Abstract
In this paper an exhaustive scientific work is performed, by means of metallographic and scanning electron microscope (SEM) techniques, of the microstructural defects exhibited by pearlitic steels and their evolution with the manufacturing process by cold drawing, analyzing the consequences of such defects on the isotropic/anisotropic fracture behavior of the different steels. Thus, the objective is the establishment of a relation between the microstructural damage and the fracture behavior of the different steels. To this end, samples were taken from all the intermediate stages of the real cold drawing process, from the initial hot rolled bar (not cold drawn at all) to the heavily drawn final commercial product (prestressing steel wire). Results show the very relevant role of non-metallic inclusions in the fracture behavior of cold drawn pearlitic steels.
Highlights
The microstructural evolution with cold drawing has been extensively studied in the past [19,20,21,22,23,24,25,26,27], showing progressive microstructural orientation and increase of packing closeness associated with a decrease of interlamellar spacing and an orientation of the plates in the cold drawing direction [22,23,24,25]
The samples used in the mechanical tests were eutectoid steel wires with differentfrom level the ini levelofofcold cold drawing, level drawing, from the initi of cold drawing, from the initial hot hot rolled bar to the final commercial product thecommercial final commercial product (prestressing ste rolledbar bar (not thetofinal product, drawn), allofofthem themcorresponding correspondingtotoreal real manufacturingchains, chains,a wire; heavily cold drawn), all of all them corresponding to real manufacturingmanufacturing chains, as shown in shown
The samples were mounted in resin for grinding and polishing up materials to mirror. They were chemically attacked to reveal the microstructure of the they were chemically attacked to reveal the microstructure of the materials sively cold drawn pearlitic steel wires) and to observe it by scanning electron microscopy (progressively cold drawn pearlitic steel to observe by produced scanning electron (SEM) using a JEOL
Summary
High-strength cold-drawn eutectoid steel wires are important components in structural engineering [1,2,3,4,5,6]. Thispaper paperfocuses focuseson onthe therole roleofofinclusions inclusions(analyzed This therised mechanical performance (evaluated bymeans means standard tension tests) co steel [48], performance influence of inclusions on the mechanical properties [49] ortension their effect on ofofcol ininthe mechanical (evaluated by ofofstandard tests) deformation and fracture drawn pearliticsteel steel withdifferent differentdegree degreeofofcold colddrawing drawingand anddistinct distinctchemical chemicalcom co drawn pearlitic with. (created bythe the presence inclusions) andthe thefracture fracture behavior cold drawn pearl. Theby aim of the paper is of toof find a possibleand relationship (in the sense of materials science and pearlit (created presence inclusions) behavior ofofcold drawn steelsduring duringtensile tensile testing. The presence of inclusions) and the fracture behavior of cold drawn pearlitic steels during tensile testing
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