DOI: 10.18503/1995-2732-2021-19-3-68-74
Abstract
Problem Statement (Relevance). From year to year, the share of additive technologies in production keeps increasing. The highest rate of growth is attributed to the use of wire and arc additive manufacturing for 3D printing as the most feasible and efficient technology. However, the available scientific and practical data are insufficient for its successful use in manufacturing parts operating at low temperatures. In this regard, it is required to carry out a more detailed study of materials produced by 3D printing and intended for operation in the Far North and the Arctic. Equipment and Methods Applied. The specimens from steel grade 07Kh25N13 were produced on the developed stand, implementing wire and arc additive manufacturing for 3D printing; the Charpy impact test method was applied, fractographs were analyzed using a scanning electron microscope. Originality. The authors determined fracture mechanisms at low temperatures applied for the specimens from steel grade 07Kh25N13 made by wire and arc additive manufacturing for 3D printing. The results obtained allow us to understand the behavior of materials and printed objects at low temperatures, which has not received enough attention previously. The authors revealed the relationship between the fractal dimension of the specimen fractures and impact toughness to estimate the effect of temperature on fracture. Result. The studies on the specimens from steel grade 07Kh25N13 showed that the fractures occurred after impact testing had four characteristic zones: crack initiation; propagation of cracks, tightening, and a break zone. A total temperature range under study showed a ductile fracture mechanism; however, with a decrease in test temperature, there is a decrease in plasticity and a decrease in the number of observed zones. The paper describes the relationship between a decrease in the fractal dimension of fracture images and a decrease in impact toughness. Practical Relevance. The results contribute to a more detailed understanding of the fracture mechanisms of the specimens from steel grade 07Kh25N13 produced by wire and arc additive manufacturing for 3D printing and assessment of the behavior of this material at low temperatures. The established relationship between the fractal dimension of the fracture and impact toughness allows us to more clearly establish the temperature reasons for the destruction of structures.
Keywords
Structural steels, 3D printing, wire and arc additive manufacturing, fractographic analysis, fractal dimension, cold resistance.
For citation
Anosov M.S., Kabaldin Yu.G., Kolchin P.V., Shatagin D.A., Chegurov M.K. Electron Microscopy Studies on the Fracture Mechanisms of Structural Steels Fabricated by 3D Printing. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2021, vol. 19, no. 3, pp. 68–74. https://doi.org/10.18503/1995-2732-2021-19-3-68-74
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