Characterization of Local Bolt (C= 0.071%) after Surface Hardened at a Temperature of 400 °C for 7 Hours with RF Plasma Nitrocarburizing Apparatus

Abstract:

Surface hardening on local bolt (C = 0.071%) with Radio Frequency (RF) - plasma nitrocarburizing apparatus has been carried out. Some local bolt component was cleaned with distilled water. The type of material of local bolt component was low carbon steel, carbon concentration 0.071%. After that the local bolt component was cleaned with acetone. The natural oxide layer on the surface of the local bolt material was etched with HF for 1 until 3 minutes. The local bolt component was cleaned again with distillation water. Then the local bolt component was sprayed with nitrogen gas. After that the local bolt component was hardened on the material surface with RF plasma nitrocarburizing at a temperature of 400 °C, for holding time 7 hours. Sample number 1 was sample before nitrocarburization. Sample number 2 was sample after nitrocarburization at a temperature of 400 °C, for 7 hours. Then the local bolt component was cut with mower as samples for microstructure observed. The samples were mounted, polished, and etched for microstructure observation with optical microscope. The surface hardness of the samples was tested with O.M.A.G micro-hardness Vickers, MHX 10, apparatus. The expenses tracking was 300 grf, and the times tracking was 15 seconds. The results show that the hardness of sample of bolt before nitrocarburization was 154.5 Kgf/mm², after the sample was nitrocarburized at a temperature of 400 °C for 7 hours, the maximum hardness on the surface increased up to 205.6 Kgf/mm². Matrixes on the base material were austenite, ferrite, and perlite.

• Periodical: Applied Mechanics and Materials (Volume 575)
• Pages: 446-451
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.575.446
• Online since: June 2014
• Authors: Usman Sudjadi*
• Keywords: Hardness, Local Bolt, Microstructure, Nitrocarburizing, RF Plasma

References

[1] J. Gonyeau, www. nucleartourist. com/images/tb-brg-gift (2005).

[2] G. Leonard Devila, et al., Physics Scripta, T131 014011(4pp) (2008).

[3] V.A. Dutka, Journal of Super-Hard Materials, 1063-4576, Vol. 30, Number 5 (2008).

[4] Makishi et al., Engineering and Mining Journal (2009).

[5] S. Gredelj, et al., Thin Solid Films, Science Direct, online at www. sciencedirect. com (2006).

[6] R. Valencia et al., Brazilian Journal of Physics, vol. 34, no. 4B (2004).

[7] U. Sudjadi, Research Report, Financed by Indonesia Minister of Research and Tech. Office (2012).

[8] U. Sudjadi, Study About Surface Hardening on Local Disc Brakes with Direct Current Plasma Nitrocarburizing Apparatus, International Journal of Advances in Materials, Processing and Manufacturing, Trans Tech Publications Ltd, Switzerland, Vol. 789, pp.383-386, (2013).

DOI: 10.4028/www.scientific.net/amr.789.383

[9] U. Sudjadi, 13th International Conf. of Quality in Research, June 25-28, Indonesia (2013).

[10] U. Sudjadi, 1st International Conf. on The Science and Engineering of Materials (ICoSEM), Kuala Lumpur, Malaysia, 13-14th November (2013).

[11] Nurlaelah and U. Sudjadi, International Journal Applied Mechanics and Material, Vol. 507, pages 97-106, January (2014).

[12] U. Sudjadi, Indonesia Patent No. P. 00201300400, (2013).