Characteristics relevant to ductile failure of bimetallic welds and evaluation of transferability of fracture properties

Local fracture resistance behavior of interface regions in a dissimilar metal welded joint

“…[9][10][11] with that of the A508/Alloy52Mb interface region (Figs. [5][6][7][8], it is interesting to note that the two interface cracks both have the lowest fracture resistance, and when the cracks are located in hard materials of interface regions, the material constraint effect can reduce cracktip plastic strain and stress triaxiality and has beneficial effect on local fracture resistance; while the cracks are located in soft materials, it can increase crack-tip plastic strain and stress triaxiality and has detrimental effect on local fracture resistance.…”

“…However, due to the highly inhomogeneous microstructure, mechanical and fracture properties across the DMWJ, it is difficult to conduct analytical or experimental fracture investigations on the DMWJs. Only limited studies on the fracture behavior for the DMWJ can be found in the literature [5][6][7][8][9][10][11][12][13]. A series of fracture tests have been performed to evaluate the fracture resistance of DMWJ between SA508 ferritic steel and 304L stainless steel (SS) using E308L SS as a filler metal in the BiMET and ADIMEW programs within the European Commission [5][6][7].…”

“…The local fracture resistance of weld joints between SA508 ferritic steel and F316 SS using Alloy82/182 as a filler metal have been evaluated at room temperature (RT) [8][9][10]. Laukkanen et al [11] conducted an investigation using Charpy-size three point bend (3PB) specimens on the fracture behavior for various regions of SA508/ AISI304 DMWJ. Samal [12,13].…”

Local mechanical properties of Alloy 82/182 dissimilar weld joint between SA508 Gr.1a and F316 SS at RT and 320°C

“…This has been known to be caused by high residual stress, which is induced by the microstructural heterogeneity and resulting gradient of mechanical properties across the DMW joint. The significant gradient of mechanical properties also produces difficulties in the integrity assessments of the welded components because the stress distribution and crack behavior in the weld joints are strongly dependent on the heterogeneity of mechanical properties [5,6]. Therefore, it is important to further clarify the local distribution of mechanical properties in the weld region for a reliable integrity assessment of the DMW components.…”

“…Several studies have attempted to evaluate the local mechanical properties in DMW joints [1,[6][7][8][9][10]. Sireesha et al [1] performed hardness and tensile tests on weldments with Alloys 82 and 182 to select an appropriate filler metal between Alloy 800 and 316LN SS.…”