All metals and alloys with exception of Bi are shrinking during cooling, mostly during the solidification process. In order to avoid shrinking porosity, casting process, and gating and feeding system must be properly designed. Solidification front must move towards the feeding system where solidification is then completed. No separate liquid pockets where solidification ended without feeding sh...

New grades of ?/?? nickel-based superalloy for the additive manufacturing process are designed using computational approaches. Account is taken need to avoid defect formation via solidification and solid-state cracking. Processing trials carried out powder-based selective laser melting, comparing with heritage alloys IN939 CM247LC. Microstructural characterisation, calorimetry hot tensile testi...

A cold work tool steel with varied number of layers was deposited on a substrate hot for hard-facing by directed energy deposition technique. This study deals the defects and microstructure in as-cladded steels. Defects, including pores cracks, were found zone, which increased building height or deposited. Large irregular mainly located at lower regions layers. The formation this type attribute...

Laser powder bed fusion (L-PBF) is a versatile additive manufacturing process that can print geometrically complex metal parts for variety of applications. However, poor control defect formation during processing hampers its widespread industrial adoption. Many materials suffer from high crack susceptibility L-PBF, which results in degraded mechanical properties, and an obstacle to the certific...

Abstract Numerous challenges persist with the additive manufacturing of high γ ′ containing Ni-based superalloys such as CM247LC. Currently, significant cracking occurs during deposition CM247LC components using laser powder bed fusion and post-processing. Whilst post-deposition procedures seek to eliminate or minimise cracks, current do not produce a microstructure suitable for service. This s...