Effect of Shear Strain on the Microstructural Evolution of a Low Carbon Steel during Warm Deformation

Abstract

The microstructural evolution of a low carbon steel was investigated under two different conditions with and without shear strain, using electron backscattered diffraction (EBSD) when a uniaxial compression of 67% was applied at a warm working temperature of 773 K. The equivalent strain and shear strain imposed by the compression test were calculated quantitatively by finite element analysis (FEA). As the equivalent strain was increased without any shear strain, the texture of the and fibers was strongly developed, and the grain refinement was accelerated. However, as the shear strain was increased at the same equivalent strain, the thickness of the pancaked ferrite decreased and the texture was weakened. With increasing shear strain, a shear texture, such as h110i == TD and f110g == ND, was observed and a high angle boundary over 15 developed at the expense of low and medium angle boundaries below 15 . The shear strain accelerated the subdivision of the ferrite grain and randomized the texture.

Microstructure and mechanical properties of Al/Ti/Al laminated composites prepared by roll bonding

“…5(c)), the initial grains in the region near the surface of Al layer were fragmented into the equiaxed fine grains. This indicates that the redundant shear strain plays an important role in grain refinement, which is consistent with the role of shear strain in ultragrain refinement during ARB process of aluminum [50] and IF-steel [52][53][54]. At the same time, the fraction of high-angle boundaries over 15° was up to 68% in the surface region of Al layer.…”

“…At the same time, the fraction of high-angle boundaries over 15° was up to 68% in the surface region of Al layer. The shear strain introduced by high friction accelerates the grain subdivision, which is similar to the finding by Kang et al [54] in the warm deformation of low carbon steel.…”

Texture Formation in Flow Formed Ferritic Steel Tubes and the Influence of the Process Parameters

“…THERMEC 2013 lubricant which ensures low temperatures are maintained and such annealing phenomena are prevented [15]. Some researchers have reported this fibre to form due to shear deformation [16]. In close agreement to this finding, the present CPFEM predictions have shown that the Φ=0° fibre forms due to biaxial deformation (Fig.…”

Strain Variations on Rolling Condition in Accumulative Roll-Bonding by Finite Element Analysis

“…Inoue et al, 2002 reported that in the ferrite grain transformed from deformed austenite, the grain size in the area with the shear strain is finer than that in the area without the shear strain under the same equivalent plastic strain. Cho et al, 2004;Kang et al, 2010 demonstrated significant advances in high angle grain…”