Effect of Laser Scanning Speed on Tensile and Fatigue Behavior of LPBF‐Printed Co‐Cr‐Mo Alloy

ABSTRACT Laser powder bed fusion (LPBF)–printed Co‐Cr‐Mo alloy is widely used in biomedical implants and aerospace parts. In LPBF, scanning speed is crucial for melt pool formation and defect prevention, which in turn affects the fatigue behavior of the material. The present study investigates the influence of scanning speeds (600, 750, and 900 mm/s) on the fatigue properties of LPBF Co‐Cr‐Mo alloy. High‐cycle fatigue (HCF) tests were performed to determine the maximum stress at which run‐out occurred for each scanning speed. The failure mechanisms in fatigue specimens were explored through field emission scanning electron microscopy. Furthermore, microstructural analysis of fatigue fracture specimens was carried out using transmission electron microscopy. This study demonstrates that scanning speed influences the tensile and HCF performance of LPBF Co‐Cr‐Mo alloy. The findings of this study will aid in selecting LPBF scanning speeds for Co‐Cr‐Mo alloy to minimize defects and achieve the desired fatigue properties for medical and aerospace applications.