Austenite grain abnormal growth in the microalloyed steel 38MnSiV55 and determination of driving and pinning forces

Authors

  • S. F. Medina Centro Nacional de Investigaciones Metalúrgicas (CENIM)
  • M. Chapa Centro Nacional de Investigaciones Metalúrgicas (CENIM)
  • M. Gómez Centro Nacional de Investigaciones Metalúrgicas (CENIM)
  • A. Quispe Centro Nacional de Investigaciones Metalúrgicas (CENIM)
  • V. López Centro Nacional de Investigaciones Metalúrgicas (CENIM)
  • B. Fernández Centro Nacional de Investigaciones Metalúrgicas (CENIM)

DOI:

https://doi.org/10.3989/revmetalm.2003.v39.i6.355

Keywords:

Abnormal grain growth, Precipitate size distribution, Pinning forces, Driving forces

Abstract


Several castings of 38MnSiVS5 steel have been manufactured with different titanium and aluminium contents and the austenitic grain size has been determined at temperatures between 900 and 1200 °C. The volume fraction of normal and abnormal grain growth have been quantified. The results show that abnormal growth of the austenitic grain occurs irrespective of the titanium and aluminium contents, due fundamentally to the partial dissolution of TiN precipitates. The steels with high aluminium contents have presented worse behaviour due to the formation of a second type of precipitates, namely AIN, which quickly dissolve between 1000 and 1100 °C, causing a drastic decline in the local pinning forces which gives rise to more pronounced abnormal growth of the affected grains. In parallel, a study of the precipitates has been carried out by transmission and scanning microscopy, allowing the calculation of pinning forces according to Zener and Gladman expressions and the establishment of a comparison with driving forces. This comparison makes it possible to explain the differences encountered between the different castings.

Downloads

Download data is not yet available.

Downloads

Published

2003-12-30

How to Cite

Medina, S. F., Chapa, M., Gómez, M., Quispe, A., López, V., & Fernández, B. (2003). Austenite grain abnormal growth in the microalloyed steel 38MnSiV55 and determination of driving and pinning forces. Revista De Metalurgia, 39(6), 408–417. https://doi.org/10.3989/revmetalm.2003.v39.i6.355

Issue

Section

Articles

Most read articles by the same author(s)

1 2 3 > >>