Effect of Pre-strain on Microstructure, Texture, and Strengthening of Fully Pearlitic Steel

Author(s)

Masoumi, Mohammad ; de Carvalho Paes Loureiro, Rodrigo ; Pinheiro, Pedro ; Cardoso, Jorge Luiz ; Beres, Miloslav ; de Abreu, Hamilton Ferreira Gomes

• Document type: Journal article
• Source: Journal of Materials Engineering and Performance; v. 31, n. 6, p. 13-pg., 2022-01-27.

Abstract

The changes of microstructure, crystallographic texture, and phase/boundary interface in fully pearlitic industrial steel, under coiling and uncoiling process were comprehensively investigated. The scanning electron microscopy investigation showed that localized stress accumulation at the ferrite-cementite interface promotes cementite fragmentation. The macro texture analysis revealed that the as-received material demonstrated a {001}, {110} and {112} texture parallel to the normal direction. After the coiling and uncoiling process, the {112} grains partially rotated into {110} and {111} grains oriented along the normal direction. This led to a significant increase in dislocation density due to the lattice distortion and localized stored energy as determined by the point-to-point Kernel misorientation analysis. Multiplication of ferrite-cementite interfaces and increase in crystallographic defects and pile-ups influenced the effective shear stress, leading to a brittle fracture mode. (AU)

• FAPESP's process: 21/02926-4 - Improvement of mechanical properties and wear resistance by set of nanostructured bainitic microstructure via novel heat treatment of medium carbon-silicon steels
• Grantee: Mohammad Masoumi
• Support Opportunities: Regular Research Grants