Study of Fatigue Fractography of Mild Steel Used in Automotive Industry

Main Article Content

Ahmed Ameed Zainulabdeen

Abstract

Fatigue failure is almost considered as the predominant problem affecting automotive parts under dynamic loading condition. Thus, more understanding of crack behavior during fatigue can strongly help in finding the proper mechanism to avoid the final fracture and extent the service life of components. The main goal of this paper is to study the fracture behavior of low carbon steel which is used mostly in automotive industry. For this purpose, the fractography of samples subjected to high and low stress levels in fatigue test then was evaluated and analyzed. Hardness and tensile tests were carried out to determine the properties of used steel. Also, the samples were characterized by microstructure test and XRD analysis to examine the constitute phases. The fatigue test (S-N curve) was done at stress ratio (R= -1), and the fracture examination was perform using Scanning Electron Microscope (SEM). The results of microstructure and XRD analysis were indicating that the Ferrite and a little amount of pearlite are the dominant phases of this steel. Whereas, the fractography observations reveal that the void coalescence ductile fracture is the main failure mode in samples with high stress level, while the ductile fracture (void coalescence) with Transgranular Cleavage fracture was noticed in low stress fatigue mode for this alloy.

Article Details

How to Cite
ZAINULABDEEN, Ahmed Ameed. Study of Fatigue Fractography of Mild Steel Used in Automotive Industry. Al-Khwarizmi Engineering Journal, [S.l.], v. 15, n. 1, p. 82- 88, mar. 2019. ISSN 2312-0789. Available at: <http://alkej.com/index.php/en/article/view/765>. Date accessed: 23 mar. 2019. doi: https://doi.org/10.22153/kej.2019.07.003.
Section
Articles

References

[1] Nacy, Somer M. "Effect of Heat Treatment on Fatigue Behavior of (A193-51T-B7) Alloy Steel.", Proceedings of the World Congress on Engineering, pp1247-1250, Vol II, 2007, London, U.K.
[2] Shrama, Kadhum. “Fatigue of welded high strength steels for automotive chassis and suspension applications”, PhD. Thesis, School of Engineering, Cardiff University, 2016.
[3] B. Claude, “Fatigue of materials and structures”, John Wiley & Sons, 2013.
[4] J. C. Yeol. "High-Cycle Fatigue Properties of Automobile Cold-Rolled Steel Sheet with Stress Variation", Materials Transactions vol.54, No.10, pp.2037-2043, (2013).
[5] M. W. Dewan, G. González, and M. A. Wahab. "Effects of Rotating-Bending and Torsional Fatigue Loads on Gas Tungsten Arc (GTA) Welded AISI 1018 Low Carbon Steel Joints." ASME 2015 International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2015.
[6] D. Angelova, R. Yordanova, and S. Yankova. "Fatigue crack development in a low-carbon steel. Microstructure influe- ence Modelling." Procedia Structural Integrity Vol.2 pp. 2726-2733, (2016).
[7] ASM Handbook, Volume 1, Properties and Selection: Irons, steels and high performance alloys, ASM International, USA, 1990.
[8] A. A. abid and A. F. Jawad,” Effect of Martensite Volume Fraction On the Microstructure and Mechanical Properties of Low Carbon Dual Phase Steel”, Applied Research Journal, Vol.2, No.6, pp.266-274, June, 2016.
[9] N.W. Sachs, "Understanding the surface features of fatigue fractures: how they describe the failure cause and the failure history." Journal of Failure Analysis and Prevention Vol.5, No.2, pp. 11-15, (2005).
[10] S. K. Akay, M. Yazici, A. Bayram and A. Avinc, "Fatigue life behaviour of the dual-phase low carbon steel sheets", Journal of materials processing technology, Vol. 209, No.7, pp. 3358-3365, (2009).
[11] R.J. Shipley and W.T. Becker, ASM Handbook, Vol.11,” Failure Analysis and Prevention. ASM International, 2002.