the Thermo-Calc software. The authors thank also Dipl.-Ing. Frank Hoffmann from Institute of Metal Forming, TU Bergakademie Freiberg for hot rolling the bars.
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CQ and CH contributed to investigation, visualization and writing—original draft. CS contributed to conceptualization, methodology and writing—review. CS contributed to investigation, formal analysis, visualization and writing—review. BA contributed to investigation and writing—review. SH contributed to validation, writing—review and project administration. MM contributed to writing—review and validation. LK contributed to validation, project administration and writing—review. OV contributed to validation, writing—review and project administration. MW contributed to writing—review, supervision, validation and project administration.
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Quitzke, C., Hempel, C., Schröder, C. et al. Manufacturing and Characterization of Plasma Gas Tungsten Arc-Welded Pipes Made of a Ni-Reduced Austenitic Stainless CrMnNi Steel. J. of Materi Eng and Perform 32, 7915–7927 (2023). https://doi.org/10.1007/s11665-022-07676-6
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DOI: https://doi.org/10.1007/s11665-022-07676-6