Investigation into High-Temperature Interfacial Strength of Heat-Resisting Alloy Deposited by Laser Melting Process

This paper presents an investigation of the interfacial strength between a material deposited on a substrate via direct energy deposition (DED) process. Using the DED process, a powder of the hot work tool steel H13 was deposited onto a substrate of SKD61 steel, and shear tests were performed at various temperatures (25 °C, 200 °C, 400 °C, 600 °C, and 800 °C) to investigate the strength of the interface between the deposited material and the substrate. After the shear test, the fractured specimens were also analyzed. As a tested result at room temperature (25 °C), the cracks in the specimen were initiated in the deposited region; however, at high temperatures, the specimens were fractured only in the substrate regions. However, despite the difference in the location of the fracture-containing region, at no test temperature did interfacial cracking or delamination occur between the deposited material and the substrate. Thus, the interface demonstrated high bonding strength.