Effects of Scan Speed on Crack Elimination, Microstructural Evolution, and Mechanical Properties of IN738LC Alloy Processed by Laser Powder Bed Fusion
Pengju Wang·Di Wang·Linqing Liu·Yang Wei·Wenqing Yang·Yang Li·Changjun Han·Xie Yang·Hua Tan·Leilei Wang·Yongqiang Yang·Jingguang Du
Cracking represents a critical issue in γ’-strengthened Ni-based superalloys processed via laser powder bed fusion. This study systematically investigated the influence of scan speed (800–1200 mm/s) on the crack elimination mechanism, microstructural evolution, and mechanical properties of LPBF-processed IN738LC alloy. Near-defect-free IN738LC parts were successfully produced with a relative density of 99.6% and a crack density of only 0.025%. The results indicate that as the scan speed increase