Effects of surface thermal spray coating on mechanical properties of STD11 steel

This study aimed to increase wear resistance by forming a thermal spray coating layer on the steel surface using a high-hardness coating material. After quenching at 1030°C and low-temperature tempering at 170°C on the existing STD11 steel, HVOF thermal spray of WC-12Co powder, surface fusing treatment using 60W-40Ni self-fluxing alloy powder, and arc wire thermal spray using Fe-29%Cr wire were performed to form a high-hardness coating layer on the surface of the STD11 steel. The surface of the manufactured sample was measured five times using a Vickers hardness (HV) tester, and the HVOF thermal spray was measured to be HRC70.6, the fusing thermal spray HRC64.2, and the arc wire thermal spray HRC62.9. The cross-section of each thermal spray coating layer was analyzed by SEM-EDX (Scanning Electron Microscopy-Energy Dispersive X-ray Analysis).