Optics

Physics

Internal medicine

Composite material

Organic chemistry

Chemistry

Metallurgy

Materials science

Welding

Superalloy

Selective laser melting

Shock (circulatory)

Residual stress

Phase (matter)

Laser

Mechanics

Cracking

Shock wave

Medicine

Laser peening

Peening

Microstructure

Additive manufacturing

Selective Laser Melting (SLM) of Ni-based superalloys such as CM247LC is prone to weld-cracking. This paper investigates how to suppress cracks by repeatedly applying Laser Shock Peening (LSP) during the building phase of SLM. Samples made of CM247LC were processed with different LSP parameters, and the influence on bulk crack density has been quantified. It was observed that for all chosen conditions, a significant decrease of up to 95% could be achieved, demonstrating the potential of the new hybrid 3D LSP method in improving SLM processability of alloys sensitive to cracking.

Healing cracks in selective laser melting by 3D laser shock peening