摘要
利用Thermo-Calc热力学软件对节镍奥氏体不锈钢凝固模式和相组织转变温度等进行了模拟计算分析,借助Gleeble-3800热模拟机测试了铸坯高温塑性,利用EPMA探针分析了钢卷表面裂纹脱皮缺陷的微观形貌和微区成分。试验结果表明:节镍奥氏体不锈钢存在类似于低碳钢的包晶反应,会导致铸坯纵裂纹及塑性降低。基于Thermo-Calc模拟计算,对节镍奥氏体不锈钢的化学成分进行了优化,成分优化后,铸坯纵裂纹发生率由8.92%降到2.64%,钢卷裂纹脱皮发生率由12.45%降到3.77%。
Thermo-Calc thermodynamic simulation was utilized to analyze the solidification behavior and the phase transition temperature of low nickel stainless steel. Gleeble-3800 thermal simulator was applied to study the high temperature plasticity, EPMA was adopted to study the microstructure and chemical composition of the coil surface crack defects. The results show that there exists the peritectic reaction for low nickel austenitic stainless steels, which is similar to the low carbon steels. The peritectic reaction would lead to the reduction of high temperature plasticity and therefore the high risk of surface longitudinal crack of slab. Based on these studies, the chemical composition of low nickel austenitic stainless steel was optimized. After optimizing the composition, longitudinal crack of slab decreased from 8.92 % to 2.64 %,and the surface crack of coil decreased from 12.45 % to 3.77 %.
作者
周庆龙
蒋一
竺安果
江来珠
ZHOU Qinglong;JIANG Yi;ZHU Anguo;JIANG Laizhu(Research Institute of Tsingtuo Group Co.,Ltd.,Fuan 355006,China)
出处
《炼钢》
CAS
北大核心
2019年第6期72-76,共5页
Steelmaking
