CAJ | 학술논문

采用钨极氩弧焊(GTAW)技术,采用ERNiCr-3和ERNiCrMo-3两种镍基焊丝实施T92/Super304H异种钢焊接,并对接头的显微组织结构及力学性能进行测试分析.结果表明:T92侧热影响区(HAZ)中粗晶区析出大量的第二相颗粒,细晶区则为细小的索氏体组织;Super304H侧 HAZ奥氏体晶粒长大,晶界析出明显;ERNiCr-3焊接的焊缝组织呈胞状结构,晶粒粗大;ERNiCrMo-3焊接的焊缝组织呈柱状晶组织特征.ERNiCrMo-3焊接的接头强度、塑性及硬度较大,拉伸断裂位于Super304H母材;而ERNiCr-3焊接的接头强度、硬度较低,但冲击韧性较高,拉伸断裂位于焊缝.
채용오겁아호한(GTAW)기술,채용ERNiCr-3화ERNiCrMo-3량충얼기한사실시T92/Super304H이충강한접,병대접두적현미조직결구급역학성능진행측시분석.결과표명:T92측열영향구(HAZ)중조정구석출대량적제이상과립,세정구칙위세소적색씨체조직;Super304H측 HAZ오씨체정립장대,정계석출명현;ERNiCr-3한접적한봉조직정포상결구,정립조대;ERNiCrMo-3한접적한봉조직정주상정조직특정.ERNiCrMo-3한접적접두강도、소성급경도교대,랍신단렬위우Super304H모재;이ERNiCr-3한접적접두강도、경도교저,단충격인성교고,랍신단렬위우한봉.
@@@@T92/Super304H dissimilar steel joints were produced through gas tungsten arc welding (GTAW) technique, using two Ni-based welding wires of ERNiCr-3 and ERNiCrMo-3, respectively. The microstructures and mechanical properties of the joints were then studied. The results show that in the heat-affected zone (HAZ) of the T92 side, lots of second-phase particles precipitate along the grain boundaries and inside the grains of the prior austenites. The fine grain zone of the T92 side HAZ is of a sorbite structure. In the Super304H side HAZ, the austenitic grains grow up rapidly with lots of precipitates along the grain boundaries. The ERNiCr-3 welding seam in the joint is of a coarse cellular structure. Comparatively, the ERNiCrMo-3 welding seam is of dense columnar grains. The ERNiCrMo-3 welded joints have higher strength, ductility and hardness, however, the ERNiCr-3 welded joints have a higher impact toughness value. Moreover, the tensile fracture of the formers takes place in the Super304H base metal, while that of the latters happens in the welding seam.