High-temperature strength analysis of welded joint of RAFs by small punch test

Evaluation of local deformation behavior accompanying fatigue damage in F82H welded joint specimens by using digital image correlation

“…In recent years, finite element analysis and other similar methods have been applied to structural design; however, the accurate evaluation of the material properties of each local domain of a joint is difficult, thus making the accurate simulation of an actual joint impossible. A study has been reported in which small specimens were cut out from each local domain of a joint and the joint strength was evaluated [3]; however, mapping the results of this study with those of standard test methods is challenging. In addition, as the specimens collected from a joint are free from constraints and residual stress, the strength properties of the entire welded joint cannot be evaluated by using the test results for each part.…”

Experimental assessment of temperature distribution in heat affected zone (HAZ) in dissimilar joint between 8Cr-2W steel and SUS316L fabricated by 4 kW fiber laser welding

“…Where, the microstructure of HAZ is formed by high temperature, non-equilibrium heat treatment and rapid-quenching due to welding depending on the location away from heat source. In present study, the effect of achieving temperature distribution during welding focused because the microstructure formation mechanism of HAZ is strongly dependent on the temperature (Tanigawa et al (2003), Kato et al (2009)). Therefore, the temperature distribution in laser welding is investigated using annealed specimens in order to better interpret the precipitate stability.…”

Mechanical characterisation of a P91 weldment by means of small punch fracture testing

“…Matocha et al determined the SP transition temperature (T SP ) for a CrMoV alloy from the parent metal and the HAZ but as they sampled the HAZ discs perpendicular to the longitudinal axis rather than at the weld's angle, they could extract only one SP disc from the whole HAZ [14]. Kato et al performed SP fracture tests with TEM type disc specimens at high temperatures, which revealed that a linear correlation could be made between high temperature mechanical properties obtained by SP and conventional tensile tests [15]. Lee's study [16] aimed at the degradation of mechanical properties inside the weldment of a high Cr steel, succeeded in showing the superior strength and ductility properties of Heat Affected Zone-Fine Grained (HAZ-FG) as compared to the other zones by using both conventional SP and modified SP where the puncher and the receiving hole diameter is smaller than for conventional SP.…”