摘要
为进一步提高Cr-Co-Mo-Ni齿轮钢材料的均匀性和细晶化,建立了直径290 mm的齿轮钢钢锭真空自耗熔炼过程三维数学模型,研究了熔炼工艺参数对钢锭凝固组织分布及晶粒大小的影响规律。结果表明:在工艺参数可调范围内,冷却强度越大,晶粒尺寸越小、数目越多,二次枝晶间距越小;熔池温度越低,晶粒的细化效果越好,二次枝晶间距也越小;降低冶炼速率,形核数目增多,晶粒尺寸减小,但对二次枝晶间距的影响较小。对齿轮钢真空自耗熔炼工艺参数优化调整后,模拟结果显示,自耗锭内部等轴晶区域增大将近一倍,晶粒尺寸得到明显细化;最大二次枝晶间距减小了4.88%,合金元素分布实现均匀化。
To further improve the high uniformity and grain refining of Cr-Co-Mo-Ni Gear Steel materials, a three-dimensional mathematical model of vacuum arc remelting process of 290 mm diameter was established, and the influence rule of remelting process parameters on solidification characteristics and grain size was carried on research. It is shown that within the scope of the adjustable parameters, increasing cooling intensity can minish the grain size and secondary dendrite arm spacing （SDAS）, increase the number of grains; reducing bath temperature can refine grain effectively, decrease SDAS; decreasing smelting rate can increase the number of nucleation and minish the grain size, but has little effect on SDAS. After optimizing the remelting process parameters, the equiaxial crystal rate of consumable ingot increased nearly doubled and the grains got refined obviously; the maximum SDAS decreased by 4.88%and the alloying elements distribution realized homogenization.
出处
《工业加热》
CAS
2014年第6期23-27,共5页
Industrial Heating
基金
国家自然科学基金(51304016)
