摘要
圆坯内裂纹是改善圆坯质量的难题之一,并影响企业的经济效益。采用实验和数值模拟相结合的方法,通过建立热机耦合有限元仿真模型,重点研究圆坯的凝固过程,并利用实测的铸坯温度和铸坯厚度来验证有限元模型的正确性。仿真分析表明圆坯内裂纹是由于圆坯在凝固过程中凝固前沿应变超出了材料临界应变而形成的。最后,在分析主要工艺参数对铸坯凝固过程影响的基础上,提出了有效防止铸坯内裂纹产生的二冷工艺参数优化方案。
Internal crack has become a main quality problem in round billet which reduces the economical benefits greatly. This paper describes an investigation on the formation mechanism of internal crack in a round billet using measurement and numerical simulation to model the solidification process by building a thermo-mechanical coupling model. This FEM model has been validated by comparing the results including the surface temperature and the solidified shell thickness of round billet with experiment data. The strain and stress during the solidification process are also discussed. The reason of the internal crack is that the strain at the front edge of solidification exceeds the critical strain. Optimum process parameters of the secondary cooling system are also suggested by analyzing the influences of these parameters on the solidification process.
出处
《炼钢》
CAS
北大核心
2009年第1期47-50,共4页
Steelmaking
关键词
圆坯
内裂纹
热机耦合
二冷系统
round billet
internal crack
thermo-mechanical coupling
secondary cooling system
