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Mechanism of Localized Corrosion and Phase Transformation of Tube to Tube Sheet Welds of Hyper Duplex Stainless Steel in Acidified Chloride Environments

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Figure

Table 1Chemical composition of high-performance duplex stainless steel and commercial Ni-base filler (mass%).
Fig. 2(a) Calculation of the phase diagram for the HDSS alloy using aThermo-Calc software package, and (b) calculation of the equilibriumfractions of each phase for the HDSS alloy using a Thermo-Calc softwarepackage.
Table 2Chemical composition (mass%) of the interdendritic region (IR),dendritic region (DR) and Mu (®) phase in the weld metal of the HDSStube-to-tube sheet welded with Ar with a filler metal.
Fig. 5TEM analyses of Cr2N precipitated in the weld metal of the HDSS tube-to-tube sheet after welding with pure Ar:20) (a) themorphology of Cr2N observed by a thin film technique, (b) the replica technique, (c) the diffraction pattern and (d) the line analysis of Cradjacent to Cr2N.
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