Qualification: 
M.Tech
r_saravanan@cb.amrita.edu

Saravanan R. currently serves as Assistant Professor at Department of Mechanical Engineering, School of Engineering, Coimbatore Campus. His areas of research include Material Science and Manufacturing Engineering and Lean Manufacturing.

Publications

Publication Type: Journal Article

Year of Publication Title

2019

Saravanan R., “Microstructure, Hardness and Corrosion Resistance of Surface Modified Ni - Hard 4 Cast Iron with Nitrogen Using Gas Tungsten Arc”, International Journal of Recent Technology and Engineering (IJRTE), 2019.[Abstract]


The change in microstructure, hardness and corrosion rate of Ni-Hard 4 cast iron were studied after surface modification with Nitrogen mixed the Argon shielding environment. The microstructure of the modified layer was grains with the presence of nitrogen, observed under the optical microscope. An average of 1.37wt% of Nitrogen was observed in the modified layer during EDAX analysis. The presence of Nitrogen in the modified layer has formed FeN, Ni3N and Cr2N phases. The formation of nitride phases were confirmed during XRD spectral analysis. The hardness of the modified layer was taken along the depth direction. The hardness of the modified layer was improved from 578HV of the substrate to 1735HV of the modified layer. The electrochemical polarization test was conducted at a 3.5wt. % saline (NaCl) solution in both the substrate and the modified layer. The modified layer forms a protective layer over the surface and reduced the corrosion rate than the substrate More »»

2019

Saravanan R., Dominic, M., and , “Evaluation of Weld Joint: Cupro – Nickel with Aluminium 5083”, International Journal of Recent Technology and Engineering (IJRTE), vol. 8, no. 3, 2019.[Abstract]


Cupro-Nickel and Aluminium alloy to their series, Al 5083 and 70Cu30Ni are the critical alloys in ship building mainly in piping section. Due to the reason of having a huge difference in their physical and chemical properties, obtaining a good bonding between them by welding is rather a tough job. The welding was conducted by giving waviness to the torch and allowing the molten pool of Cu-Ni to flow towards the Al 5083 and thereby joining them without melting the aluminium. The microstructure was studied by welding plain plates as well as Nickel coated plates. The microstructural study showed that there is a good bonding between the two alloys. The SEM imaging confirms the bonding of the two alloys at the welded region. The elemental composition of the weld joint was found by EDS analysis. The formation of intermetallics was confirmed by XRD analysis. Then the hardness at the weld joint was studied. The hardness value obtained from testing was promising and there with showing a good properties at the welded joint. The Ni coated welded alloys showed significant and improved results when comparing with the non-nickel plated metal plates. With the hardness value varying from the non Ni coated plates was found to be high compared to the hardness value of the Al and Cu-Ni alloy. But the further study showed that that hardness value adds much to the weld stability by the formation of good bonds between the alloys and that of the intermetallics formed. The impact tests conducted on the welded specimen shows good results with regards to the comparison with the impact strength of 70Cu30Ni and the energy absorbed by the welded specimen. The results showed that welding is possible between these alloys and the nickel coated alloys shows better results in strength and bonding than non- nickel coated alloys. This study also confirms that GTAW can be very effective in joining these dissimilar alloys. More »»

2019

Saravanan R., Nair, S., and Krishnakumar, M., “Impact of tungsten on the surface of aluminium-silicon alloy on microstructure, hardness and wear rate using GTA”, IOP Conference Series: Materials Science and Engineering, vol. 577, p. 012124, 2019.[Abstract]


A study was carried out to determine the effect of tungsten addition on hardness, microstructure and wear behaviour of surface modified as-cast Al - Si alloy. The heat source utilized for modifying the surface of the substrate was Gas Tungsten Arc. Tungsten were deposited on the Al - Si alloy substrate using poly vinyl alcohol as binder and the SMP were performed. By using Lyzer Instruments optical microscope and HITACHI SU6600 FE-SEM microstructural analysis was carried out. The hardness and wear rate of the modified layer were calculated by using a micro-hardness tester and a pin-on-disc wear tester machine. The presence of elemental composition in the modified layer was determined by using Energy Dispersive Atomic X-ray Spectroscopy and its confirmation through XRD analysis. It was inferred from this study that a fine grain microstructure was observed in the modified layer. The hardness and wear resistance was found to increase as a result of W addition and also due to the formation of dispersion strengthening mechanism. The coefficient of friction was found to be independent of the hardness. More »»

2019

K. S. Raghul Anandh, Thilipkumar, K., and Saravanan R., “Surface modification of Ni-hard 4 cast iron with titanium using GTA heat source”, IOP Conference Series: Materials Science and Engineering, vol. 577, p. 012129, 2019.[Abstract]


Ni hard 4 cast iron has high strength and wear resistance material used in pipe fittings, concrete mixture, etc. In this study, improve the surface property like hardness, wear resistance of Ni hard 4 cast iron and adding alloying element like Titanium grade 2 (0.6mm) sheet on the surface using Gas Tungsten Arc as heat source. The hardness was taken at the base and modified area and it is increased from 597.5 HV to 1435 HV. Wear rate was found to be 4.7 for base and 0.15 for modified layer. The wear resistance is improved because of the formation of titanium carbide hard phase in the modified layer. The titanium carbide phase is formed and it was observed by XRD analysis. In the elemental composition analysis the presence of titanium 10 wt% was observed in the modified area. © 2018 Elsevier Ltd. All rights reserved. Selection and/or Peer-review under responsibility of International Conference on Advances in Materials and Manufacturing Applications [IConAMMA 2018]. More »»

2019

R. Vankayala, Saravanan R., and Lakshmikanthan C., “Reduction of Noise in The Vehicle Cabin by Using Natural Fibres with Polyurethane and Comparison with Other acoustic Materials”, IOP Conference Series: Materials Science and Engineering, vol. 577, p. 012013, 2019.[Abstract]


As natural fibres are noise-absorbing materials, biodegradable and renewable by using natural fibres such as betel nut, sugarcane fibres are combing with polyurethane for the automobile application to reduce cabinet noise of the vehicle, which currently contains traditional materials such as foams, glass, metals and plastics that are difficult to recycle. Four samples of natural fibres were prepared with different quantities of betel nut & sugarcane ratios of 35: 35, 50: 20, 55: 15, 60: 10. Polyurethane is common with 30% of all samples. The sound absorption coefficient (SAC) in the material was tested by using impedance tube and compared with other acoustic material like nitrile rubber, nonwoven polyester fabric and glass wool. It was observed that betel nut & sugarcane showing better SAC than other acoustic materials mainly at lower and higher frequency 60% betel, 10% sugarcane & 30% polyurethane showing better sound absorption level.

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2019

M. Krishnakumar and Saravanan R., “Impact of tungsten on microstructure, hardness and wear rate of AISI 304 stainless steel surface alloyed under nitrogen environment”, Materials Research Express, vol. 6, 2019.[Abstract]


An examination was carried out on AISI304 Stainless steel with tungsten by surface modification using Gas Tungsten Arc as a heat source at a constant flow of nitrogen gas added to Argon shielding atmosphere. The microstructure of the W - modified area were observed using a metallurgical microscope. The composition of the surface modified layers were analyzed using EDS. The result of the EDS analysis confirmed the presence of W and N2 content in the modified layers. Further, the presence of intermetallic phases were found during the XRD analysis. Hardness measurements were carried out along the depth direction. The hardness increased by 2010HV on the W- modified layer under N2 atmosphere compared to the 277HV of the substrate. It is noticed that the wear resistance in the surface modified area improved to 0.8 × 10-4 mm3 / N-m from 10.94 × 10-4 mm3 / N-m of the substrate. The reduction in grain size, formation of intermetallic phases, and dispersion of W - particle in the modified layers has improved the hardness and the wear resistance. © 2019 IOP Publishing Ltd.

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2019

M. Krishnakumar, Mohnbabu, A., and Saravanan R., “Impact of Surface Alloying of Nickel on Microstructure, Hardness and Wear on Aluminium–12%Silicon Alloy”, Transactions of the Indian Institute of Metals, 2019.[Abstract]


An investigation was carried out to determine the effect of nickel on the microstructure, hardness and wear behaviour of surface alloying on aluminium–12%silicon alloy. The heat source utilized for modifying the surface was gas tungsten arc. Two hundred-micrometre-thick Ni–P coating was pre-deposited using electroless process on the aluminium–12%silicon alloy substrate. The surface alloying process was performed on the coated surface. By using microhardness tester and pin-on-disc wear testing machine, the hardness and wear rate of the modified layer were calculated, respectively. A refined grain structure was observed with the fusion of Ni in the alloyed layer. That was attributed to the rate of cooling in the modified layer. As a result of nickel addition, the hardness was improved and wear rate was found to decrease. © 2019, The Indian Institute of Metals - IIM.

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2018

Saravanan R., Nair, S., and .Sellamuthu, R., “Effect of Nickel content on hardness and wear rate of surface modified cast aluminum bronze alloy”, Materials Today: Proceedings, vol. 5, no. 2, pp. Pages 6617-6625, 2018.[Abstract]


An investigation was carried out to study the variation of nickel content on the microstructure, the hardness and the wear rate of surface modified cast aluminium bronze alloy. The heat source used was gas tungsten arc for modification of the surface. The nickel was coated by using electroplating technique on the cast aluminium bronze alloy by varying the coating thickness. The hardness increases and the wear rate decreases for the surface modified specimen. EDAX results confirms the presence of AlNi3 and AlNi intermetallic compounds. The result obtained by this investigation are compared with the earlier literature. More »»

2014

Saravanan R. and R. Sellamuthu, “Determination of the Effect of Si Content on Microstructure, Hardness and Wear Rate of Surface-refined Al-Si Alloys”, Procedia Engineering, vol. 97, pp. 1348 - 1354, 2014.[Abstract]


Surface refining of Al–Si alloy was carried out using the ‘Gas Tungsten Arc’ (GTA) heat source and the effect of Si content on the microstructure, hardness and wear properties of the surface modified alloys was evaluated. In order to further improve its wear resistance, the Surface Refining Process (SRP) was employed in this study. In the SRP, the surface of the parent material is melted by a suitable heat source and the molten zone is allowed to solidify progressively. It can be noted from the literature that e-beam and laser are the only heat sources employed. Both these sources are highly expensive and their productivity is also low. The depth of the modified layer by e-beam or laser process is found to be inadequate for wear applications. In order to overcome the above shortcomings, in this study, the surface refining of Al–Si alloy was carried out by using an inexpensive, high productivity and commonly available GTA source. In this work, the effect of Si content on the properties is evaluated by varying the Si content from 4-16 wt%. The alloys were sand–cast in the form of bar(150x30x30mm). The Surface melting was carried out with the following GTA parameters: current-150 A, travel Speed-2mm/s, arc length-3mm, tip angle-1800 and electrode diameter-2.4mm. The hardness was measured at different locations by using Vickers Hardness Tester by applying 100 gm load for 15 s and an average value was taken. The wear testing was conducted as per ASTM G99 standard under a dry sliding condition in air using Pin–on–Disc wear tester. In this study, it was noted that the typical as–cast microstructure of the Al–Si alloy illustrating the elongated morphology of the eutectic–Si has been completely refined, and the eutectic–Si is finely dispersed within the α–Al matrix. It is inferred that the microstructure was refined due to fast cooling to have a globular eutectic–Si dispersed within a fine–grained matrix in the GTA process. It was found that the depth of the modified layer is significantly higher than that obtained in the e-beam/laser process. The hardness of the modified layer was found to increase when the Si content is increased from 4-16 wt%. The wear rate is found to decrease with an increase in the Si content whereas the coefficient of friction tends to remain the same. The wear mechanism was found to be adhesive. Finally, the peak hardness of the modified layer increased significantly upon ageing. The observations are in agreement with that of previous studies.

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Publication Type: Conference Paper

Year of Publication Title

2018

C. M. Mithun, R. Sellamuthu, and Saravanan R., “Effect of surface modification on microstructure, hardness and wear rate of steels with 0.2%, 0.4% and 1.1 Wt%C by the addition of Titanium using Gas Tungsten Arc”, in Materials Today: Proceedings, 2018, vol. 5, pp. 7586-7594.[Abstract]


Hardness in steels typically increases at the expense of toughness. Surface modification is an alternative method suggested by researchers to achieve wear resistance while maintaining a tough core. In this study, the surface of three steel specimens - one each of 0.2%C, 0.4%C and 1.1 Wt% C were surface modified with commercially pure Titanium, and the corresponding microstructures, hardness and wear rates were studied. Gas tungsten arc heat source was used for the surface modification. The microstructures were observed and the wear rates compared for unmodified and modified specimens. The modification resulted in increased hardness and decreased wear rates. © 2017 Elsevier Ltd.

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2018

K. M. Kumar, Saravanan R., R. Sellamuthu, and Narayanan, V., “Microstructure, hardness and wear rate of heat treated Titanium surface alloyed AISI 304 stainless steel”, in Materials Today: Proceedings, 2018, vol. 5, pp. 7571-7576.[Abstract]


AISI 304 stainless steel bar and commercially pure titanium were chosen as the substrate and the alloying material, respectively. The surface alloying process was done using heat generated by the gas tungsten arc source. The surface alloying AISI 304 stainless steel specimens were heat treated in the furnace for 6 h. The intermetallic compound precipitates were observed in the surface alloyed layer. The elemental analysis were observed using the EDS analysis. There was an increase in hardness and decrease in the wear rate on the surface alloyed layer after the heat treatment process. © 2017 Elsevier Ltd.

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2014

Saravanan R. and R., S., “An Investigation of the Effect of Surface Refining on the Hardness and the Wear Properties of Al-Si Alloy”, in Dynamics of Machines and Mechanisms, Industrial Research, 2014, vol. 592-594, pp. 53-57.[Abstract]


Surface refining of Al–Si alloy was carried out using the GTA heat source. It was observed that the microstructure contains a globular shaped eutectic – Si distribution within the α–Al matrix. The hardness is found to increase and the wear is found to decrease upon surface refining. The precipitation hardening treatment was effective in increasing the hardness of the modified layer. The GTA heat source has been successfully applied to the surface refining of the Al–Si alloy. The result of this study is comparable to those of previous studies.

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