Browse > Article
http://dx.doi.org/10.21289/KSIC.2022.25.2.239

Peculiar Fatigue Fracture Behavior of Ultrasonic Nanocrystal Surface Modified SCM435  

Kim, Jae-Hoon (Dept. of Materials Science and Engineering, Pukyong National University)
Yun, Seo-Hyun (Dept. of Die Mold System, Changwon Campus of Korea Polytechinics)
Nam, Ki-Woo (Dept. of Materials Science and Engineering, Pukyong National University)
Publication Information
Journal of the Korean Society of Industry Convergence / v.25, no.2_2, 2022 , pp. 239-245 More about this Journal
Abstract
Using the fatigue limit (∆σunsm) and residual stress (σr) of the UNSM smooth specimen, the harmless maximum crack depth (ahlm) according to the crack aspect ratio (As) was evaluated. In addition, the relationship between the minimum crack depth (aNDI1, aNDI2) detectable by non-destructive inspection(NDI), the crack depth (a25, a50) that reduces the fatigue limit by 25% and 50%, and ahlm were evaluated. The harmless crack condition was determined by the deepest crack point (point A). Since ahlm is larger than a25 and a50, a25 and a50 can secure the safety and reliability of steel via UNSM. Because aNDI1 and aNDI2 are larger than a25 and a50, cracks in a25 and a50 cannot be detected by non-destructive testing. Therefore it is necessary to apply more precise NDI.
Keywords
Crack Depth Detectable by NDI; Harmless Crack Depth; Ultrasonic Nanocrystal Surface Modification; Peculiar Fatigue Fracture;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 W. D. Rummel, P. H. Todd Jr, S. A. Frecska, and R. A. Rathke, "The Detection of Fatigue Cracks by Nondestructive Testing Methods," NASA Technical Report, NASA-CR-2369, (1974).
2 Y. Mizutani, "Nondestructive inspection of metal fatigue," Industrial Materials (Japan). vol. 56, pp. 86-89, (2008).
3 American Petroleum Institute, "API recommended practice 579 fitness for service", American Petroleum Institute, pp. C3-C10, (2000).
4 S. Tekeli, "Enhancement of fatigue strength of SAE 9245 steel by shot peening," Materials Letters, vol. 57, pp. 604-608, (2002).   DOI
5 M. S. Suh, C. M. Suh, and Y. S. Pyun, "Very high cycle fatigue characteristics of a chrome-molybdenum steel treated by ultrasonic nanocrystal surface modification technique," Fatigue & Fracture of Engineering Materials & Structures, vol. 36, pp. 769-778, (2013).   DOI
6 C. M. Suh, M. H. Lee, and Y. S. Pyun, "Fatigue characteristics of SKD-61 by ultrasonic nanocrystal surface modification technnology under static load variation," International Journal of Modern Physics B, vol. 24, pp. 2645-2650, (2010).   DOI
7 P. Paris, and F. Erdogan, "A critical analysis of crack propagation laws," ASME Journal of Basic Engineering. vol. 85, pp. 528-533, (1963).   DOI
8 A. Tange, T. Akutu, and N. Takamura, "Relation between shot-peening residual stress distribution and fatigue crack propagation life in spring steel," Transactions of JSSE, vol. 1991, pp. 47-53, (1991).   DOI
9 K. W. Nam, "Life prediction of fatigue crack propagation and nondestructive evaluation in 5083 aluminum alloy," Journal of Ocean Engineering and Technology, vol. 15, pp. 94-98, (2001).
10 A. Alshoaibi, M. Ghazwani, and M. Hakami, "Fatigue life and reliability assessment of metal structures," Engineering Solid Mechanics, vol. 9, pp. 13-22, (2021).
11 K. Ando, R. Fueki, K. W. Nam, K. Matsui, and K. Takahashi, "A study on the unification of the threshold stress intensity factor for micro crack growth," Japan Society of Spring Engineers, vol. 64, pp. 39-44, (2019).
12 S. H. Yun, K. W. Nam, "Failure Analysis and Counter measures of SCM435 High-Tension Bolt of Three-Step Injection Mold", Journal of The Korean Society of Industry Convergence, Vol. 23, No. 4, pp. 531-539, (2020).   DOI
13 Y. Kondo, C. Sakae, M. Kubota, and T. Kudou, "The effect of material hardness and mean stress on the fatigue limit of steels containing small defects," Fatigue & Fracture of Engineering Materials & Structures, vol. 26, pp. 675-682, (2003).   DOI
14 M. H. EI Haddad, T. H. Topper, and K. N. Smith, "Prediction of non-propagating cracks," Engineering Fracture Mechanics, vol. 11, pp. 573-584, (1979).   DOI
15 M. H. Kim, J. Y. Hyun, and K. W. Nam, "Evaluation of harmless crack size using Ando's equation," Journal of Mechanical Science and Technology, vol. 34, pp. 1971-1977, (2020).   DOI
16 C. Y. Park, K. H. Gu, and K. W. Nam, "Reliability improvement for fatigue characteristics of STS316L steel using surface crack non-damaging technology," Trans. Korean Soc. Mech. Eng. A, vol. 45, pp. 741-749, (2021).   DOI
17 S. G. Irizalp, N. Saklakoglu, F. Baris, and S. Kayral, "Effect of shot peening on residual stress distribution and microstructure evolution of artificially defected 50CrV4 steel," Journal of Materials Engineering and Performance, vol. 29, pp. 7607-7616, (2020).   DOI
18 J. C. Newman Jr., and I. S. Raju, "An Empirical Stress-Intensity Factor Equation for the Surface Crack," Engineering Fracture Mechanics, vol. 15, pp. 185-192, (1981).   DOI