Cut-Off Value of Detail Fatigue Rated Strength of TC4 Titanium Alloy with Compound Strengthening Treatment by Laser Shock Peening and Shot Peening

Yapeng Liu; Zhijun Shi; Yizhao Zhao; Liang Zhu; Mabao Liu

doi:10.3788/CJL202047.0502006

Chinese Journal of Lasers, Volume. 47, Issue 5, 0502006(2020)

Cut-Off Value of Detail Fatigue Rated Strength of TC4 Titanium Alloy with Compound Strengthening Treatment by Laser Shock Peening and Shot Peening

Yapeng Liu^1,2, Zhijun Shi³, Yizhao Zhao^1,2, Liang Zhu³, and Mabao Liu^1,2,4、*

Author Affiliations

¹School of Aerospace Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China

²State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University,Xi'an, Shaanxi 710049, China

³The First Aircraft Design and Research Institute, Aviation Industry Corporation of China,Xi'an, Shaanxi 710089, China

⁴Shaanxi Key Laboratory of Advanced Aircraft Service Environment and Control,Xi'an, Shaanxi 710049, China

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Figures & Tables(14)

Fig. 1. Schematic of fatigue specimen

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Fig. 2. Areas of shot peening and laser shock peening

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Fig. 3. Distribution of surface residual stress in different strengthened samples

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Fig. 4. DFR_cutoff of TC4 titanium under different strengthening conditions

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$Fatigue fracture morphology of different strengthened TC4 titanium alloy specimens. (a) None; (b) SP; (c) LSP; (d) LSP+SP$

Fig. 5. Fatigue fracture morphology of different strengthened TC4 titanium alloy specimens. (a) None; (b) SP; (c) LSP; (d) LSP+SP

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Fig. 6. Fatigue crack length of different strengthened TC4 titanium alloy specimens

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Fig. 7. Loading curve of laser shock peening

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Fig. 8. Mesh model and local mesh refinement

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Fig. 9. Residual stress distribution in three kinds of strengthened TC4 titanium alloy samples. (a) SP; (b) LSP; (c) LSP+SP

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Fig. 10. Distribution of residual stressin three kinds of strengthened TC4 titanium alloy samples along thickness direction

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Table 1. Chemical composition of TC4 titanium alloy
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Table 1. Chemical composition of TC4 titanium alloy
Component Fe C N H O Al V Ti
Mass fraction /% ≤0.30 ≤0.10 ≤0.05 ≤0.015 ≤0.20 5.5--6.8 3.5--4.5 Bal.

Table 2. Mechanical properties of TC4 titanium alloy
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Table 2. Mechanical properties of TC4 titanium alloy
Tensile strengthσ_b /MPa Yield strengthσ_0.2 /MPa Elongationδ /% Elasticity modulusE /GPa Density ρ /(kg·m^-3) Poisson'sratio ν
1012 875 180.5 110 4500 0.34

Table 3. Fatigue test results of TC4 titanium alloy under different technological conditions

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Table 3. Fatigue test results of TC4 titanium alloy under different technological conditions

SpecimenNo.	Strengtheningcondition	F_max /kN	Fatiguelife /cycle	Characteristiclife /cycle
1-1	None	58	196402	292082
		1-2		242423
		1-3		122885
		1-4		139483
		1-5		159143
		1-6		258084
		1-7		76924
		1-8		178027
2-1	SP	64	119945	241393
		2-2		238465
		2-3		229230
		2-4		408671
		2-5		172887
		2-6		135148
		2-7		224636
		2-8		215396
3-1	LSP	75	265468	288220
		3-2		395080
		3-3		220273
		3-4		303785
		3-5		185149
		3-6		263124
4-1	LSP+SP	80	275190	448980
		4-2		523799
		4-3		474698

Table 4. J-C constitutive model parameters of TC4 titanium alloy
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Table 4. J-C constitutive model parameters of TC4 titanium alloy
Material A /MPa B /MPa C n m
TC4 875 793 0.01 0.386 0.71

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Yapeng Liu, Zhijun Shi, Yizhao Zhao, Liang Zhu, Mabao Liu. Cut-Off Value of Detail Fatigue Rated Strength of TC4 Titanium Alloy with Compound Strengthening Treatment by Laser Shock Peening and Shot Peening[J]. Chinese Journal of Lasers, 2020, 47(5): 0502006

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