Abstract
An advanced accident-tolerant FeCrAl alloy, C35鈥疢 (Fe鈥�13Cr鈥�10Al鈥�1Mo, at %), and its laser-fusion weldments were studied after neutron irradiation up to 1.8 dpa at 357鈥癈 to evaluate the radiation damage and 伪鈥�-precipitation kinetics. Results show that the densities of 伪鈥� in the fusion zone (FZ) and the heat-affected zone (HAZ) were only a third of that in the base material, i.e., 2.3鈥椻€�1024鈥痬鈭�3. Density of dislocation loops in the FZ and HAZ were less than half of that in base material. The size of 伪鈥� precipitates and the dislocation loops were found to be smaller in base material, compared to FZ and HAZ. The variances in microstructural response within the different regions were attributed to initial as-welded states of each region, indicating the impact of the pre-irradiation condition on radiation response in FeCrAl alloys.
