Effect of Trace Element on Microstructure and Fracture Toughness of Weld Metal
作者： Ke Xu , Tao Fang , Longfei Zhao , Haichao Cui , Fenggui Lu
DOI: 10.1007/S40195-019-00978-0
关键词: Composite material 、 Microstructure 、 Acicular 、 Fracture mechanics 、 Grain boundary 、 Materials science 、 Fracture toughness 、 Submerged arc welding 、 Carbide 、 Nucleation
摘要: The microstructure and fracture toughness of weld metal under Ti-free Ti-containing different fluxes were investigated in this study. It was found that the trace element Ti flux submerged arc welding produced significant influence on toughness. addition 60 ppm induced sharp increase J0.2 value from 232.78 to 364.08 kJ/m2. Microstructure characterization revealed a large number oxide inclusions prompted nucleation acicular ferrites refined grains, which improved greatly. Moreover, crack propagation path more tortuous bifurcated due small amount carbide precipitations along grain boundaries blocky martensite–austenite islands for metal. Meanwhile, large-angle caused deflection increased resistance compared
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