Evaluation of Fatigue Limit Improvement and Harmless Crack Size of Maraging Steel Using Shot Peening

Abstract:

The fatigue strength of maraging steel, which is an ultra-high-strength steel, is relatively low, compared to that of conventional high-strength steel. The fatigue life of a structure is highly dependent on the surface conditions, because fatigue cracks generally start at the surface of the material. In particular, surface cracks considerably degrade the fatigue limit. To expand the application range of maraging steel, it is necessary to improve the fatigue limit, and render the surface cracks harmless. This study aims to investigate the effect of shot peening (SP) on the fatigue strength of maraging steel with surface cracks. The SP application introduced a compressive residual stress from the specimen surface to a depth of 170 μm, and increased the fatigue limit by 77 %. The estimated crack size that can be rendered harmless, based on fracture mechanics, is (0.170 − 0.202) μm in the range As = (1.0 − 0.1). The intersections of the harmless crack sizes were determined at depth. A semicircular surface crack below this value is harmless in terms of fatigue limit. The usefulness of non-destructive inspection (NDI) and non-damaging technology was evaluated in relation to a_hml, a_NDI, a_25,50, and As. Thus, the SP process can improve the reliability of the maraging steel. Compressive residual stress is the dominant factor to improve fatigue strength and render the surface crack harmless.

• Periodical: Key Engineering Materials (Volume 981)
• Pages: 33-42
• DOI: https://doi.org/10.4028/p-UcZ3th
• Online since: May 2024
• Authors: Seo Hyun Yun, Ho Seok Nam, Ki Woo Nam*
• Keywords: Compressive Residual Stress, Harmless Crack Size, Maraging Steel, Nondestructive Inspection, Shot Peening

References

[1] W. Sha, Z. Guo, Maraging Steels, Woodhead Publishing, (2009).

[2] F. Habiby, A.ul Haq, A. Q. Khan, The properties and applications of 18% Nickel Maraging Steels, Materials Technology, 9 (1994) 246-252.

DOI: 10.1080/10667857.1994.11785084

[3] M. N. Rao, Progress in understanding the metallurgy of 18% nickel maraging steels, International Journal of Materials Research, 97 (2006) 1594-1607

DOI: 10.3139/146.101418

[4] B. Rihit, N. R. Muktinutalapati, Fatigue Behavior of 18% Ni Maraging Steels: A Review, Journal of Materials Engineering and Performance, 30 (2021) 2341–2354.

DOI: 10.1007/s11665-021-05583-w

[5] W. Wang, W. Yan, Q. Duan, Y. Shan, Z. Zhang, K. Yang, Study on fatigue property of a new 2.8GPa grade maraging steel, Materials Science and Engineering A, 527 (2010) 3057-3063.

DOI: 10.1016/j.msea.2010.02.002

[6] L. pollock, A. K. Abdelwahab, J. Murray, G. Wild, The Need for Aerospace Structural Health Monitoring: A Review of Aircraft Fatigue Accidents, International Journal of Prognostics and Health Management, 12 (2021) 1-16.

DOI: 10.36001/ijphm.2021.v12i3.2368

[7] B. Zhao, J. Song, L. Xie, H. Zhiyong, C. Jianpeng, Surface roughness effect on fatigue strength of aluminum alloy using revised stress field intensity approach, Scientific Reports, 11 (2021) 19279.

DOI: 10.1038/s41598-021-98858-0

[8] T. Childerhouse, R. M'Saoubi, L. Franca, N. Weston, O. Crawforth, The influence of machining induced surface integrity and residual stress on the fatigue performance of Ti-6Al-4V following polycrystalline diamond and coated cemented carbide milling, International Journal of Fatigue, 163 (2022) 107054.

DOI: 10.1016/j.ijfatigue.2022.107054

[9] M. Kattoura, A. Telang, S. R. Mannava, D. Qian, V. K. Vasudevan, Effect of Ultrasonic Nanocrystal Surface Modification on Residual Stress, Microstructure and Fatigue Behavior of ATI 718Plus Alloy, Materials Science and Engineering A, 711 (2018) 364-377.

DOI: 10.1016/j.msea.2017.11.043

[10] D. Kumar, S. Idapalapati, W. Wei, Microstructural Response and Strain Hardening in Deep Cold Rolled Nickel based Superalloy for Aerospace Application, Procedia CIRP, 71 (2018) 374-379.

DOI: 10.1016/j.procir.2018.05.044

[11] JIS B 2711, Shot Peening, (2005).

[12] H. Soyama, Comparison between the improvements made to the fatigue strength of stainless steel by cavitation peening, water jet peening, shot peening and laser peening, Journal of Materials Processing Technology, 270 (2019) 381-382.

DOI: 10.1016/j.jmatprotec.2019.03.008

[13] T. Tsuji, M. Fujino, K. Takahashi, Fatigue Limit Improvement and Rendering Surface Defects Harmless by Shot Peening for carburized Steel, Metals, 13 (2023) 42.

DOI: 10.3390/met13010042

[14] K. W. Nam, M. H. Kim, K. H. Gu, C. Y. Park, Rendered Harmless of Surface Crack with Different Crack Aspect Ratio in Ultrasonic Peened STS316L Steel, Trans. Korean Soc. Mech. Eng. A, 45 (2021) 629-635.

DOI: 10.3795/ksme-a.2021.45.8.629

[15] M. H. Kim, W. G. Lee, C. S. Kim, K. Takahashi, M. Handa, K. W. Nam, Evaluation of Fatigue Limit and Harmless Crack Size of Needle Peened Offshore Structure Steel F690, Journal of Mechanical Science and Technology, 35 (2021) 3855-3862.

DOI: 10.1007/s12206-021-2109-4

[16] S.H. Park, K.H. Gu, G.H. Lee, K.W. Nam, Evaluation of Harmless Crack Size of A6061-T6 for EV Battery Pack Case," Trans. Korean Soc. Mech. Eng. A, 47 (2023) 417-425.

DOI: 10.3795/ksme-a.2023.47.5.417

[17] S. Tsuchiya, K. Takahashi, Rendering Defects Harmless through Laser Peening in Additive Manufactured Maraging Steel, Metals, 12 (2022) 49.

DOI: 10.3390/met12010049

[18] A. Casagrande, G. P. Cammarota, L. Micele, Relationship between fatigue limit and Vickers hardness in steels, Materials Science and Engineering A, 528 (2011) 3468-3473.

DOI: 10.1016/j.msea.2011.01.040

[19] M. Nakagawa, K. Takahashi, T. Osada, H. Okada, H. Koike, Improvement in fatigue limit by shot peening of high-strength steel containing crack-like surface defect (infuence of surface crack aspect ratio), Jpn. Soc. Spring Eng., 2014 (2014) 13-18.

DOI: 10.1115/pvp2013-97839

[20] J.C. Newman Jr, I.S. Raju, An empirical stress-intensity factor equation for the surface crack, Engineering Fracture Mechanics, 15 (1981) 185-192.

DOI: 10.1016/0013-7944(81)90116-8

[21] American Petroleum Institute, Recommended Oractice579, Fitness for Service, American Petroleum Institute, (2000) C3-C10.

[22] K. Ando, R. Fueki, K. W. Nam, K. Matsui, K. Takahashi, A Study on the unification of the threshold stress intensity factor for micro crack growth, Japan Society of Spring Engineers. 64 (2019) 39-44.

DOI: 10.5346/trbane.2019.39

[23] H. Kitagawa, S. Takahashi, Applicability of fracture mechanics to very small cracks or the cracks in the early stage, In: Proc. 2nd Intern. Conf. Mech. Behav. Mater., Boston, ASM, Cleveland, Ohio, (1976) 627-631.

[24] A. Tange, T. Akutu, N. Takamura, 1991, "Relation between shot-peening residual stress distribution and fatigue crack propagation life in spring steel", Transactions of JSSE, 1991 (1991) 47-53.

DOI: 10.5346/trbane.1991.47