Abstract
The microstructure, martensitic transformation behavior and mechanical properties of the Ti44Ni47Nb9 electron beam welding joints were systemically studied in this research. The results showed that the microstructure of the fusion zone was composed of equiaxed grains with a small quantity of eutectic structure around the grain boundaries, and the grain size in the fusion zone was smaller than that in the as-cast microstructure. The ultimate tensile strength was a little lower than that of the base. The dissolution of niobium in the matrix obstructed the martensite transformation and decreased the martensite start temperature (Ms). After being deformed at the low temperature, the welding joints exhibited good wide transformation hysteresis, which was similar to that of the base metal.
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Acknowledgements
The authors gratefully acknowledge the financial support for this research provided by the National Natural Science Foundation of China (Grant No. 51001100).
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© 2018 The Minerals, Metals & Materials Society
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Yang, D., Jiang, H., Zhao, M., Rong, L. (2018). Microstructure and Mechanical Behaviors of Electron Beam Welded Ti44Ni47Nb9 Shape Memory Alloys. In: Stebner, A., Olson, G. (eds) Proceedings of the International Conference on Martensitic Transformations: Chicago. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-76968-4_35
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DOI: https://doi.org/10.1007/978-3-319-76968-4_35
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