Anisotropic Fracture Toughness of a Selective Laser Melted Martensitic Stainless Steel
Engineering fracture mechanics(2023)
摘要
Anisotropic fracture toughness of selective laser melted AISI 420 built in two build directions was investigated. Post-process heat treatments were performed at 200 degrees C and 400 degrees C to study the tempering effect. The parallel group exhibited better fracture toughness than the perpendicular group in both as-built and tempered states. KIC value of the 400 degrees C tempered state was superior to that of other states due to a coarser martensite phase. Elongated cellular structure was responsible for the anisotropic behavior because of a build direction effect, while the anisotropy was barely changed by the tempering treatments.
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关键词
Anisotropy,Fracture toughness,Selective laser melting,Tempering treatment,Elongated cellular structure
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