Structure and Strength of IF Steel After Large Strain Deformation (original) (raw)

Microstructure and Texture in Steels, 2009

Abstract

ABSTRACT Interstitial free (IF) steel with an ultrafine microstructure has been produced by three different routes: (i) cold rolling, (ii) accumulative roll-bonding (ARB) and (iii) martensitic transformation followed by cold rolling. The microstructure refines with increasing strain without saturation to a value of about 100 nm at an equivalent strain (εVM) of 8, which is the maximum strain investigated. At all strains a microscopic analysis by transmission electron microscopy (TEM) and electron backscatter diffraction (EBSD) shows that the microstructure is subdivided by dislocation boundaries and high-angle boundaries. For both cold rolled samples and ARB samples the flow stress increases as the boundary spacing decreases. For the finest structures this leads to a flow stress at room temperature in the range 900–1000 MPa. Finally structure-property relationships are discussed especially the effect of post-processing treatments by annealing and by low strain deformation.

Niels Serup-Hansen hasn't uploaded this paper.

Let Niels know you want this paper to be uploaded.

Ask for this paper to be uploaded.