厚壁Gr.3钛管轧制工艺研究

Study on Rolling Process of Thick-walled Gr.3 Titanium Tubes

摘要:

设计了两种氧含量的Gr.3管材，并按照Gr.3厚壁钛管的变形工艺，截取各道次加工过程中管材的变形锥体，依据一定的规律截取锥体上不同部位的断面，检测断面的显微硬度并得到不同氧含量管材的硬度在整个变形过程中的分布曲线，对照各个部位的显微组织，分析了硬度分布曲线与轧制变形过程之间的规律及相互关系，发现当变形量在10%~20%以下时，断面上的硬度有较大差异，氧含量越低，该现象越明显；氧含量的提高加大了断面上沿壁厚方向变形的不均匀影响，厚壁Gr.3管材在变形过程中，其变形量应大于35%，送进量宜小，曲线尤其是内孔曲线平缓对管材质量的提高有帮助。

Abstract:

Gr.3 titanium tubes with two kinds of different oxygen content was designed, the thick-walled Gr.3 titanium tubes deforming cones were intercepted in accordance with determinate rule, then the micro-hardness on cross sections were tested, and the distribution curve of HV in the whole rolling duration was drawn. Comparing the microstructure at different positions of tubes rolled, the relation of HV variation and rolling process were investigated. Results show that the difference of HV on cross sections is large when the deformation rate is below 10%~20%, which is much more obvious in the case of lower oxygen content. The higher oxygen content is, the larger tendency of non-homogeneous of HV in radial direction of tubes becomes. As a result, the deformation rate should be greater than 35% and the entering amount should be small in the rolling process of thick-walled tubes; furthermore, the groove curve keeping smooth is beneficial to improve the quality of tubes.