4J43膨胀合金底吹氩工艺的物理模拟及工业应用

钢包底吹氩工艺是一种经济实用且简单易行的精炼方法,通过实验室物理模拟确定出膨胀合金4J43在底吹氩工艺中氩气流量应控制在3~7 L/min之间。在该流量范围内,合金液的混匀时间随氩气流量的增加而减少。在合适的吹氩参数下进行工业生产,实验结果表明：吹氩工艺对4J43膨胀合金中氧元素及夹杂物的去除效果明显。当氩气流量为5 L/min时,与未吹氩相比合金中氧元素含量下降56.98%,非金属夹杂物总量减少46.43%,合金中大尺寸夹杂物数量明显减少,合金在室温下的各项力学性能与同组相比均得到很大提高。

Physical Simulation of Argon Bottom Bubbling and Industrial Application for Expansion Alloy 4J43

The technology of argon bottom bubbling in tundish is a kind of economical,practical and simple method for purification.By the physical simulation in laboratory,the flow of argon should be controlled in the range of 3~7 L/min during the process of the argon bottom bubbling in tundish.In this flow range,the mixing time of liquid metal is reduced with the increase of argon flow.The appropriate parameters for industrial practice show that： The process of argon bottom bubbling can remove the elements O and the non-metallic inclusions effectively during the production of expansion alloy 4J43.Compared with unbubbling,when the argon flow is 5 L/min,the element O is dropped by 56.98 %,the total amount of non-metallic inclusions is reduced by 46.43%,the number of large-size non-metallic inclusions is reduced effectively and the mechanical properties of 4J43 alloy at room temperature have been greatly improved.