Mn18Cr18N电渣重熔钢锭凝固组织的CA法模拟

CA Method Simulation of Solidification Structure of Mn18Cr18N Electroslag Remelting Ingots

借助PROCAST软件的元胞自动机(CA)微观组织模拟方法,分析了Ф300 mm(Ф100 mm)×350 mm Mn18Cr18N高氮奥氏体不锈钢空心钢锭的电渣重熔凝固工艺,确定了合理的凝固工艺参数、冷却条件、凝固晶粒组织的形核密度与生长速度。在此基础上,分析了Ф712 mm(Ф308 mm)×1202 mm空心钢锭电渣重熔金属熔池形状和底部冷却条件对凝固组织特征的影响。结果表明,电渣重熔熔速(渣-金界面上涨速度)控制在0.1 mm·s^-1以下,可以获得理想的熔池形状和凝固柱状晶组织;底部传热系数达到500 W·m^2·K^-1可提供足够的冷却能力,并获得最大尺寸的底部柱状晶区。

By using PROCAST software of cellular automata(CA),microstructure simulation method analyzes the 300 mm in diameter(inner 100 mm in diameter)with length 350 mm of Mn18Cr18N high nitrogen austenitic stainless steel electroslag remelting(ESR)of hollow ingot solidification process,the reasonable solidification process parameters,cooling condition,solidification grain nucleation density and growth rate of the microstructure.On this basis,the analysis of the 712 mm in diameter(inner 308 mm in diameter)with length 1202 mm hollow ingot ESR metal molten pool at the bottom of the shape and the influence of cooling conditions on the solidified structure characteristics.The results show that the ESR melting speed(slag-the rise of gold interface)control in 0.1 mm·s^-1 the following,can obtain the ideal shape of molten pool and the microstructure of the columnar crystal solidification;At the bottom of the heat transfer coefficient of 500 W·m^2·K^-1 can provide enough cooling capacity,and achieve maximum size at the bottom of the columnar crystal area.