Microstructure and Crystallographic Texture Changes under Torsion Loading of Pearlitic Steel Strips
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Microstructure and Crystallographic Texture Changes under Torsion Loading of Pearlitic Steel Strips Mohammad Masoumi
, Miloslav Be´resˇ, Luis Flavio Gaspar Herculano, Rodrigo de Carvalho Paes Loureiro, and Hamilton Ferreira Gomes de Abreu Submitted: 2 July 2020 / Revised: 18 September 2020 / Accepted: 10 October 2020
Cold-drawn pearlitic steel strips exhibit a great combination of strength and ductility and are widely used in many engineering applications. Some of these applications require further mechanical conformation for the final use. An analysis of the microstructure and the change in crystallographic texture when strips are subjected to torsion processes necessary for some applications was made in the current study. It was shown that the formation of the wavy pearlite morphology associated with the fiber texture parallel to the drawing axis could improve fatigue damage. Extreme dislocation densities and crystallographic defects induced by torsion enhanced the formation of ultrafine ferritic grains accompanied by partial cementite decomposition. The relationship between ferrite and cementite interfaces successfully simulated using the Shackleton model. Keywords
cementite decomposition, cold-drawn pearlitic strip, lattice distortion, ultrafine ferritic grains
1. Introduction There are many uses for cold-drawn pearlitic steel strips such as arrestor strips of aircraft carriers, suspension bridge cables, tire cords, and flexible pipelines used in the petroleum industry (Ref 1). Suspension bridge cables and flexible pipelines are made from cold-drawn wires or strips that are helically wound and are commonly exposed to aggressive marine environment when in operation. Flexible pipelines are widely employed at offshore equipment as oil production and gas injection pipes. A flexible pipeline is fabricated of several polymeric and metallic layers to withstand corrosion, temperature, pressure in addition to static and dynamic load. In general, polymeric layers are responsible for sealing, insulating, and wear resistance, whereas the metallic layers resist structural loads (Ref 2). Specifically, the helically wound tension armor made of medium carbon steel completely or partially sustain the tensile loads. Torsional ductility is important when the colddrawn pearlitic steel strips are subjected to further plastic deformation during manufacturing (Ref 3). Torsion test is commonly used to evaluate the torsional ductility and the fracture properties of pearlitic steel strips (Ref 4) in addition to elucidation of mechanism of cementite decomposition. Moreover, the changes in pearlite morphology and texture of both
Mohammad Masoumi, Centro de Engenharia, Modelagem e Cieˆncias Sociais Aplicadas, Universidade Federal do ABC, Santo Andre´, SP 09210-580, Brazil; and Miloslav Be´resˇ, Luis Flavio Gaspar Herculano, Rodrigo de Carvalho Paes Loureiro, and Hamilton Ferreira Gomes de Abreu, Characterization Laboratory of Materials, Department of Metallurgical and Materials Engineering, Federal Univers
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