Fatigue of Low Carbon Alloy Steel (JIS S45C) and a New Method of Fracture Surface Analysis

Abstract:

In this study, we observed cracks and fatigue surface of low carbon alloy steel (JIS, S45C)) in order to investigate the material structure and fatigue fracture surface. After fatigue crack growth tests of CT specimens, three-dimensional surface roughness of the fracture surface was studied using a laser confocal microscope (LCM). An image analysis method of Homology theory was applied to the LCM’s data. The Betti numbers, b1 were calculated at four points on the fracture surfaces in order to study the effect of asperity heights on the b1 values.Based on these analyses, we found the relation between the structure and fatigue cracks from the viewpoint of Homology.

• Periodical: Materials Science Forum (Volume 893)
• Pages: 181-185
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.893.181
• Online since: March 2017
• Authors: Katsuyuki Kida*, Masayuki Ishida, Koshiro Mizobe, Isamu Yoshida, Ayumu Tamura, Nakane Kazuaki
• Keywords: Crack Growth, Fatigue, Fractography, Homology, Low Carbon Steel (S45C), Stress Intensity Factor

References

[1] K. Nakane, K. Mizobe, E. C. Santos and K. Kida, The Betti number of prior austenite structure of repeated quenching bearing steels (JIS, SUJ2), Applied Mechanics and Materials, Vol. 307, pp.409-414. (2013).

DOI: 10.4028/www.scientific.net/amr.1082.191

[2] K. Nakane, K. Mizobe, E. C. Santos and K. Kida, The Quantization of the structure of fisheyes via homology method, Applied Mechanics and Materials, Vol. 372, pp.273-276. (2013).

DOI: 10.4028/www.scientific.net/amm.307.409

[3] K. Nakane, K. Kida, T. Honda, K. Mizobe and E. C. Santos, Influence of repeated quenching on bearing steel martensitic structure investigated by homology, Applied Mechanics and Materials, Vol. 372, pp.270-272. (2013).

DOI: 10.4028/www.scientific.net/amm.372.270

[4] K. Nakane, K. Kida and K. Mizobe, Homoogy analysis of austenite grain size of SAE52100 bearing steel processed by cyclic heat treatment, Applied Mechanics and Materials, Vol. 813, pp.116-119. (2013).

DOI: 10.4028/www.scientific.net/amr.813.116

[5] K. Nakane, E. C. Santos, T. Honda, K. Mizobe and K. Kida, Homology analysis of structure of high carbon bearing steel: effect of repeated quenching on prior austenite grain size, Materials Research Innovations, Vol. 18 (Supplement 1), pp.33-37. (2014).

DOI: 10.1179/1432891713z.000000000353

[6] K. Nakane, Y. Tsuchihashi and N. Matsuura, A simple mathematical model utilizing topological invariants for automatic detection of tumor areas in digital tissue images, Diagn Pathol. Vol. 8 (Suppl 1), S27. (2013).

DOI: 10.1186/1746-1596-8-s1-s27

[7] K. Kida, K. Mizobe, R. Arai and K. Nakane, The Betti number of prior austenite grain of repeated quenching bearing steels (JIS, SUJ2), Advanced Materials Research, Vol. 1082, pp.191-196. (2015).

DOI: 10.4028/www.scientific.net/amr.1082.191

[8] M. Ishida, K. Kida, K. Mizobe and K. Nakane, The Betti number of fatigue fracture surfaces of low carbon steel (JIS, S45C), Advanced Materials Research, Vol. 1102, pp.59-63. (2015).

DOI: 10.4028/www.scientific.net/amr.1102.59

[9] J. E. Srawley, Wide range stress intensity factor expressions for ASTM E 399 standard fracture toughness specimens, Int. Jour. of Fracture, 12 (1976).

DOI: 10.1007/bf00032844

[10] J. C. Newman, Jr., Stress Analysis of the Compact Specimen Including the Effects of Pin Loading, Fracture Analysis, ASTM STP 560, American Society for Testing and Materials, pp.105-121. (2013).

DOI: 10.1520/stp33136s