摘要
采用对比方法研究了锻造温度、变形程度、锻后冷速对Ｔｉ—１７合金组织性能的影响和产生“β脆性”的原因。试验表明，Ｔｉ—１７合金在相变点以上４０～６０℃加热锻造、３０％以上变形程度和锻后水冷，可获得高的强度和塑性的配合；其“β脆性”与原始β晶粒和晶界α粗化、晶内α形态和分布有关；锻后水冷和大变形可减少以致消除“β脆性”。试验还表明，近β锻造同样适用于Ｔｉ—１７合金。
In order to achieve satisfactory production of Ti-17 alloy compressor disk for Chineseaircraft engine, suitable hotworking parameters need to be determined. In this paper, wepresent our findings on suitable hotworking parameters for Ti-17 alloy forging.Our test results for three different methods of forging-β, near β, and normalshow that β and 'near β' are better and that β is a little superior to 'near β'.In our tests, forging temperature ranges atom 820-950℃, deformation degree rangesfrom 10% to 70%, and either air or water cooling is used. It is found that the suitable hotworking parameters for β forging are: (1) heating temperature 40￣60℃ above β transuspoint (870℃), (2) above 30% deformation, (3) water cooling after forging. Such parameters are conducive to a good combination of strength and ductility. Water cooling after forging can reduce or even eliminate beta brittleness. As can be seen from Fin. 2, Beta brittlenessis related to coarsening of prior β grain, to grain boundary α, and to mophology and distribution of core α.
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
1995年第3期340-344,共5页
Journal of Northwestern Polytechnical University
关键词
Β锻造
β脆性
钛合金
锻造
Ti-17 alloy, β forging, beta brittleness
