Interdendritic microsegregation development of high-strength low-alloy steels during continuous casting process

Research output: Contribution to journalArticle

Authors

Colleges, School and Institutes

External organisations

  • Institute of Engineering Thermophysics, Chinese Academy of Sciences

Abstract

A 1-D model based on DICTRA software was used to simulate Mn microsegregation in highstrength low-alloy steels during continuous casting. The experimentally determined (using a cumulative profiling method) segregation results were in good agreement with the modelling results. Steels undergoing solidification via a peritectic reaction had a larger segregation range than non-peritectic steels ascribed to trapping of the alloying atoms in liquid by austenite acting as a diffusion barrier. Subsequent, post-solidification cooling through the single phase austenite field decreased the microsegregation level, although the last γ →α phase transformation did affect the segregation profile in the solute-depleted dendrite centre. Simulation indicates that segregation levels could be reduced by decreasing either secondary dendrite arm spacing or adopting faster cooling rates through solidification.

Details

Original languageEnglish
Pages (from-to)1337-1346
Number of pages10
JournalMaterials Science and Technology (United Kingdom)
Volume35
Issue number11
Early online date10 Jun 2019
Publication statusPublished - 24 Jul 2019

Keywords

  • Microsegregation characterisation, microsegregation modelling, DICTRA, solidification, HSLA continuously cast steel