摘要
采用酸洗、金相检测、能谱分析等方法,对高Nb、Ti含量钢坯在轧钢过程中的开裂原因进行研究,结果表明:大量析出的碳氮化物引起的内部微裂纹是造成高Nb、Ti含量钢开裂的直接原因。高温热塑性试验证实,高Nb、Ti含量钢在660～910℃下存在脆性温度区间。通过成分控制、稳定拉速、降低二冷段冷却速率以及稳定结晶器液面,可基本消除高Nb、Ti含量钢轧钢开裂现象。
The causes of cracks in high Nb and Ti content billet in the process of steel rolling was investigated by pickling,metallography detection and energy spectrum analysis.The results show that the direct reason for crack forming is the inner microcracks caused by large amount of carbonitride separated out in the process.It is proved in the thermoplasticity test that there is a brittleness temperature range at 660～910 ℃ for the steel.The cracks can be avoided through controlling chemical compositions,stabilizing the casting speed and liquid level in the mold,and reducing the cooling rate in the secondary cooling.
出处
《钢铁钒钛》
CAS
北大核心
2013年第3期83-87,共5页
Iron Steel Vanadium Titanium
关键词
高Nb、Ti钢
钢坯
开裂
热塑性
steel with high Nb and Ti content
billet
crack
thermoplasticity
