Abstract
As a kind of important material, steel plays an important role in many industries. In this paper, the tensile fracture surface of 17mm diameter 60 steel wire (heat treatment) was analyzed. Through the analysis, it is found that the fracture surface is consist of three parts, including smooth plane surface, large plane surface and a small plane surface. The tensile strength of the steel wire is related to its brittleness and impact properties, which can be evaluated by the analysis of the fracture surface.
1 Introduction
Steel is a kind of important material, which is widely used in many industries, such as machinery manufacturing, automobile industry, metal construction, construction industry and other fields. In many industrial production fields, good mechanical properties are the basis of steel application, and steel wire is a kind of common metal wire. The tensile fracture characteristics of steel wire are closely related to its brittleness and impact properties.
2 Materials and Methods
The sample is 17mm diameter 60 steel wire (heat treatment), with a length of 200 mm. The sample was broken at room temperature under room temperature testing conditions. The fracture surface of the sample was observed and photographed by scanning electron microscope (SEM).
3 Results and Discussion
The fracture surface of the sample is consist of three parts, including smooth plane surface, large plane surface and a small plane surface. On the smooth plane surface, there are a lot of small indentations and protrusions, and the large plane surface is covered with glittering particles. At the lower center, there is a large obvious dimple, while the small plane surface shows mainly small-scale grooves and gullies with few particles on the surface.
The dimple on the fracture surface has a rough edge and a dent in lay. The dimple edges are quite sharp and serrated, which indicates local brittle fracture of the steel wire. The smooth plane surface shows repeating small indentation and protrusion which indicates plastic deformation, while the large plane surface is covered with glittering particles which suggests ductile tensile fracture.
4 Conclusion
The analysis of the fracture surface of 17mm diameter 60 steel wire (heat treatment) revealed three parts including smooth plane surface, large plane surface and a small plane surface. The dimple edge is sharp and serrated, which indicates local brittle fracture, while the smooth plane surface shows repeating small indentation and protrusion which suggests plastic deformation, and the large plane surface is covered with glittering particles which also suggests ductile tensile fracture. The tensile strength of the steel wire can be evaluated from the analysis of the fracture surface.
References
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[2] E. Martin, P. Koopman, and R. Toe, Dimple formation and EDX-analysis of fracture surfaces obtained by tensile tests, Materials Science & Engineering A, vol. 195, nos. 1-2, pp. 45-50, 1995.
[3] M. Berthold, H. Bartz, W. Biedermann, and K. Baden, Ductile and brittle behavior in tensile tests of type 316 stainless steel, Fatigue & Fracture of Engineering Materials & Structures, vol. 15, no. 1, pp. 3-9, 1991.
