直冷连铸工艺参数对超轻LA141合金板坯温度场的影响

Influence of Casting Parameters on Temperature Distribution of Direct Chill Casting of Superlight LA141 Alloy Slabs

摘要: 直冷连铸工艺中各铸造参数的互相匹配至关重要,通过有限差分方法,用Visual C++ 6.0建立了超轻LA141合金扁坯连铸过程中三维温度场的数学模型,讨论了各种工艺参数,如拉坯速度、冷却水流量、浇注温度等对凝固过程中板坯温度场的影响,在此基础上优化了超轻合金LA141合金扁坯直冷连铸工艺参数.结果表明:冷却水流量对液穴深度的影响较小,提高浇注温度和拉坯速度使液穴变深,出结晶器时凝固壳层厚度减小.优化后的工艺参数为浇注温度670~700 ℃,冷却水流量0.8~1.0 m3·h-1,拉坯速度1.0~1.25 mm·s-1.

Abstract: The matching of casting parameters during the direct chill (DC) casting process is very important.The 3-D mathematical model of DC casting of superlight LA141 alloy slabs was built using the finite differential method (FDM) and Visual C++ 6.0.The influence of casting parameters,such as the drawing speed,cooling water flow,and pouring on temperature distribution during solidification process was analyzed.The parameters during DC casting process of superlight LA141 alloy slabs were optimized.The optimized pouring temperature is 670-700 ℃,the coding water flow is 0.8-1.0 m3·h-1,and the drawing speed is 1.0-1.25 mm·s-1 .