Abstract
60NiTi alloy has become a competitive candidate for bearing applications due to its shape memory effect, superelasticity, high strength, hardness, excellent abrasion resistance and corrosion resistance, etc. However, the relationship between its corrosion resistance and heat treatment is not clearly understood. Therefore, we used OM, XRD, SEM and EDS to study the evolution of microstructure in as-cast, solution-treated and aged 60NiTi alloy. Besides, the potentiodynamic polarization and salt spray test were used to compare corrosion resistance of 60NiTi alloy and 316 stainless steel and to study the effect of microstructures on corrosion resistance of 60NiTi alloy. The results show that the corrosion resistance of as-cast 60NiTi alloy is comparable to that of 316 stainless steel, but the corrosion resistance of solution-treated and aged 60NiTi alloys is much superior. The significantly reduced Ni3Ti phase after the solution and aging treatments is responsible for the remarkable improvement in the corrosion resistance of as-cast 60NiTi alloy.
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The work was supported by the National Natural Science Foundation of China (No. 51171123 and 51271128).
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Qin, Q., Wen, Y., Wang, G. et al. Effects of Solution and Aging Treatments on Corrosion Resistance of As-cast 60NiTi Alloy. J. of Materi Eng and Perform 25, 5167–5172 (2016). https://doi.org/10.1007/s11665-016-2402-z
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DOI: https://doi.org/10.1007/s11665-016-2402-z