Ti-26高强钛合金斜轧穿孔工艺研究

Study on Rotary Piercing Technology of Ti-26 Titanium Alloy

研究了Ti-26高强钛合金斜轧穿孔制备管坯工艺。测试了穿制的Ti-26合金管坯的力学性能,用金相显微镜观察了管坯的显微组织,用扫描电镜分析了拉伸断口的形貌。结果表明,采用斜轧穿孔方式完全可以制备Ti-26高强钛合金管坯;在1050℃下,选择合适的轧辊转速和前进角可顺利穿制Ti-26高强钛合金管坯,其管坯的强度为815MPa,延伸率达到13%,断面收缩率达到45%,晶粒度按ASTME标准为6级,比穿孔前细化,断口呈明显的塑性断口,加工管材无需热处理可以直接进行轧制,道次加工率可达45.8%。

The process prepared by rotary piercing technology for Ti-26 titanium alloy pipe was studied in the paper. The tensile properties of the pipes were determined, the microstructure was observed by metalloscopy, and the fracture morphology was analyzed by SEM. The results show that the Ti-26 alloy piercing pipe with high performance can be fabricated successfully by rotary piercing technology with suitable rotational speed and approach angle at 1 050 ℃, of which the strength is 815MPa, the elongation 13% and the reduction of area 45%. The Crystal grain degree of piercing pipe is six grade in ASTM standard, which is finer than that before piercing. This kind of pipe can follow to be rolled directly without heat treatment, which the reduction per area is able to reach 45.8%.