Investigation of tensile fracture mechanism of Fe-based coatings deposited on different substrates by arc spraying

The adhesion strength of the coating to the substrate determines the service life and performance of components coated by thermal spraying. FeCrMoCBWNb coatings were deposited via arc spraying process to study the adhesion properties of the coatings on Q235 and 65Mn steel substrates. The adhesion properties and tensile fracture mechanisms of the coatings on different substrates were examined by the tensile bonding strength. The phase intensity and crystallinity of the coatings were studied by X-ray diffractometer (XRD). The microstructure and mechanical properties of the coatings were also characterized. The adhesion properties of the coatings depended on the substrates' mechanical properties. The tensile bonding strengths of the coating on Q235 and on 65Mn were 45.5 +/- 5.4 MPa and 40.8 +/- 1.4 MPa, respectively. The higher substrate roughness of the Q235 steel enhanced the mechanical interlocking of the coating particles to the substrate. The tensile fracture of the coatings comprised brittle and ductile fracture mechanisms.

Automated summary

The adhesion properties of FeCrMoCBWNb coatings on Q235 and 65Mn steel substrates were investigated. It was found that the mechanical properties of the substrates played a significant role in determining the adhesion properties of the coatings. Higher substrate roughness enhanced the mechanical interlocking between the coating particles and the substrate.