Effect of metallurgical evolution during post-weld aging treatment on localised corrosion of resistance spot welding joints of A286 superalloy |
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Authors: | Pilar De Tiedra Manuel San-Juan |
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Affiliation: | 1. Ciencia de los Materiales e Ingeniería Metalúrgica, Departamento CMeIM/EGI/ICGF/IM/IPF, Universidad de Valladolid, Valladolid, Spain;2. Ingeniería de los Procesos de Fabricación, Departamento CMeIM/EGI/ICGF/IM/IPF, Universidad de Valladolid, Valladolid, Spain |
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Abstract: | The combined effect of resistance spot welding and precipitation hardening on the localised corrosion of A286 superalloy is studied. The specimens tested by double loop electrochemical potentiokinetic reactivation were welded in the solution treated condition, and then subjected to different precipitation hardening treatments. For both base metal and weld nugget, the maximum localised corrosion is reached when η phase is clearly observable. The fact that the localised corrosion resistance of weld nugget is different from that shown by base metal may be explained by the segregation of Ni and Ti towards the interdendritic region of weld nugget (studied by using scanning electron microscope/energy dispersive X-ray analysis). |
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Keywords: | Resistance spot welding A286 superalloy precipitation hardening gamma prime phase eta phase DLEPR SEM fusion zone |
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