Abstract
The structural transformation and mechanical properties of a low-carbon 0.2% C steel and a 0.09% C-Mn-V steel in coarse- and ultrafine-grained (UFG) states were studied. The UFG structure with structural elements about 210-375 nm in size was obtained by rotary swaging (RS) and equal-channel angular pressing (ECAP). ECAP was used to compare the influence of the industrial deformation and SPD methods on the micro structure and properties of low-carbon steels. It was shown that an increase in true strain ratio and a decrease in final temperature of RS improve strength properties and reduce plasticity of these steels. In both steels after RS, σ UTS within the range from 800 up to 920 MPa with elongation in the range of 15-17% at the final deformation temperature of 400 °C was obtained. It was found that the strength of 0.2% C steel after ECAP was on the same level with that steel after RS. The strength properties of low- carbon 0.09% C-Mn-V steel after ECAP were significantly higher than those after RS.
Highlights
Severe plastic deformation (SPD) methods lead to significant refinement of the microstructure and improve the strength and service properties of low-carbon steels [1,2]
It was found that the strength of 0.2% C steel after equal-channel angular pressing (ECAP) was on the same level with that steel after rotary swaging (RS)
The light micrographs of microstructure of the 0.09% C–Mn–V steel after RS are shown in two regimes with a decrease in the deformation temperature in figure 3
Summary
Severe plastic deformation (SPD) methods lead to significant refinement of the microstructure and improve the strength and service properties of low-carbon steels [1,2]. The structural transformation and mechanical properties of a low-carbon 0.2% C steel and a 0.09% C–Mn–V steel in coarse- and ultrafine-grained (UFG) states were studied. ECAP was used to compare the influence of the industrial deformation and SPD methods on the microstructure and properties of low-carbon steels.
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