Ultrafine Grained HSLA Steels for Cold Forming

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

doi:10.1016/S1006-706X(10)60183-5

Ultrafine Grained HSLA Steels for Cold Forming

Journal

Journal of Iron and Steel Research International

ISSN

1006-706X

2210-3988

Date Issued

2010

Author(s)

García García, José Ovidio

Barbés Fernández, Miguel Ángel

Verdeja González, Luis Felipe

Verdeja González, José Ignacio

Gonzalez-Ojeda, Roberto

Facultad de Ingeniería - CampCM

Quintana, María José

Facultad de Ingeniería - CampCM

Type

text::journal::journal article

DOI

10.1016/S1006-706X(10)60183-5

URL

https://scripta.up.edu.mx/handle/20.500.12552/3700

Abstract

The industrial level production of ultrafine grained (or ultrafine ferrite) ferrous alloys was investigated through three examples of steels that complied with the EN 10149-2 Euronorm and were produced by advanced controlled hot rolling techniques. The steel samples were tension tested and chemically analyzed, and the microstructure was evaluated through quantitative metallographic techniques to determine parameters such as yield stress, amount of microalloying elements, strain hardening coefficient, grain size, and grain size distribution. These steels were micro-alloyed with Ti, Nb, and Mn with ASTM grain sizes of approximately 13–15. The careful control of chemical composition and deformation during production, giving a specific attention to the deformation sequences, austenite non-recrystallization temperatures and allotropic transformations during cooling, are indispensable to obtain steels with an adequate strain hardening coefficient that allows cold working operations such as bending, stretching or drawing.