Abstract
A hypereutectoid steel with chemical compositions of 0.85C, 0.24Si, 0.82Mn, 0.011P, 0.01S, 0.02Al and 0.05Cr in mass% was hot-rolled and patented through an industrial process to produce fully pearlitic structure (P1). Specimen P1 was then drawn by 75% in area reduction (P2) and aged at 698 K for 0.6 ks (P4: Zn-plating simulated heat). Textures were measured on these specimens and evaluated by (110) pole figure. The orientation distribution of P1 shows approximately random while that of P4 is sharp <110> fiber texture along the drawing direction. Tensile tests were performed for P1 and P4 and neutron diffraction measurement was conducted for their deformed specimens. By using a conventional θ-2θ method, lattice plane spacing of (110) ferrite was measured, where a specimen was rotated by 0, 22.5, 45, 67.5 and 90 degrees with respect to the tensile direction. The residual elastic strains for P1 and P4 show the strong direction dependence; as an overall trend, the strain changes from compression to tension with increasing the measuring angle from 0 to 90°. However, in the case of P4, the residual strain at 90°is lower than that at 67.5°. It is concluded that the <110> fiber texture is attributed to the low residual strain at 90°.
