Effect of Corrosion Damage on Fatigue Behavior of AA7075-T651 Al-alloy

doi:10.11902/1005.4537.2021.123

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (3): 486-492 DOI: 10.11902/1005.4537.2021.123

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Effect of Corrosion Damage on Fatigue Behavior of AA7075-T651 Al-alloy

WENG Shuo¹^,²^,³(

), YU Jun¹, ZHAO Lihui¹^,²^,³, FENG Jinzhi¹^,²^,³, ZHENG Songlin¹^,²^,³

^1.School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
^2.Key Laboratory of Strength and Reliability Evaluation of Auto Mechanical Components for Mechanical Industry, Shanghai 200093, China
^3.Shanghai Public Technology Platform for Reliability Evaluation of New Energy Vehicles, Shanghai 200093, China

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Abstract

The fatigue test for the 7075-T651 Al-alloy samples with and without being immersed in 3.5% (mass fraction) NaCl solution for 150 and 500 h, respectively, was carried out, in order to reveal the influence of corrosion damage on the fatigue behavior of the alloy. The results show that compared to the blank alloy samples, the fatigue life of 7075-T651 Al-alloy subjected to immersion corrosion is significantly reduced due to the presence of corrosion damage. The size of corrosion pits in the specimens immersed for 500 h are much large than those for 150 h, but the fatigue life of the two types of specimens with corrosion damage are more or less at the same stress level. Based on the fatigue notch coefficient theory and Stromeyer three-parameter S-N curve formula, the life of the damaged Al-alloy sample was predicted, and the predicted results totally located in the double dispersion band, which indicates that the predicted formula fits well with the results of experimental results.

Key words: corrosion damage fatigue life AA7075-T651Al-alloy

Received: 31 May 2021

ZTFLH:

TG146.2

Fund: National Natural Science Foundation of China(52005336);China Postdoctoral Science Foundation(2020M671167);Shanghai Sailing Program(19YF1434400)

Corresponding Authors: WENG Shuo E-mail: wengshuo@usst.edu.cn

About author: WENG Shuo, E-mail: wengshuo@usst.edu.cn

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Cite this article:

WENG Shuo, YU Jun, ZHAO Lihui, FENG Jinzhi, ZHENG Songlin. Effect of Corrosion Damage on Fatigue Behavior of AA7075-T651 Al-alloy. Journal of Chinese Society for Corrosion and protection, 2022, 42(3): 486-492.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2021.123 OR https://www.jcscp.org/EN/Y2022/V42/I3/486

Fig.1 Optical Microstructure of AA7075-T651 Al-alloy

Fig.2 Detailed sizes of sample used in fatigue tests

Fig.3 Surface corrosion morphologies on the surface of specimens after 500 h: (a) T-L plane; (b) T-S plane, (c) local enlargement on the T-S plane

Fig.4 Cross-sectional morphologies of the specimens after 500 h: (a) macroscopic morphology, (b) local enlargement of T-L plane, (c) local enlargement of T-S plane

Fig.5 S-N curve of fatigue specimens with different immersion times

Table 1 S-N curve equation and material constants

Fig.6 Fracture morphology of the as-received sample crack initiating on the T-L plane (a~d) and at the geometric corner of the original sample (e~h): (a, e) macroscopic fracture morphology; (b, f) crack initiation zone with the direction on the T-L surface; (c, g) crack propagation zone; (d, h) ductile fracture zone

Fig.7 Fracture morphology of 150 h (a~d) and 500 h (e~h) pre-etched sample: (a) macroscopic fracture morphology; (b) T-S surface crack initiation zone; (c) crack propagation zone; (d) ductile fracture zone, (e) macroscopic fracture morphology; (f) corrosion pit initiation zone; (g) fatigue striations; (h) ductile fracture zone

Fig.8 Crack initiation location statist

Table 2 Corrosion pit geometrical dimension parameters

Fig.9 Comparison of predicted life with experimental data

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