Finding
The results show that the welding seam in the T92/HR3C dissimilar steel welding joints is composed of the Ni-based dendritic cellular structure.
Paper
Microstructure and mechanical properties of T92/HR3C dissimilar steel welding joints
Abstract
T92/HR3C dissimilar steel welding joints were produced by gas tungsten arc welding(GTAW) using two Ni-based welding wires of ERNiCr-3 and ERNiCrMo-3,respectively.Microstructure and mechanical properties of the T92/HR3C dissimilar steel welding joints were studied.Effects of post-weld heat-treatment on microstructure and mechanical properties of the joints were also investigated.The results show that the welding seam in the T92/HR3C dissimilar steel welding joints is composed of the Ni-based dendritic cellular structure.The T92 heat effected zone(HAZ) mainly consists of the superheated zone,coarse grain zone and fine grain zone.The grain growth of the HAZ of HR3C steel is not remarkable,however,the cabrides and/or nitrides is detected,precipitating along grain boundaries and inside the grains.The ERNiCrMo-3 welded joints are of higher tensile strength,plasticity and hardness,however,lower impact toughness compared with the ERNiCr-3 welded ones.Under tensile stress,the fracture of the joints takes place at the base metals for the ERNiCrMo-3 welded joints,but at the welding seam for the ERNiCr-3 welded joints.Post-weld heat-treatment can improve mechanical properties of the two T92/HR3C dissimilar steel welding joints.
Authors
Tang Wen-ming
Journal
Transactions of Materials and Heat Treatment