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Chinese Journal of Materials Research  2016, Vol. 30 Issue (4): 299-306    DOI: 10.11901/1005.3093.2015.353
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The Influence of Fe on the Mechanical Properties of Ti-6Al-4V ELI Alloy
LIANG Enquan1, HUANG Sensen2,3, MA Yingjie3,*(), ZHANG Ren1, LEI Jiafeng3, LIU Yang1
1. Shanghai Aircraft Design and Research Institute, Commercial Aircraft Corporation of China, Ltd, Shanghai 200232, China
2. Institute of Material and Metallurgy, Northeast University, Shenyang 110819, China
3. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Cite this article: 

LIANG Enquan, HUANG Sensen, MA Yingjie, ZHANG Ren, LEI Jiafeng, LIU Yang. The Influence of Fe on the Mechanical Properties of Ti-6Al-4V ELI Alloy. Chinese Journal of Materials Research, 2016, 30(4): 299-306.

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Abstract  

The effect of different Fe contents (0.03%, 0.17%, 0.24%) on the mechanical properties of Ti-6Al-4V ELI (TC4 ELI) alloy was studied. The microstructures were characterize by using EBSD, and the tensile properties, fracture toughness and fatigue crack growth rates (da/dN), creep properties of TC4 ELI with three Fe contents were compared and analyzed. The results showed that with the increase of Fe contents, Fe has no apparent influence on fracture toughness, however, tensile strength of the alloy was improved. The da/dN of the three TC4 ELI alloys were found to be almost identical at room temperature and 200℃, however da/dN was found to be marginally faster as Fe contents increased at 400℃. Within the range of 250~350℃, Fe improved creep resistance, while from 350℃ to 400℃, Fe had opposite effect. Fe atom was mainly enriched in β phase. And the tensile strength was improved with the increase of Fe contents due to the solid solution strengthening effect. Because of the high diffusing rates of Fe atom under the condition of 400℃, the movement of matrix atoms and interfaces were accelerated. So that, the resistance to dislocation motion in crack tip plastic zone was reduced, which led to higher da/dN. Under the condition of 350-400℃, Fe could improve the creep rate by speeding up the process of dislocation climbing, but the reinforcement is more important below 350℃ because of the weak diffusion.
Key words:  metallic materials      Ti-6Al-4V ELI      Fe content      fracture toughness      fatigue crack growth      creep     
Received:  24 June 2015     
ZTFLH:  TG146  
About author:  To whom correspondence should be addressed, Tel: 13840026329, E-mail: yjma@imr.ac.cn
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Enquan LIANG
Sensen HUANG
Yingjie MA
Ren ZHANG
Jiafeng LEI
Yang LIU

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.353     OR     https://www.cjmr.org/EN/Y2016/V30/I4/299

Sample Impurity Alloying element
Fe C N H O Al V Ti
No1 0.03 <0.01 <0.01 <0.001 0.06 6.00 4.14 Bal.
No2 0.17 <0.01 <0.01 <0.001 0.06 6.00 4.15 Bal.
No3 0.24 <0.01 <0.01 <0.001 0.06 5.99 4.14 Bal.
Table 1  The chemical compositions of three TC4ELI samples with different Fe contents (%, mass fraction)
Fig.1  Microstructures of three TC4 ELI alloys with different Fe contents, (a) No1, (b) No2, (c) No3
Fig.2  Crystal orientation distribution of No3 alloy
Fig.3  Statistical distribution of colony boundaries of No3 alloy
Fig.4  The content of Al, V, Fe in α/β phases of three TC4 ELI alloys, (a) No1 α phase, (b) No1 β phase, (c) No2 α phase, (d) No2 β phase, (e) No3 α phase, (f) No3 β phase
Fig.5  Line distribution of Fe content of No3 alloy
Sample Al V Fe
α β α β α β
No1 6.12 6.27 3.00 6.08 0.06 0.16
No2 6.31 6.47 3.71 5.91 0.23 0.58
No3 6.38 5.92 3.13 8.03 0.16 1.09
Table 2  Elements content in α/β phases of of TC4 ELI alloys with different Fe contents (%, mass fraction)
Fig.6  Tensile strength of TC4ELI alloys with different Fe contents at different temperatures
Sample PQ/ kN Pmax/ kN Kq/ MPam1/2
No1 66.6 72.4 116.3
No2 65.8 71.3 115.1
No3 66.1 71.3 115.5
Table 3  Fracture toughness of TC4ELI alloys with different Fe contents
Fig.6  Tensile strength of TC4ELI alloys with different Fe contents at different temperatures
Fig.7  da/dN curves of TC4ELI alloys with different Fe contents at room temperature
Fig.8  da/dN curves of TC4ELI alloys with different Fe contents at 200℃
Fig.9  da/dN curves of TC4ELI alloys with different Fe content at 400℃
Fig.10  Fracture morphology of crack propagation of TC4ELI alloys with different Fe contents at 400℃ (a) No1, (b) No2, (c) No3
Fig.11  Creep curves of No1 and No3 TC4 ELI alloys, (a) 400oC, (b) 350oC, (c) 300oC, (d) 250oC
Fig.12  Creep stress exponents of No1 and No3 TC4 ELI alloys at different temperatures, (a) 400oC, (b) 350oC, (c) 300oC, (d) 250oC
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