Enhanced cooling rates in laser directed energy deposition with interlayer peening

Purpose This study aims to investigate the effect of mechanical peening on cooling rate a subsequently deposited layer in hybrid additive manufacturing (AM) process. Design/methodology/approach In this experimental study, 20 layers 316 L stainless steel are built via directed energy deposition, with tenth being subject various processes (shot peening, hammer and laser shock peening). The microstructure eleventh all samples is then characterized estimate rate. Findings measurements indicate that application interlayer causes reduction primary cellular arm spacing an increase micro segregation as compared sample prepared without peening. Both factors brought about by Practical implications work provides insight into process design for AM rates known influence properties laser-based AM. Originality/value To best authors’ knowledge, first its kind evaluate effects