显微组织对TB17钛合金高周疲劳性能的影响
Influence of Microstructures on High Cycle Fatigue Properties of TB17 Titanium Alloy
商国强 1张晓泳 2王新南 3李超 4甘雪萍 2朱知寿 3周科朝2
作者信息
- 1. 中南大学粉末冶金国家重点实验室,湖南长沙 410083;中国航发北京航空材料研究院先进钛合金航空科技重点实验室,北京 100095
- 2. 中南大学粉末冶金国家重点实验室,湖南长沙 410083
- 3. 中国航发北京航空材料研究院先进钛合金航空科技重点实验室,北京 100095
- 4. 湖南金天钛业科技有限公司湖南省高端装备特种钛合金工程技术研究中心,湖南常德 415001
- 折叠
摘要
对比研究了 TB17钛合金3种典型组织形态(双态组织、网篮组织和片层组织)对其高周疲劳性能的影响,并分析了高周疲劳断口形貌.结果表明:双态组织特征的TB17钛合金具有最高的强塑性匹配水平,但其疲劳寿命与应力呈双线性关系,疲劳性能并不稳定;网篮组织的强塑性稍差,但具有最高的疲劳强度和疲劳比;片层组织的疲劳强度比网篮组织略低,但其疲劳比和拉伸塑性最差.高周疲劳加载应力处于低应力状态时,疲劳裂纹倾向于试样内部、单源萌生,而处于高应力状态时,疲劳裂纹倾向于试样表面、多源萌生.网篮组织存在更多的二次裂纹,且疲劳条带更为清晰密集,裂纹扩展路径更曲折,在扩展时消耗的能量更多.
Abstract
The effects of three typical microstructures(bi-modal microstructure,basketweave microstructure and lamellar microstructure)on the high cycle fatigue properties of TB17 titanium alloy were studied,and the high cycle fatigue fracture morphology was analyzed.The results show that the TB17 titanium alloy with bimodal microstructure has the highest matching level of strength and plasticity,but its fatigue life has a bilinear relationship with stress,and its fatigue performance is not stable.The strength and plasticity of the TB17 alloy with basketweave structure are slightly worse,but it has the highest fatigue strength and fatigue ratio.The fatigue strength of the TB17 alloy with lamellar structure is slightly lower than that of the alloy with basketweave structure,but its fatigue ratio and tensile plasticity are the worst.When the high-cycle fatigue loading stress is in a low stress state,fatigue crack is prone to initiate inside the specimen and from a single source;however,when it is in a high stress state,the fatigue crack tends to initiate on the surface of the sample and from multi-source.In the basketweave microstructure,more secondary cracks appear,the fatigue bands are clearer and denser,the crack propagation path is more tortuous,and more energy is consumed during propagation than the cases in the other microstructures.
关键词
TB17钛合金/高周疲劳/疲劳断口/显微组织Key words
TB17 titanium alloy/high cycle fatigue/fatigue fracture/microstructure引用本文复制引用
基金项目
装备预先研究项目(51312030507)
装备预先研究项目(51312JQ01)
装备预先研究项目(41422010501)
出版年
2024
NETL
NSTL
万方数据