Open AccessTécnicas para revelar el borde de grano austenítico en aceros microaleados
Author(s) -
Carlos García de Andrés,
Maria Jesus Bartolome Garcia,
Carlos Capdevila,
David San-Martín,
Francisca G. Caballero,
Víctor López Serrano,
Francisco Javier Vara Minambres
Publication year - 2001
Publication title -
revista de metalurgia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.195
H-Index - 18
eISSN - 1988-4222
pISSN - 0034-8570
DOI - 10.3989/revmetalm.2001.v37.i4.518
Subject(s) - austenite , grain boundary , materials science , microstructure , metallurgy , condensation , thermodynamics , physics
The prior austenite grain size (PAGS) exerts an important influence on the microstructures forged by continuous cooling in the steel and on their mechanical properties. Since microalloyed steels have received considerable attention in the last years and enormous difficulties have been repetitively to reveal the austenite grain boundaries in these steels, this work analyzes the different techniques effective in that sense, which enable thus an accurate determination of the PAGS. This paper presents results obtained applying different conventional techniques such us chemical etching of quenched microstructures, the application of thermal cycles that enable the formation of phases around the prior austenite grain boundaries or oxidation etching which reveals the austenite grain boundaries by the preferential accumulation of oxides. Finally, an innovative and effective technique to reveal the prior austenite grain boundaries is presented. This technique is based on the preferential transfer of matter from the grain boundaries to the surrounding austenite by complicated mechanisms such as evaporation-condensation and volume and surface diffusion of atoms.Peer Reviewe