Materials Science and Metallurgy Engineering

ISSN (Print): 2373-3470

ISSN (Online): 2373-3489

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Website: http://www.sciepub.com/journal/MSME

   

Article

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: dav76@ukr.net

Abstract

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.

Keywords

References

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[4]  Dubodelov, V., Fikssen, V., Slazhniev, M., Goryuk, M., Skorobagatko, Yu., Berezina, A., Monastyrska, T., Davydenko, O., Spuskanyuk, V. “Improving of Al-Si alloys by their combined MHD and thermo-forced processing in liquid and solid states,” Magnetohydrodynamics, 48 (2), 379-386, 2012.
 
[5]  Berezina, A., Monastyrska, T., Dubodelov, V., Segida, O., Fikssen, V. “Effects of Melt Treatment in the Magnetodynamic Installation on the Structure of Al-Si Alloys,” Aluminum Alloys, ICAAII, DGM, v.1, pp. 470-476, 2008.
 
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[6]  Beloshenko, V., Spuskanyuk, V. “ECAE Methods of Structure Modification of Materials,” International Journal of Materials and Chemistry, 2(4), 145-150, 2012.
 
[7]  Berezina, A.L., Dubodelov, V.I., Monastyrska, T.O., Fikssen, V.N., Slaznev, M.A., Skorobagat'ko, Yu.P. “Impact of Magnetohydrodynamic Treatment of Cuprous Hypereutectic Silumins on Processes of Formation of Strengthening Nanoparticles During the Ageing,” Metallofizika i Noveishie Tekhnologii, 33 (5), 651-66, 2011.
 
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Article

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: chandrashekhar_dev@yahoo.co.in

Abstract

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.

Keywords

References

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Article

Microstructural and Thermomechanical Characterization of the Bassar Remelted Steel

1Department of physics, University of Lomé, Lomé, Togo

2GMS-LPCS UMR7045 / Chimie Paristech Paris Cedex 05, France

3Palais de la découverte / Universcience, Avenue Franklin Roosevelt, 75008 Paris, France


Materials Science and Metallurgy Engineering. 2016, 3(1), 8-11
doi: 10.12691/msme-3-1-2
Copyright © 2016 Science and Education Publishing

Cite this paper:
Pali KPELOU, Gnande DJETELI, Tiburce Ahouangbe ABOKI, Ayi Djifa HOUNSI, Kossi NAPO. Microstructural and Thermomechanical Characterization of the Bassar Remelted Steel. Materials Science and Metallurgy Engineering. 2016; 3(1):8-11. doi: 10.12691/msme-3-1-2.

Correspondence to: Pali  KPELOU, Department of physics, University of Lomé, Lomé, Togo. Email: palikpelou@gmail.com

Abstract

This article presents the microstructural and thermomechanical study of the Bassar remetlted steel obtained from melting Bassar as-smelted steel. Bassar as-smelted Steel is steel made by direct reduction of Bandjeli iron ore in a natural draught furnace. Bandjeli village is located in the Bassar Region in the Republic of Togo (West Africa). The Bassar remelted steel was obtained by melting at 1370°C of Bassar as-smelted Steel in a high frequency furnace to eliminate inclusions and pores contained in the Bassar as-smelted Steel. The microstructural and mechanical analyses show that the Bassar remelted steel is homogeneous and contains no defects compared to as-smelted steel. The microstructure of the remelted Steel is formed of ferritic grain whose average size is more than 0.5 mm. Some precipitates are observed in grain and grain boundaries. Heat treatment shows that the average grain size increases as the annealing temperature increases. For the sample annealed at 600°C for one hour, its tensile strength is 338 MPa and the strain rate is 20%. The mechanical properties of the Bassar remelted steel decrease after annealed at 800°C and 950°C for one hour.

Keywords

References

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