Abstract
The effect of the minor elements C, B, and P on the weldability of the INCONEL 718 alloy was studied. Wrought alloys containing systematic additions of the three minor elements were evaluated by thermal simulation and by electron-beam welding. The ductility recovery temperature from the thermal simulation experiments and the microfissuring behavior in the heat-affected zone (HAZ) of the electron-beam samples were used to evaluate the effect of minor elements on weldability.
Carbon was found to have minimal effect on weldability, whereas, as previously observed, B has a significant negative impact on weldability. The element P, in combination with B, was extremely detrimental to weldability, but C mitigated the harmful effects of B and P, both individually and in combination. The effect of the minor-element additions has been explained in terms of site competition of segregating species on grain boundaries.
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Benhadad, S., Richards, N.L. & Chaturvedi, M.C. The influence of minor elements on the weldability of an INCONEL 718-type superalloy. Metall Mater Trans A 33, 2005–2017 (2002). https://doi.org/10.1007/s11661-002-0033-5
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DOI: https://doi.org/10.1007/s11661-002-0033-5