Abstract
In this research, solidification crack behavior in the laser cladding of Amdry 997 on Inconel 713 LC superalloy was investigated. This study aims to reveal the relation between laser parameters (laser scanning speed, pulse width, and laser frequency) and cracking phenomenon and finally, achieve a free-crack clad region. It is found that the dilution ratio has a substantial effect on the cracking phenomenon. Clad zones with large diluted area experience longer cracks due to intensive thermal stress applied in two dimensions, whereas the severity and length of cracks decrease by dropping the dilution ratio. Solidification crack is dominant in this study and mostly happens in the middle area of the clad zone, where thicker liquid films of β-NiAl phase and M(Mo, Ta)C carbides are formed between the coarser dendrites of γ. Laser scanning speed of 140 mm/min, pulse width of 7.5 ms, and laser frequency of 16 Hz result in the minimum dilution ratio (28%) and free-crack clad zone.
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