Micro-Crack Analyses of Chromium Steel JIS-SCr 420 for Helical Gear Transmission

Abstract:

This research aims to investigate micro-crack on a failed for helical gear transmission which was to adjust the engine to increased horsepower. The helical gears made are from chromium steel JIS-SCr 420. The spectrophotometer test machine was used to detect chemical composition, Mechanical properties were evaluated by Vickers hardness and microstructural analysis with an optical microscope, which the crack of the surface layer and energy dispersive spectroscopy using a scanning electron microscope. The results showed that the fracture characteristic of the helical gear’s surface was expected to beach marks and break away. It can be seen that the mixing failure area of oxide inclusion with carbide surrounding before the liquid state of material will be solidified which caused the failure cause of this helical gear. The summary analysis results can be accorded with the assumption of this research and which help prolong service life of the component.

• Periodical: Key Engineering Materials (Volume 777)
• Pages: 294-299
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.777.294
• Online since: August 2018
• Authors: Visanu Boonmag*, Ongarj Wisesook, Aphinan Phukaoluan, Ganwarich Pluphrach
• Keywords: Chromium Steel, Fatigue Fracture, Helical Gear, Micro-Crack

References

[1] Elecon Engineering Co., Ltd, Power transmission & Drive Solution, http://www. elecon.com/gearworld/dat-gwfailure.html, (2002) access on Jan (2010).

[2] K.J. Abhay, V. Diwakar, Metallurgical analysis of failed gear, Eng. Fail. Anal., vol. 9 (3), pp.359-365, (2002).

[3] K.L. Johnson, The strength of surfaces in rolling contact, Mech. Eng. Sci., vol. 203 (3), pp.151-163, May (1989).

[4] A.L. Alban, Systematic Analysis of Gear Failures, Second Edition, ASM International, Materials Park, Ohio, pp.86-94, (1985).

[5] P.J.L. Fernandes, Tooth bending fatigue failure in gears, Eng. Fail. Anal. vol. 3 (3), pp.219-225, Sep (1996).

[6] A.L. Alban, Failure of gears, failure analysis and prevention, american society for metals, Materials Park, Ohio, 1996, pp.587-601.

[7] B. Errichello, J. Muller, How to analyze gear failures, http://www.machinerylubri-cation.com/Read/150/gear-fail ures.html, access on Apr (2011).

[8] S. Suresh, R.O. Ritchie, Propagation of short fatigue cracks, International Metals Reviews, vol. 29 (1), pp.445-475, Jul (2013).

DOI: 10.1179/imtr.1984.29.1.445

[9] D.W. Dudley, Fatigue and Life Prediction of Gear, ASM Handbook, Metal Park, American Society for Metals, 1996, p.872.

[10] JIS G 4053, Japanese Industrial Standard, First English Edition. Japan, (2003).

[11] Visanu Boonmag and Ganwarich Pluphrach, Mechanical Properties and Microstructure of Pickup's Helical Gear Transmission Failure Analyses, KASEM BUNDIT ENGINEERING JOURNAL, vol. 5, pp.146-153, Jul (2015).

[12] Osman Asi, Fatigue Failure of a Helical Gear in a Gearbox, Engineering Failure Analysis, vol.13 (7), pp.1116-1125, (2015).

DOI: 10.1016/j.engfailanal.2005.07.020

[13] Samroeng Netpu, Panya Srichandr, Failure Analysis of a Helical Gear in a Power Plant, Engineering Failure Analysis, vol. 32, pp.81-90, Sep (2013).

DOI: 10.1016/j.engfailanal.2013.03.002

[14] William D. Callister, Materials science and engineering an introduction, Seventh edition, John Wiley & Sons Inc, (2007).

[15] Charnont Moolwan and Samroeng Netpu, Failure Analysis of a Two High Gearbox Shaft, Engineering and Energy Conference, 88: pp.154-163, (2012).

DOI: 10.1016/j.sbspro.2013.08.491