Effect of temperature and exploitation time on tensile properties and plain strain fracture toughness, KIc, in a welded joint

Crack Size and Undermatching Effects on Fracture Behavior of a Welded Joint

“…Welded joint heterogeneity has an important role in the behavior of steel welded joints, particularly if crack-like defects are present, causing local plastic strains. Even in the case of filler metal being the same class as the base metal, a welded joint has different tensile properties, toughness, fracture toughness, and fatigue crack growth rate as a consequence of heterogeneous microstructure, at least in four zones of the joint (base metal—BM, weld metal—WM, coarse-grain heat-affected zone—CGHAZ, fine-grain heat-affected zone—FGHAZ), [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 ]. Different tensile properties are analyzed and evaluated in recent papers [ 1 , 2 , 3 ], where the digital image correlation (DIC) technique was used to measure strains, and the finite element method (FEM) was used to calculate stress distribution in specimens with a rectangular cross-section to evaluate true stress–strain curves more precisely.…”

The Effect of Material Heterogeneity and Temperature on Impact Toughness and Fracture Resistance of SA-387 Gr. 91 Welded Joints

“…The approach used in this paper had already been applied in the case of structural, low-alloyed HSLA steel and its welded joint constituents [ 12 ], as well as in a series of papers presenting research on a similar steel, A 387 Gr. B, with 1% Cr, which is also used for elevated temperature [ 13 , 14 , 15 , 16 , 17 , 18 ]. In general, all relevant mechanical properties of steel A 387 Gr.…”

“…In general, all relevant mechanical properties of steel A 387 Gr. B, such as tensile properties, Charpy impact toughness, fracture toughness, and Paris law coefficients, have been presented in series of papers [ 13 , 14 , 15 , 16 , 17 , 18 , 19 ], including the effects of time and temperature. More concretely, the influence of temperature and exploitation period (time) on the behavior of a welded joint subjected to impact loading was analyzed in [ 13 ], while the same effects on plane strain fracture toughness in a welded joint were analyzed in [ 14 ], indicating very good crack resistance properties of all three regions, with small differences between them.…”

“…B welded joint was presented in [ 15 ], where separated energies as obtained using Charpy instrumented pendulum were compared with fracture toughness. The effect of temperature and exploitation time on tensile properties and plane strain fracture toughness in a welded joint was analyzed in [ 16 , 17 ], also indicating the good properties of all three zones, i.e., BM, WM, and HAZ. The influence of temperature and exploitation period on fatigue-crack growth parameters in different regions of welded joints was analyzed in [ 18 ], indicating the highest crack-growth-rate values in HAZ and the lowest in BM.…”

Influence of temperature and exploitation period on fatigue crack growth parameters in different regions of welded joints

“…Long-time, high temperature exploitation of the reactor, caused siginficant damage in reactor mantle, requiring a thorough inspection and repair of damaged parts, including replacement of a part of reactor mantle. For designed exploitation parameters (p=35 bar, t=537 °C), the material is prone to decarbonization, reducing its strength as a consequence, [2]. Testing of high-cycle fatigue behaviour of new and exploited parent metal (PM), weld metal (WM) and heat affected zone (HAZ), at room and service temperature (540 °C) is necessary to get detailed insight in all parameters influencing fatigue crack growth resistance of Welding of both new and exploited PM was performed in two stages, according to the following welding procedure specification:  Root pass by shielded metal arc welding, using LINCOLN S1 19G electrode, and  Filling passes by arc submerged arc welding, using LINCOLN LNS 150 wire and LINCOLN P230 flux.…”