Reduction of the hot cracking sensitivity of CM-247LC superalloy processed by laser cladding using induction preheating
Article dans une revue avec comité de lecture
Date
2020Journal
Journal of Materials Processing TechnologyRésumé
In the present work, the repair of CM-247LC superalloy has been investigated by using a laser cladding process. Since this material is well known for its high hot-cracking susceptibility in Heat Affected Zone during welding, repairing is quite challenging. In a first stage, a detailed investigation of the effect of cladding parameters on the crack susceptibility was carried out on coupons that received a low pre-heating condition. However, despite a reduction of crack sensitivity for low energy inputs, this material has systematically shown some evidence of cracking in the HAZ. In a second stage, attempts were made to reduce crack defects by using an induction preheating, with higher temperatures in the range of 800–1100 °C. With the highest pre-heating temperatures near 1100 °C, the partial dissolution of large γ’ precipitates, combined with re-precipitation of secondary and smaller γ' precipitates were helpful to prevent hot cracking.
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