Fatigue Properties and Crack Growth Behavior of ML40Cr Steel for 8.8-grade Bolts

doi:10.11901/1005.3093.2019.207

Chinese Journal of Materials Research

2019, Vol. 33

Issue (10): 771-775 DOI: 10.11901/1005.3093.2019.207

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Fatigue Properties and Crack Growth Behavior of ML40Cr Steel for 8.8-grade Bolts

WANG Yuanchen¹,SONG Zhuman¹,LI Rui²,SHI Wenbo³,ZHU Yankun¹,ZHANG Guangping¹(

)

1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. Zhejiang Huadian Equipment Testing Institute Co. Ltd. , Hangzhou 310015, China
3. Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

Cite this article:

WANG Yuanchen,SONG Zhuman,LI Rui,SHI Wenbo,ZHU Yankun,ZHANG Guangping. Fatigue Properties and Crack Growth Behavior of ML40Cr Steel for 8.8-grade Bolts. Chinese Journal of Materials Research, 2019, 33(10): 771-775.

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Abstract

ML40Cr steel for 8.8-grade bolts of power transmission towers was selected as research object in this paper. Considering the fatigue reliability of the bolts fastened under different pre-stresses, tension-tension fatigue and symmetric three-point bending experiments were conducted to investigate the fatigue properties and fatigue crack propagation behavior of ML40Cr steel samples, respectively. The experimental results show that the fatigue limits for smooth samples and notched samples of the ML40Cr steel are 263 MPa and 95 MPa, respectively when the 50% of tensile strength was adopted as the mean stress with different stress amplitudes. The effect of the mean stress on the stress-fatigue life (S-N) curve of the ML40Cr steel samples was investigated by the effective stress method and the corresponding fatigue notch sensitivity 0.31 was obtained. According to the results of symmetrical three-point bending tests the Paris formula of ML40Cr steel for 8.8 bolts is fitted as $d a / d N = 10 - 10 ? K 2.2$ . Mechanisms of notch fatigue strength and crack growth of the ML40Cr steel for the bolts were also discussed.

Key words: materials failure and protection fatigue properties notch sensitivity crack growth grade 8.8 bolts

Received: 20 April 2019

ZTFLH:

TM752

Fund: Zhejiang Science and Technology Project(5211HD180005)

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	Yuanchen WANG
	Zhuman SONG
	Rui LI
	Wenbo SHI
	Yankun ZHU
	Guangping ZHANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.207 OR https://www.cjmr.org/EN/Y2019/V33/I10/771

Table 1 Chemical composition of 8.8 grade bolt (mass fraction, %)

Fig.1 Dimensions of smooth fatigue specimen (a), notched fatigue specimen (b) and single-edge notched specimen (c) (unit: mm)

Fig.2 Optical image of microstructure

Fig.3 S-N curves of smooth and notched samples

Fig.4 Fatigue fracture of smooth and notched specimens (a) crack initiation region and (b) propagation region of smooth specimen, (c) crack initiation region and (d) propagation region of notched specimen

Fig.5 Relationship of fatigue crack growth rate and stress intensity factor range at the crack tip

Fig.6 Curve of effective stress versus fatigue life

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