离心铸造钛合金件的力学性能变化规律

Mechanical Properties of Centrifugal Casting Titanium Alloys

摘要:

采用水冷铜坩埚真空感应凝壳熔炼设备，制备离心力场下不同旋转时间的钛合金铸件，研究离心半径、补缩冒口以及旋转时间对钛合金铸件的抗拉强度、屈服强度、延伸率和显微硬度的影响规律。结果表明：离心旋转时间相同时，钛合金铸件的力学性能随着离心半径的增加而改善，有补缩冒口时可以获得力学性能优异的铸件。旋转时间15与1.5 min相比，获得的铸件力学性能更优异，这是由于铸件显微组织细化，导致晶界强化，位错滑移的阻力增大所造成的。

Abstract:

Titanium alloy castings are obtained with different rotation time in the ISM apparatus. The effects of rotation radius, riser and rotation time on the tensile strength, yield strength, specific elongation, and microhardness are investigated. The results show that the mechanical properties increase with the increase of rotation radius for the same rotation time. Excellent mechanical properties can be obtained for the casting with riser. As the rotation time is increased from 1.5 min to 15 min, the mechanical properties are greatly improved due to the finer microstructure and the strengthened grain boundary and then resulting in the increase of the resistance to dislocation slipping.