Effect of Notch Stress Concentration Factors on Low-cycle Fatigue Performance of TC4 ELI Alloy

doi:10.11901/1005.3093.2022.315

Chinese Journal of Materials Research

2023, Vol. 37

Issue (7): 511-522 DOI: 10.11901/1005.3093.2022.315

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Effect of Notch Stress Concentration Factors on Low-cycle Fatigue Performance of TC4 ELI Alloy

LIU Tianfu¹, ZHANG Bin¹(

), ZHANG Junfeng², XU Qiang³, SONG Zhuman⁴, ZHANG Guangping⁴

^1.Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, School of Materials Science and Engineering, Northeastern University, Shengyang 110819, China
^2.Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
^3.China Ship Scientific Research Center, Wuxi 214082, China
^4.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Cite this article:

LIU Tianfu, ZHANG Bin, ZHANG Junfeng, XU Qiang, SONG Zhuman, ZHANG Guangping. Effect of Notch Stress Concentration Factors on Low-cycle Fatigue Performance of TC4 ELI Alloy. Chinese Journal of Materials Research, 2023, 37(7): 511-522.

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Abstract

The low-cycle fatigue behavior of TC4 ELI (Extra-low-interstitial) alloy plates for pressure shells in deep-sea submersible with different notch stress concentration factors under constant total strain amplitude was investigated. The results indicate that cyclic harding and cyclic softening occur in the smooth specimens under the lower strain amplitude (≤0.7%) and higher strain amplitudes (0.8% and 0.9%), respectively, at the initial stage of the cyclic loading. While the cyclic hardening occurs in all the notched specimens under the strain amplitudes of 0.2% to 0.7% at the initial stage of the cyclic loading. Based on the variation of material hysteretic energy under the cyclic loading, a relative crack initiation life prediction model was established to describe the damage degree of TC4ELI alloy specimens under the low cycle fatigue loading. The relationship between notch stress concentration factors and low cycle fatigue performance parameters was also described. This model can effectively predict the relative fatigue crack initiation life of TC4ELI alloy with low notch stress concentration factor under high strain amplitude conditions.

Key words: metallic material TC4 ELI alloy low cycle fatigue notch Stress concentration factor fatigue life

Received: 07 June 2022

ZTFLH:

TB31

Fund: National Natural Science Foundation of China(51971060);National Natural Science Foundation of China(52171128)

Corresponding Authors: ZHANG Bin, Tel: (024) 83691585, E-mail: zhangb@atm.neu.edu.cn

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	LIU Tianfu
	ZHANG Bin
	ZHANG Junfeng
	XU Qiang
	SONG Zhuman
	ZHANG Guangping

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https://www.cjmr.org/EN/10.11901/1005.3093.2022.315 OR https://www.cjmr.org/EN/Y2023/V37/I7/511

Table 1 Nominal composition of TC4 ELI alloy (%, mass fraction)

Fig. 1 Dimensions and surface finish of TC4 ELI specimens with different notch stress concentration factors for low-cycle fatigue tests (a) K_t =1, (b) K_t =1.97, (c) K_t =2.64, (d) K_t =3.62

Fig.2 Optical image of rolled TC4 ELI alloy

Fig.3 Stress amplitude of TC4 ELI alloy with different notched stress concentration coefficient varies with cycle number (a) K_t =1, (b) K_t =1.97, (c) K_t =2.64, (d) K_t =3.62

Fig.4 Fatigue hysteresis loops of TC4 ELI specimens with different notch stress concentration factors (a) K_t =1, (b) K_t =1.97, (c) K_t =2.64, (d) K_t =3.62

Fig.5 SEM images of fatigue fracture surfaces of TC4 ELI alloy smooth specimens under the control of different strain amplitudes (a, c, e, g) 0.4%, (b, d, f, h) 0.9%

Fig.6 SEM images of fatigue fracture surfaces of TC4 ELI alloy notched specimens with three different notch stress concentration factors under the control of strain amplitude of 0.3% (a, d, g) K_t =1.97, (b, e, h) K_t =2.64, (c, f, i) K_t =3.62

Fig.7 TEM images of fatigue fracture surfaces of TC4 ELI alloy smooth specimens under control of different strain amplitudes (a~c) 0.4%, (d~f) 0.9%

Fig.8 Fitting curves of stress amplitude and plastic strain amplitude of TC4 ELI alloy with different notch stress concentration factors (a), Variations of cyclic strength coefficient and cyclic strain hardening exponent (b) of TC4 ELI alloy with notch stress concentration factor

Table 2 Fatigue performance parameter of TC4 ELI alloy with different notch stress concentration factors

Fig.9 Relationships between hysteresis energy and relative cycles of TC4 ELI alloy smooth specimen under total strain amplitude of 0.9% (a), corresponding hysteretic loops of the five reference points in figure (a) (b)

Fig.10 Relation diagram between hysteresis energy and relative cycle of alloy (a) K_t =1, (b) K_t =1.97, (c) K_t =2.64, (d) K_t =3.62, (e) the relationships between relative fatigue crack initiation life and Δε_t /2, (f) the relationships between relative fatigue crack initiation life and K_t

Fig.11 Relationships between relative fatigue crack initiation life and total strain amplitude of TC4 ELI alloy

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