Abstract
In the work, the results of the research concerned with the TRIP (Transformation Induced Plasticity) steel wire drawing process in experimental and theoretical ways are shown. The wire drawing process tests on the experimental way were conducted in both laboratories as well as industrial conditions, with the use of two drawing speeds (1.6 and 6 m/s) and two drawing schemes (low and high single reductions). The mechanical properties of wires drawn with high drawing speed equal to 6 m/s showed higher values of mechanical properties for wires drawn with low single reductions than for wires drawn with high single reductions. Such a phenomenon contradicts the theory of drawing wires from steel with a ferritic-pearlitic structure and must be related to TRIP structure and the presence of retained austenite in it, which is transformed into martensite during the deformation process. In order to explain this phenomenon, the theoretical wire drawing process analysis was conducted with the use of the Drawing 2D program based on the finite element method. On the base of the simulation, a large increase in temperature was found on the surface for wires drawn with high drawing speed and low single reductions, which can cause the blocking of transformation retained austenite into martensite and thus a decrease in Rm. To confirm this thesis, further studies will include tests of the amount of retained austenite in wires obtained during experimental tests.
Highlights
Significant progress in metallurgical technologies allows the production of different grades of steels from typical ferritic steels to multiphase high-strength steels, which are new materials having high mechanical properties while retaining very good plastic properties
Many publications concerned with the transformation induced plasticity (TRIP) effect, the technology of producing TRIP steel sheet and its applications were found to exist in available literature; there were no publications concerning the technology of producing wire rod of low- and medium-carbon TRIP-structure steels and research on the drawing process and properties of wires of this type of steel
Based on the conducted tests of drawn wire mechanical properties, it was concluded that for a speed of 1.6 m/s, the Rm and R0.2 of wires drawn with high single reductions were higher than these properties in wires drawn with low single reductions
Summary
Significant progress in metallurgical technologies allows the production of different grades of steels from typical ferritic steels to multiphase high-strength steels, which are new materials having high mechanical properties while retaining very good plastic properties. The TRIP steels with high retained austenite content, which undergo martensite transformation gradually, with strain increasing, are characterized by the best mechanical properties. This is the effect of presence in steel structure the mechanical stable retained austenite, which extends the plasticity range of material, and martensite obtained after transformation, influences on the increase of the mechanical properties. In order to explain the atypical phenomenon of the increase in the mechanical properties of drawn wires with low single reductions in relation to wires drawn with high single reductions, a theoretical analysis of the drawing process was carried out
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