TC4钛合金VAR熔炼过程中夹杂物演变的数值模拟分析

Numerical Simulation Analysis of Inclusion Evolution During VAR Melting of TC4 Titanium Alloy

采用MeltFlow软件,对TC4钛合金铸锭在真空自耗电弧熔炼(VAR)过程中不同相对密度及不同直径掉渣、掉块等夹杂物的运动及分布规律进行了数值模拟。通过电极棒中添加海绵钛的方式熔炼铸锭并锻造成棒材开展实验验证,并采用超声波无损探伤方式对缺陷进行检验判定。结果表明,不同相对密度及不同直径的夹杂物在铸锭熔炼中运动及分布规律存在明显差异。大块氧化物夹杂经过一次熔炼并不能完全熔解,最终在棒材上会形成可探伤的缺陷。

The motion and distribution of inclusions with different relative densities and diameters during vacuum consumable arc melting(VAR)of TC4 titanium alloy ingots were simulated by MeltFlow software.The ingots were melted by adding titanium sponge to the electrode rod and forged into the bar to carry out the experimental verification,and the ultrasonic nondestructive testing was used to check and determine the defects.The results show that the motion and distribution of inclusions with different relative densities and diameters are obviously different during ingot smelting.Large oxide inclusions can not be completely melted after a smelting,and it can finally form defects and can be detected in the bar.