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Influence of Hardness Variation and Defects on Fatigue Behavior of Automotive Steels
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 28, 2017 by SAE International in United States
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Fatigue behavior of two types of automotive steel, quenched and tempered SUJ2 and carburized SCM820PRH, which are applied as powertrain parts are studied. These two types of steel are different in their hardness distribution from surface to core. The hardness of quenched and tempered SUJ2 is homogenous, in contrast to that of carburized SCM820PRH (SCM) which decreases from surface to core. These steels are investigated in terms of their monotonic tensile properties and fatigue behavior. A number of predictive methods were used to describe the fatigue behavior of these steels. A simple predictive method is based on approximation of S-N curve from ultimate tensile strength. The well-known Murakami’s defect area method was also applied for the prediction of the high cycle fatigue strength. It was found that the classic estimation of fatigue behavior which considers 700 MPa as fatigue limit at 106 cycles for materials with ultimate strength of more than 1400 MPa is reasonably close to fatigue behavior of SCM steel. However, considering half of ultimate strength as fatigue limit at 106 cycles resulted in a close prediction of fatigue behavior of SUJ2 steel. Also, Murakami’s defect area method resulted in reasonable predictions of fatigue limit for both steels while being closer to experimental data for SUJ2 which has a uniform distribution of hardness.
CitationCha, S., Hong, S., and Sharifimehr, S., "Influence of Hardness Variation and Defects on Fatigue Behavior of Automotive Steels," SAE Technical Paper 2017-01-0345, 2017, https://doi.org/10.4271/2017-01-0345.
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- Cha, Sung Chul, and Erdemir Ali, eds., "Coating Technology for Vehicle Applications," Springer, 2015.
- Cha, Sung Chul, Hong Seung-Hyun, Kim Iksoo, Kim Myung-Yeon, Park Jihye, Suh Jin-Yoo, Shim Jae-Hyeok, and Jung Woo-Sang. "CALPHAD-based alloy design for advanced automotive steels-Part I: Development of bearing steels with enhanced strength and optimized microstructure." Calphad (2016).
- Yin, F., and Fatemi. A. "Fatigue behaviour and life predictions of case-hardened steels." Fatigue & Fracture of Engineering Materials & Structures 32, no. 3, 2009, 197-213.
- Liu, Yan, Wang Maoqiu, Shi Jie, Hui Weijun, Fan Gang, and Dong Han. "Fatigue properties of two case hardening steels after carburization." International Journal of Fatigue 31, no. 2, 2009, 292-299.
- Ma, L., Wang M. Q., Shi J., Hui W. J., and Dong. H. "Influence of niobium microalloying on rotating bending fatigue properties of case carburized steels." Materials Science and Engineering: A 498, no. 1, 2008, 258-265.
- Murakami, Y., Kodama S., and Konuma. S. "Quantitative evaluation of effects of non-metallic inclusions on fatigue strength of high strength steels. I: Basic fatigue mechanism and evaluation of correlation between the fatigue fracture stress and the size and location of non-metallic inclusions." International Journal of Fatigue 11, no. 5, 1989, 291-298.
- Murakami, Y., and Usuki. H. "Quantitative evaluation of effects of non-metallic inclusions on fatigue strength of high strength steels. II: Fatigue limit evaluation based on statistics for extreme values of inclusion size." International Journal of Fatigue 11, no. 5, 1989, 299-307.
- Murakami, Yukitaka. Metal fatigue: effects of small defects and nonmetallic inclusions. Elsevier, 2002.