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Formation of Initial Defects at Meniscus in Oscillating Mold
Author(s) -
Zuo Xiao Jing,
Lin Ren Gan,
Wang Ning,
Yang Jie,
Meng Xiang Ning,
Zhu Miao Yong
Publication year - 2016
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201500265
Subject(s) - meniscus , mold , materials science , oscillation (cell signaling) , continuous casting , shell (structure) , bending , composite material , casting , stress (linguistics) , mechanics , slab , fracture (geology) , structural engineering , optics , physics , chemistry , biochemistry , linguistics , philosophy , incidence (geometry) , engineering
The initially formed defects in the mold of continuous casting are likely to be expanded and propagated in the subsequent processing. Based on the principle of material mechanics, a mathematic model is proposed to describe the development of the solidifying shell at meniscus for continuous casting steel slab of low‐carbon ([C] = 0.04%) that with the cross‐section of 1200 mm × 200 mm. The influence of mechanical stress induced by the mold oscillation on the growth state of meniscus shell and the primary dendrites is evaluated in combination with a non‐sinusoidal oscillation mode of mold. The results suggest that the stress caused by the shell bending tends to exceed the critical fracture strength of initial solidifying shell at high temperature. The initial surface crack is formed easily when the upward oscillation velocity of mold exceeds 1.6 m min −1 and is located at 1.9–5.6 mm below meniscus. The subsurface crack is formed when the downward velocity oversteps 6 m min −1 during the negative strip time and is produced in the distance from 3.1 to 4.3 mm below meniscus. The growth direction of primary dendrite changed regularly along with the mold oscillation.