摘要
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．
The sources harmness dissolution mechanism and elmination method of low density inclusion(LDI) weresummarised. LDI is the main reason of fatigue crack of plane jet engine rotating components, and influences thetitarnium's application in plane engine. It is discovered that LDI is some phase zones enriched alpha stabilizing alloy elements such as N, C, O, etc. These hard alpha phases, which have high melting point andhigh brittleness, become the source of cracks after being worked. LDI cannot be eliminated by triple VAR.LDI's elimination is a dissolution/diffusion controlled process. BM+VAR is a method to eliminatethe LDI. The HM process can not only eliminate LDI, but also reduce the cost and the recycling timeof production, so it will be the primary method to produce premium titanium alloys.
出处
《有色金属》
CSCD
1999年第3期72-75,共4页
Nonferrous Metals
