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Effects of Second Thermal Cycles on Microstructure and CO2 Corrosion Behavior of X80 Pipeline Steel

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Figure

Figure 1. Schematic diagrams of the welding thermal cycles for the samples (a) RT+GMAW and (b) SAW+GMAW
Table 1. Specific welding thermal simulation parameters (Tp and E represent the peak temperature and heat input, respectively, in the welding process)
Figure 2. OM images of the microstructure of (a) the BM and (b) the CGHAZ of SAW.
Figure 3.  OM images of the microstructures of the HAZ samples experiencing only the GMAW thermal cycle: (a) SHAZ; (b) ICHAZ; (c) SCHAZ; (d) CGHAZ-1 and (e) CGHAZ-2
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