OCTOBER 19-20, 2012 - YMCA University of Science & Technology

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Proceedings of the National Conference on Trends and Advances in Mechanical Engineering, YMCA University of Science & Technology, Faridabad, Haryana, Oct 19-20, 2012 3. The mechanical properties (Hardness, UTS) of the Al-2Fe-V-Si alloys are improved after modification with Ni-20Mg master alloy without affected ductility. Reference [1] Das.S.K., Gillman.P.S., Raybould.D., 1989 “Application of Rapidly solidified High Temperature Al – Alloys”, Key Engineering Materials, 367, 437-448. [2] Edward J.and Kubel Jr., 1986 “Aluminum alloys: A Push for Excellence”, Advanced Materials and Processes inc. Metal Progress, 12, 43-49. [3] Jones, H., Roy, 1988, In materials in aerospace (London. The Royal Aeronautical Society) 1 97-121, 1986. [4] Skinner, D.J., Kim,Y.M., and Griffith, W.M., 1988, The Physical Metallurgy of Dispersion strengthened Al Alloys”, The Minerals Metals and Materials society, 188-197. [5] Sanders, R. E., Baumann, Jr. S.F., and Stumpf, H. C., 1989 “Wrought Non Heat Treated Al- Alloys”, Treatise on Materials Sc. and Tech; 31, 83-85. [6] Lavernia,E.J, Ayers,J.D, Srivatsan,T.S., 1992, International Materials Review, 37, 1. [7] Mondolfo, L.M., 1976, “Aluminum Alloys- Structure and Properties”, Butterworths, London, 282-287. [8] Metal Handbook, 1990, 10 th Edition, ASM international, The materials information society, 2. [9] Apelian. D., Sigworth. G.K. and Whaler. K.R., 1984, “Assessment of Grain Refinement and Modification of Al-Si Boundary Alloy by Thermal Analysis,” AFS Trans, 92, 297-307. [10] Srivastava, A.K., Ojha, S.N., and Ranganathan, S., 1998, “Microstructural Features and Heat Flow Analysis of Automized and Spray-Formed Al-Fe-V-Si Alloys”, Metallurgical and Materials Transactions A, 29 A, 2205-2219. [11] Sahoo, K.L., Sivaramakrishnan, C.S.,& Chakrabarti, A.K., 2001, “The Effect of Mg Treatment on the Properties of Al-8.3Fe-0.8V-0.9Si Alloy”, Journal of Mater. Processing Tech.,112, 6-11. [12] L. M. Mondolfo, Aluminnium alloys- Structure and Properties, Butterworths, London, 1976. 602
Proceedings of the National Conference on Trends and Advances in Mechanical Engineering, YMCA University of Science & Technology, Faridabad, Haryana, Oct 19-20, 2012 IMPACT OF SHOT PEENING AND HOT TREATMENT PROCESS ON SURFACE HARDENING OF WELDED 304L AUSTENITIC STAINLESS STEEL Lakhwinder Singh 1 , R.A. Khan 2 , M.L. Aggarwal 3 1. Associate Professor, Deptt. of Mechanical Engineering , YMCA University of Science & Technology, Faridabad-121006, INDIA 2. Professor, Deptt. of Mechanical Engineering, School of Engineering & Technology, Galgotias University, Greater Noida, INDIA 3. Professor, Deptt. of Mechanical Engineering , YMCA University of Science & Technology, Faridabad- 121006, INDIA Abstract Heat treatment process like case carburizing & nitriding and cold working process like shot peening are the most widely used processes for surface hardening of welded components used in structures, automobiles, heavy duty machines, etc. In case carburizing and nitriding of steel components the composition of the surface changes by the diffusion of carbon and nitrogen respectively and results in a hard outer surface with good wear resistance properties. Similarly shot peening improves the surface characteristics by deforming the surface layer by the shots. In the present paper a controlled nitriding, case carburizing and shot peening processes are discussed for welded 304L austenitic stainless steel. There impact is determined on the surface hardness and corrosion resistance of the welded joint. Vickers’ hardness and salt spray test were carried out for the abovementioned welded stainless steels before and after diffusion hardening. Keywords: Shot Peening, Nitriding, Case carburizing, Austenitic stainless steel. 1. Introduction Austenitic stainless steels are iron-chromium-nickel alloys having a face-centered cubic (FCC) crystal structure. It is non magnetic in nature. It is seen experimentally that solid case carburizing adversely effects on surface hardness and tensile strength of austenitic stainless steel [1]. There are limited surface hardening treatments which are applicable to the stainless steels. The strength of austenitic stainless steels can be increased by solid solution hardening with nitrogen, fine grain hardening and by cold work [2]. It is possible to surface harden the austenitic stainless steels by nitriding. In nitriding as of other steels the surface layer is hard and thin. Carburizing is an example of chemical – thermal process, it adds carbon to the surface layer, together with appropriate heat treatment. It is a surface hardening process widely used in number of industrial applications. In most instances hardening of carbon and low alloy steels is due to the martensitic transformation, in which the achievable hardness is related to the carbon content - as most austenitic stainless steels have carbon contents ranging from fairly low to extremely low. Turpin et al. [3] did gas carburizing at atmospheric pressure. They observed that the growth of chromium-rich carbides during carbon transfer into the steel was responsible for an important depletion of the metallic chromium content in the austenitic solid solution all around the carbides. At the end of the carburizing process, the corrosion resistance of the steel strongly depended on the carbon content at the surface. To obtain the best compromise between hardness level and corrosion resistance in the carburized layer, the carbon profile in the steel must be controlled carefully. Cold working is used to increase strength, especially in higher alloyed austenitic stainless steels [4]. The improvement in mechanical properties such as surface hardness, fatigue strength, tensile strength, damping etc. are due to the induction of compressive residual stress in the metal parts [5]. The residual compressive stress induced by shot peening is the function of material and mechanical conditions. Shot peening process is impacting a surface with shot (round metallic cast steel, glass, ceramic particles) with force sufficient to create plastic deformation. It operates by the mechanism of plasticity, each particle functions as a ball-peen hammer. The magnitude of the compressive stress induced and the depth of the induced layer depend considerably on the peening intensity [6, 7]. Peening intensity can be defined as a measure of the kinetic energy within a stream of peening media. Peening intensity attained can vary with shot size, shot hardness, shot speed, shot flow rate, impact angle, coverage, etc. 603
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NATIONAL CONFERENCE ON TRENDS AND A
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MESSAGE I am pleased to learn that
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Proceedings of National Conference
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Akash Equipments & Machineries (P)
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3. MATHEMATICAL FORMULATION Proceed
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OUTPUT Proceedings of the National
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6.2 Effect of input factors on Surf
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3 Al-Al Compound Casting using high
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References Proceedings of the Natio
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‣ Maximize the degree of efficien
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OCTOBER 19-20, 2012 - YMCA University of Science & Technology

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