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

摘要

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 degrees C, 200 degrees C, 400 degrees C, 600 degrees C, and 800 degrees 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 degrees 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.