引用本文: | 张鑫,熊毅,陈正阁,岳赟,武永丽,任凤章.疲劳试验温度对TC11钛合金表面纳米化后的组织和性能的影响∗[J].中国表面工程,2021,34(2):76~85 |
| Zhang Xin,Xiong Yi,Chen Zhengge,Yue Yun,Wu Yongli,Ren Fengzhang.Effect of Fatigue Test Temperature on Microstructure and Properties of TC11 Titanium Alloy after Surface Nanocrystallization[J].China Surface Engineering,2021,34(2):76~85 |
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摘要: |
在不同温度(-30 ℃ ,25 ℃ ,150 ℃ )下对超音速微粒轰击(SFPB)表面强化后的 TC11 钛合金进行高周疲劳试验,并借助扫描电镜(SEM)、透射电镜(TEM)、X 射线衍射仪(XRD)等试验手段研究了不同疲劳试验温度下的断口及断口附近的微观组织。 结果表明:超音速微粒轰击后,TC11 钛合金构件表层形成晶粒尺寸约为 10 nm、层厚为 30 ~ 50 μm 的梯度纳米组织;不同温度下高周疲劳试验后,钛合金构件表层组织的晶粒尺寸仍处于纳米量级,平均尺寸与疲劳加载前相当;超音速微粒轰击强化使得钛合金构件疲劳裂纹源萌生位置由表层移至次表层,不同温度下的疲劳断口均由疲劳源区、裂纹扩展区、瞬断区三部分组成,疲劳条带宽度随着试验温度的升高而增大。 |
关键词: 超音速微粒轰击 TC11 钛合金 梯度纳米结构 疲劳条带 |
DOI:10.11933/j.issn.1007-9289.20210111001 |
分类号:TG146 |
基金项目:国家自然科学基金 (U1804146,51801054)、河南省高校科技创新人才支持计划 (17HASTIT026)、河南省外国专家与引智(HNGD2020009) 和河南科技大学科技创新团队(2015XTD006)资助项目 |
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Effect of Fatigue Test Temperature on Microstructure and Properties of TC11 Titanium Alloy after Surface Nanocrystallization |
Zhang Xin1, Xiong Yi1,2, Chen Zhengge3, Yue Yun1, Wu Yongli1, Ren Fengzhang1,2
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1.School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023 , China;2.Collaborative Innovation Center of New Nonferrous Metal Materials and Advanced Processing Technology Jointly Established by Ministry of Science and Technology, Luoyang 471023 , China;3.State Key Laboratory of Laser Interaction with Matter,Northwest Institute of Nuclear Technology, Xi’an 710024 , China
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Abstract: |
The high cycle fatigue experiments of TC11 titanium alloy strengthened by supersonic fine particles bombarded (SFPB) were carried out at different temperatures (-30 ℃ , 25 ℃ , 150 ℃ ). The fatigue fracture morphology and microstructure evolution at differ- ent fatigue test temperatures were investigated by means of scanning electron microscopy ( SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). Results show that gradient nanostructured layer with a thickness of 30~ 50 μm is formed on the surface of TC11 titanium alloy after SFPB treatment and the average grain size is about 10 nm. After high cycle fatigue testing at differ- ent temperatures, the grain size of surface layer still remains in the nanometer scale, which is similar to that before fatigue testing. Sur- face hardening of TC11 titanium alloy induced by SFPB treatment causes the change of crack initiation site from surface to subsurface layer. The fatigue fracture morphology of TC11 titanium alloy is composed of three parts: fatigue source zone, crack growth zone andinstantaneous fracture zone. In particular, the fatigue stripe width increases with the increase of fatigue test temperatures. |
Key words: supersonic fine particle bombardment TC11 titanium alloy gradient nanostructure fatigue striation |