摘要
通过改变时效温度研究热处理制度对β锻造后TC17钛合金显微组织和力学性能的影响,并根据其服役要求选择较佳的热处理制度。结果表明：随着时效温度的升高,显微组织中晶内次生片层状α相集束尺寸增大,位向关系变得简单,β相转变组织含量增多,合金的强度减小,塑性及断裂韧性升高,采用800℃×4 h,WC＋660℃×8 h,AC较佳热处理制度,TC17钛合金的室温拉伸性能、断裂韧性及高、低周疲劳性能均满足技术标准要求,且各项力学性能匹配良好。
The effect of heat treatment on the microstructure and mechanical properties of TC17 alloy after β forging was studied by changing the aging temperature and the heat treatment system was selected according to its service requirements. The results show that the size of lamellar α-phase bundles increases with the increase of aging temperature,the orientation relation becomes simple,the content of β-transformation increases,the strength,hardness and fracture toughness of the alloy increase,but the plasticity decreases. The fracture toughness is better when heating at 800 ℃ for 4 h,water cooling,and then aging at 660 ℃ for 8 h,air cooling,and the high and low cycle fatigue properties meet the technical requirements.
出处
《金属热处理》
CAS
CSCD
北大核心
2018年第1期171-174,共4页
Heat Treatment of Metals
关键词
TC17钛合金
热处理
显微组织
力学性能
TC17 titanium alloy
heat treatment
microstructure
mechanical property
