论文部分内容阅读
本文综述钛合金中ＬＤＩ夹杂的来源、危害、溶解机制和消除方法．ＬＤＩ夹杂是造成飞机发动机旋转件疲劳断裂的主要原因．影响着钛合金在飞机发动机上的应用，研究发现ＬＤＩ夹杂是一些富含氮、碳、氧等α稳定元素的相区．这些硬α相熔点高、脆性大，在机加工后形成断裂源．因其熔点高，ＬＤＩ夹杂不能通过三次ＶＡＲ熔炼消除．研究表明ＬＤＩ夹杂的消除是一个溶解扩散过程，ＨＭ＋ＶＡＲ熔炼工艺是消除ＬＤＩ夹杂的有效途径．现正研究的ＨＭ一次熔炼工艺既可消除ＬＤＩ夹杂，又可减少生产环节和生产成本，将成为将来生产优质钛合金铸锭的主要方法．
This article reviews the sources, hazards, dissolution mechanisms and elimination methods of LDI inclusions in titanium alloys. LDI inclusions is the main cause of fatigue fracture of the rotating parts of aircraft engines. Affecting the application of titanium alloy in aircraft engines. The study found that LDI inclusions are some phase regions rich in α-stable elements such as nitrogen, carbon and oxygen. These hard α-phase melting point high, brittle, forming a fracture source after machining. Due to its high melting point, LDI inclusions can not be eliminated by three VAR smelting. Studies have shown that the elimination of LDI inclusions is a diffusion process, HM + VAR melting process is an effective way to eliminate LDI inclusions. HM is now studying a melting process can eliminate the LDI inclusions, but also reduce production processes and production costs, will become the main method of producing high-quality titanium alloy ingot.