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

作　　者：商国强 张晓泳[1] 王新南 李超 甘雪萍[1] 朱知寿 周科朝[1] Shang Guoqiang;Zhang Xiaoyong;Wang Xinnan;Li Chao;Gan Xueping;Zhu Zhishou;Zhou Kechao(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China;Key Laboratory of Advanced Titanium Alloys,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;Hunan Engineering Technology Research Center in Special Titanium Alloys for High-End Equipment,Hunan Goldsky Titanium Industry Technology Co.,Ltd,Changde 415001,China)

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083 [2]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 [3]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

出　　处：《稀有金属材料与工程》2024年第2期529-536,共8页Rare Metal Materials and Engineering

基　　金：装备预先研究项目(51312030507,51312JQ01,41422010501)。

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。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 

分 类 号：TG146.23[一般工业技术—材料科学与工程]