Development of Texture in Interstitial-Free Steel Processed by Equal-Channel Angular Pressing

Abstract

Ti + Nb-stabilised interstitial-free steel is deformed by equal-channel angular pressing (ECAP) adopting a route BC up to an equivalent strain of 24. Upon ECAP the grain size decreases to ultrafine level and it becomes strongly textured. At evm = 0.6-6, components of both {110} fiber, \( J_{\uptheta } \), \( \bar{J}_{\uptheta } \) and of 〈111〉 fiber, D 1θ, D 2θ with common components of E θ, \( \bar{E}_{\uptheta } \) are existing but after evm ≥9, only 〈111〉 fiber components are observed. At large strain, evm = 9-24, 〈111〉 fiber texture is recorded with monoclinic symmetry. At evm = 0.6, coarse grains get split into deformation bands. Fragmentation of bands (at evm = 3) suppress \( \bar{J}_{\uptheta } , \) \( J_{\uptheta } \) components. At evm = 6, formation of lamellar structures increases intensity of mainly D 1θ, D 2θ. At evm = 9, oriented ribbon grains result in strong D 1θ, D 2θ components with 〈111〉 fiber. At evm = 15-24, conversion of ribbon grains to near-equiaxed shaped grains maintains 〈111〉 fiber texture with enhanced intensity of D 1θ and D 2θ components.