بررسی ریزساختار انجمادی سوپرآلیاژ IN۶۲۵ لایه نشانی شده روی IN۷۱۳LC توسط فرایند رسوب نشانی مستقیم لیزری

Inconel ۷۱۳LC super alloy is one of the most widely used high-temperature alloys. Due to the high level of gamma prime phase caused by Ti and Al alloy more than a critical value, this alloy is considered as one of the non-weldable alloys. One of the basic repair methods of this series of superalloys is laser cladding methods. In this research, the IN۷۱۳LC  substrate was reconstructed with Inconel ۶۲۵ powder by a direct laser deposition system. To characterize, optical and electron microscopy tests, porosity measurement, and XRD were carried out; The results showed that the R (growth rate of the dendrite tip) increases at high speeds of laser cladding; as a result, the G/R (combined solidification point) ratio decreases, and the structure tends towards the coaxial dendritic direction. For this reason, by increasing the speed of laser scanning from ۴ to ۶ mm/s, the coaxial dendritic structure increases. The hardness measurement results indicate a decrease in the hardness up to the junction area from ۴۳۰ to ۳۷۰ Vickers and fluctuations of about ۵۰ Vickers. Due to the high solidification speed, the average distance between the secondary dendritic arm space was ۰.۸ at the bottom, ۱.۰۱ in the middle, and ۱.۷۵ micrometers at the top of the sample. Due to the high cooling speed, only carbides and lava phases are formed. Also, the porosity measurement results of the cladding indicate a maximum porosity of ۰.۱ percent.

Keywords:

Weldability , Rebuilding , Inconel ۷۱۳LC , Inconel ۶۲۵ , Direct laser deposition. , جوش پذیری , بازسازی , اینکونل LC ۷۱۳ , اینکونل ۶۲۵ , رسوب نشانی مستقیم لیزری