Superplasticity of ultrafine grained low-carbon HSLA steels

Verdeja González, José Ignacio; Quintana, María José; García García, José Ovidio; Verdeja González, Luis Felipe; Gonzalez-Ojeda, Roberto; Fernández Fernández, Sara

Superplasticity of ultrafine grained low-carbon HSLA steels

Journal

AIST Steel Properties and Applications Conference Proceedings - Combined with MS and T'12, Materials Science and Technology 2012

Date Issued

2012

Author(s)

Verdeja González, José Ignacio

Quintana, María José

Facultad de Ingeniería - CampCM

García García, José Ovidio

Verdeja González, Luis Felipe

Gonzalez-Ojeda, Roberto

Facultad de Ingeniería - CampCM

Fernández Fernández, Sara

Type

text::conference output::conference proceedings::conference paper

URL

https://scripta.up.edu.mx/handle/20.500.12552/4669

Abstract

Steels with ultrafine grained structure may present superplastic behavior at specific temperatures and strain rates that allow the grain boundary sliding mechanisms to be activated. The work presents high temperature tension tests in a low carbon, low alloy steel obtained by advanced thermomechanical controlled rolling processes, showing at 800°C elongations as high as 200%. The microstructure of the steel was analyzed in order to identify ferrite and pearlite grain boundaries, and their interaction after the specimens were deformed, showing intergranular decohesions, restored ferrite grains and elimination of banded structure, which are evidence of superplastic mechanisms in this material which is, in fact, ultrafine grained as demonstrated by quantitative metallographic techniques and grain size distribution analysis.