Materials Science and Metallurgy Engineering

ISSN (Print): 2373-3470

ISSN (Online): 2373-3489

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The Effect of Holding Time on the Hardness of Case Hardened Mild Steel

1Department of Mechanical Engineering, University of Uyo, PMB 1017 Uyo, Akwaibom State-Nigeria

Materials Science and Metallurgy Engineering. 2014, 2(3), 31-34
doi: 10.12691/msme-2-3-1
Copyright © 2014 Science and Education Publishing

Cite this paper:
Ihom P. Aondona, Aniekan Offiong. The Effect of Holding Time on the Hardness of Case Hardened Mild Steel. Materials Science and Metallurgy Engineering. 2014; 2(3):31-34. doi: 10.12691/msme-2-3-1.

Correspondence to: Ihom  P. Aondona, Department of Mechanical Engineering, University of Uyo, PMB 1017 Uyo, Akwaibom State-Nigeria. Email:


The study “the effect of holding time on the hardness of mild steel case hardened with carburizing material energized by cow-bone” has been x-rayed. The mild steel specimens used for the study were carburized in the furnace at 900C at various holding times of 2 hrs, 4 hrs, 6 hrs, and 8 hrs, using 65% charcoal / 35% cow-bone as carburizing material. Hardness values were obtained using Vickers Micro-hardness Tester Machine, from the hardness values, hardness profiles were plotted. The result of the study clearly showed that the hardness of the carburized steel increased with increase in holding time. The hardness profile results were higher for higher holding time (surface hardness: 830 Hv for 2 hrs, 850 Hv for 4 hrs, 900 Hv for 6 hrs and 1000 Hv for 8 hrs) and also the plot of the profile for 8 hrs holding time was higher than that of 6 hrs, and that of 6 hrs was higher than that of 4 hrs, and in that order. This clearly showed that holding time has effect on the hardness of case hardened steel.



[1]  Ihom, A.P. Case Hardening of Mild Steeling using Cow-bones, B.ENG Degree Project Submitted to the Department of Materials and Metallurgical Engineering, University of Jos, 1991, 1-35.
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[3]  Aramide, F.O., Simeon A. I., Isiaka O.O. and Joseph O. B. Pack Carburization of Mild Steel, using Pulverized Bone as Carburize Optimizing Process Parameters, Leonardo Electronic Journal of Practices and Technologies ISSN 1583-1078 16, 2010, 1-12.
[4]   Ihom, A.P., Yaro, S.A., Aigbodion, V.S. The Effect of Carburization on the Corrosion Resistance of Mild Steel in Four Different Media, Journal of Corrosion Science and Technology, 3, 2005, 18-21.
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[6]  Ihom, A.P., Nyior, G.B., and Ambayin, M. Surface Hardness Improvement of Mild Carbon Steel using Arecaceae Waste Flower Droppings, the Pacific Journal of Science and Technology 13, 1, 2012, 133-138.
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Structural Modification of Hypereutectic Al-16.5mass%Si Alloy by Thermo-Mechanical Treatment with ECAP

1Department of Technological Studies of Hydroextrusion Processes, Donetsk O.O.Galkin Institute for Physics and Engineering, National Academy of Sciences of Ukraine, Donetsk, Ukraine

2Department of Constitution and Properties of Solid Solutions, G.V.Kurdyumov Institute for Metal Physics, National Academy of Sciences of Ukraine, Kyiv, Ukraine

3Department of magnetohydrodynamics, Physico-Technological Institute of Metals and Alloys, National Academy of Sciences of Ukraine, Kyiv, Ukraine

Materials Science and Metallurgy Engineering. 2014, 2(3), 35-40
doi: 10.12691/msme-2-3-2
Copyright © 2014 Science and Education Publishing

Cite this paper:
Victor Spuskanyuk, Alla Berezina, Victor Dubodelov, Oleksandr Davydenko, Vladyslav Fikssen, Kristina Sliva, Tetyana Monastyrska. Structural Modification of Hypereutectic Al-16.5mass%Si Alloy by Thermo-Mechanical Treatment with ECAP. Materials Science and Metallurgy Engineering. 2014; 2(3):35-40. doi: 10.12691/msme-2-3-2.

Correspondence to: Oleksandr  Davydenko, Department of Technological Studies of Hydroextrusion Processes, Donetsk O.O.Galkin Institute for Physics and Engineering, National Academy of Sciences of Ukraine, Donetsk, Ukraine. Email:


Evolution of the microstructure and mechanical properties of the hypereutectic Al-16.5mass%Si-3.77mass%Cu alloy by treatment in the liquid state by magnetohydrodynamic (MHD) and hydrodynamic (HD) methods, followed by processing in the solid state by equal channel angular pressing (ECAP) method and thermal treatment has been investigated. This alloy has in initial state a very low value of plasticity at room temperature. Optical microscopy technique was employed in order to determine the evolution of the microstructure after different operating conditions of ECAP and thermal treatments. It was demonstrated that it is possible to significantly improve mechanical properties of this alloy by means of combining a low number of ECAP passes after an adequate combination of MHD+HD processing and thermal treatments.



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Influence of Substrate of the Carbon Contents and Coating Thickness on Scratch and Wear Resistance of AlCrN Films

1Department of Mechanical Engineering, Hirasugar Institute of Technology Nidasoshi, Belagavi-591236, Karnataka, India

2Department of Mechanical Engineering, Nitte Meenakshi Institute of Technology, Bengaluru - 580006, Karnataka, India

3Department of Mechanical & aerospace Engineering, New York University Polytechnic School of Engineering, Brooklyn, USA

4Cutting LAB, Oerlikon Balzers Coating India Limited, Bhosari, Pune-411026, Maharashtra, India

Materials Science and Metallurgy Engineering. 2016, 3(1), 1-7
doi: 10.12691/msme-3-1-1
Copyright © 2016 Science and Education Publishing

Cite this paper:
Chandrashekhar Ambiger, V. R. Kabadi, N. Gupta, K. G. Ambli, Rajesh Bhide. Influence of Substrate of the Carbon Contents and Coating Thickness on Scratch and Wear Resistance of AlCrN Films. Materials Science and Metallurgy Engineering. 2016; 3(1):1-7. doi: 10.12691/msme-3-1-1.

Correspondence to: Chandrashekhar  Ambiger, Department of Mechanical Engineering, Hirasugar Institute of Technology Nidasoshi, Belagavi-591236, Karnataka, India. Email:


Influence of carbon content substrates and different coating thickness Aluminium Chromium Nitride (AlCrN) coatings was investigated and reported in the studies. Low carbon steel (EN353) and high carbon steel (EN31) rectangular blocks were used as substrates. AlCrN coatings with two different thickness was deposited on these substrates using Balzers rapid coating system machine. The morphology, crystal structure, mechanical and tribological properties (surface hardness, wear resistance and coefficient of friction (COF)) of the coatings were examined using SEM, Optical Microscope, AFM analysis, Micro-Hardness tests, Scratch Tester TR-101 and Pin on Disc testing tribometer at atmospheric conditions. It was shown that surface morphology of D C Arc deposited AlCrN coatings is affected by the substrates properties (carbon content). The increase in the carbon contents of the substrates resulted in the increase of adhesion force between the substrates and coatings. It was also found that, AlCrN/EN31 steel with smooth roughness has the higher wear resistance than AlCrN/EN353 steel substrate.



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