离心场对钛合金铸造性能的影响

Effect of Centrifugal Field on Casting Characteristic of Titanium Alloy

在立式离心场下和重力场下对石墨型钛合金铸件在铸造过程的充填及凝固情况进行研究。结果表明:在立式离心场下钛合金熔体的铸造性能好,其流动性和充填性得到很大改善;尤其对3mm壁厚薄壁件,在重力场下由于充填阻力大于充填力,合金熔体无法完全充填铸型,而在离心场下可以实现全部充填,且最小壁厚可达到0.3mm。此外,离心场下由于离心力和科氏力的共同作用,铸件的缺陷明显减少,且随铸型转速的增加而不断减小。

The filling and solidification process of titanium alloy melt in graphite mold was investigated in vertical centrifugal field and in gravity field, respectively. The results show that the process in the former is better than that in the later. The flowability and the filling ability of the melt in the centrifugal field are much improved, it is especially favorable for producing the castings with 3 mm thin wall. The mold can not be fully filled by the melt in the gravity field, in such case the filing resistance is larger than filling force. The full filling can be realized in the centrifugal field. By which the minimum wall thickness of a casting can reach 0.3 mm In addition, under the common action of Coriolis force and centrifugal force, the defects of titanium alloy casting decreases with increasing of rotational velocity.