Modelling of macrosegregation in a 231-ton steel ingot with multi-pouring process. (May 2015)

• Record Type: Journal Article
• Authors: Tu, W. T.; Shen, H. F.; Liu, B. C.
• Is Part Of: Materials research innovations. Volume 19(2015)Supplement 4
• Page Start: S59
• Page End: S63
• Publication Date: 2015-05
• Subjects: Macrosegregation, -- Multi-pouring process, -- Steel ingot, -- Two phase solidification model; Materials -- Research -- Periodicals; Matériaux -- Recherche -- Périodiques; 620.1105
• DOI: 10.1179/1432891715Z.0000000001517
• Languages: English
• ISSNs: 1432-8917

Abstract

Abstract : Large steel ingots with homogeneous internal quality are critical to the key components of the heavy equipments. Multi-pouring (MP) process, i.e. the sequential pouring with different carbon concentration, is widely applied for the production of steel ingots. Multi-pouring process aims to build an initial delaminated carbon concentration distribution for the solidification of steel ingots. However, it still remains unclear on the effect of initial concentration distribution on the macrosegregation. The purpose of current study is to assess this effect by a two phase solidification model. Non-orthgonal grids have been adopted for the geometry boundary fitness. Both teeming and subsequent solidification are included in current simulations for a 231-ton steel with two ladles poured. Besides, a prediction with homogeneous initial concentration distribution is adopted as the reference case. Predictions are compared with measurements along different transverse sections of ingot. It is demonstrated that the initial concentration distribution is an important factor for the macrosegregation formation, and the delaminated concentration distribution after MP process favours to depress the macrosegregation.