Characterization of microstructure of A508III/309L/308L weld and oxide films formed in deaerated high-temperature water

Study on Microelectrochemical Inhomogeneity of an SA508–309L/308L Overlay Welded Joint

“…These changes in the microstructure are in line with the findings of earlier investigations, as reported in studies. 4,12,28 The heat-affected zone (HAZ) of SA508, as depicted in Figure 1a, exhibits a complex microstructure evolution and can be segmented into four regions, namely, coarse-grained HAZ (CGHAZ), fine-grained HAZ (FGHAZ), intercritical HAZ (ICHAZ), and subcritical HAZ (SCHAZ). 49,50 The FGHAZ, in particular, can be subdivided into FGHAZ1 and FGHAZ2, taking into account their distinct microstructural characteristics, as shown in Figure 1i,j.…”

“…This dissimilar metal welded joint (DMWJ) can be regarded as a “natural material chip” due to the significant chemical and structural distinctions, highlighting its material inhomogeneity . In previous studies, − complex microstructure evolution of the SA508–309 L /308L DMWJ has been elaborated. Around the fusion boundary of DMWJ, the heterogeneous distribution of elements, microstructure, and residual stress has a detrimental effect on its mechanical properties − and corrosion resistance. − Although there have been many studies conducted on the mechanical properties of DMWJ, ,,− its corrosion behavior has not been explored as extensively. − It is unfortunate that the microelectrochemistry of different subregions in heat-affected zones (HAZs) has not been examined in an SA508–309 L /308L DMWJ, which would aid in comprehending its intricate corrosion behavior such as microgalvanic corrosion.…”

High-Temperature Oxidation Behavior and Related Mechanism of RuT400 Vermicular Graphite Iron

“…During the oxidation process, the vermicular graphite mainly diffuses along the pearlite adjacent to it, while Fig. 11 Vermicular graphite before and after oxidation: a original; b, c, d oxidation for 500 h the diffusion along the ferrite is limited, which to a certain extent shows that ferrite has better oxidation resistance than pearlite [30][31][32]. Pearlite "burned" during the oxidation process is an important reason for the decline in its proportion.…”

Effects of surface treatments and temperature on the oxidation behavior of 308L stainless steel cladding in hydrogenated high-temperature water

“…Austenitic stainless steel (ASS) welds are widely applied as critical components in many industries attributed to the weld metals containing austenite and ferrite phases, and the wellcontrol duplex structure is generally considered to be against corrosion and mitigate stress corrosion cracking (SCC) [1][2][3][4][5]. The main parameters that influence oxidation and SCC performance of austenitic alloy were identified as material and water chemistry [6][7][8], the type of loading [6,7,9], experiment temperature [9][10][11][12], and surface state [13][14][15][16].…”