Soochow University, China, successfully demonstrated a novel high alloying element maraging steel (HA-MS1) prepared by laser metal deposition (LMD). Differential scanning calorimetry (DSC) phase transformation analysis on the as-deposited (AF) specimens was conducted and the reasonable aging heat treatment (AT) and solution + aging heat treatment (ST + AT) were subsequently proposed.
These specimens were characterized by scanning electron microscopy (SEM), electron back-scattered diffraction (EBSD), X-ray diffraction (XRD), hardness test, wear test and potentiodynamic polarization test for microstructure, phase, hardness, tribological and corrosive properties. The grain refinement and a large number of Ni3(Ti, Mo) intermetallic compounds in the matrix after AT resulted in superior hardness and wear resistance, while leading to poor corrosion resistance. This phenomenon resulted in a decreasing compatibility of mechanical properties than the AT specimens, but the specimens aged at 490 °C after solution treatment at 820 °C had the best corrosion resistance, mainly due to their good surface and more densification.
https://link.springer.com/article/10.1007/s12540-022-01218-4
