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Effect of Trace Element on Microstructure and Fracture Toughness of Weld Metal

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

The microstructure and fracture toughness of weld metal under Ti-free and Ti-containing different fluxes were investigated in this study. It was found that the trace element Ti of flux in submerged arc welding produced significant influence on the fracture toughness. The addition of 60 ppm Ti induced the sharp increase in J0.2 value from 232.78 to 364.08 kJ/m2. Microstructure characterization revealed that a large number of oxide inclusions prompted the nucleation of acicular ferrites and refined grains, which improved the fracture toughness of Ti-containing weld metal greatly. Moreover, the crack propagation path was more tortuous and bifurcated due to the small amount of carbide precipitations along grain boundaries and blocky martensite–austenite islands for Ti-containing weld metal. Meanwhile, the large-angle grain boundaries caused crack deflection and increased the resistance of crack propagation compared to Ti-free weld metal.

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Acknowledgements

The authors gratefully acknowledge the financial support by the National Natural Science Foundation of China (Nos. 51675336 and U1660101) and the experimental supports by the Instrumental Analysis Center of Shanghai Jiao Tong University (SJTU).

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Correspondence to Haichao Cui or Fenggui Lu.

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Available online at http://link.springer.com/journal/40195.

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Xu, K., Fang, T., Zhao, L. et al. Effect of Trace Element on Microstructure and Fracture Toughness of Weld Metal. Acta Metall. Sin. (Engl. Lett.) 33, 425–436 (2020). https://doi.org/10.1007/s40195-019-00978-0

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  • DOI: https://doi.org/10.1007/s40195-019-00978-0

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