Effects of Nb on the microstructure and corrosive property in the Alloy 690–SUS 304L weldment

Effects of Boron on the Microstructure, Ductility-dip-cracking, and Tensile Properties for NiCrFe-7 Weld Metal

“…Filler metal composition, such as S, P, H, C, Ti, Ta, Mo, La, Ce, and Nb, has a strong effect on DDC formation in austenitic weldments. Segregation of S, P, and H to GBs is a dominant factor for DDC aggravation in Ni-base alloys, whereas Ti, Ta, Mo, La, Ce, and Nb addition to a filler metal reduces the sensitivity of DDC [13,17,20,[27][28][29][30][31] .…”

Hot deformation and processing maps of Inconel 690 superalloy

“…It is used as combustion systems, turbines and the nuclear reactors. The components in these applications are subjected to a complex combination of elevated temperatures, high stress, and hostile environmental conditions [1][2][3]. For this superalloy, controlling the hot working process to obtain a uniform microstructure seems to be very important [4].…”

Effects of beam offset on mechanical properties and corrosion resistance of Alloy 690–SUS 304L EBW joints for nuclear power plant

“…However, the increased heat input into the weldment as a result of the higher number of welding passes prompts carbide precipitation at the grain boundaries and leads to the formation of chromium depletion zones in the FZ. As a result, the corrosion resistance of the weldment is significantly impaired [6][7][8][9][10][11][12][13][14].…”

“…The corrosion resistance of nickel-based Alloy 690 is known to be significantly better than that of SUS 304L SS [8,[11][12][13]. Furthermore, shifting the centerline of the electron beam toward the Alloy 690 BM during the EBW fabrication of Alloy 690-SUS 304L SS dissimilar joints yields a considerable improvement in the corrosion resistance of the weldment since it increases the amount of Ni and Cr in the FZ.…”