ISSN: 2277-9655 [Yadav * et al., 6(10): October, 2017] Impact Factor: 4.116 IC™ Value: 3.00 CODEN: IJESS7 http: // www.ijesrt.com© International Journal of Engineering Sciences & Research Technology [142] IJESRT INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY EXPERIMENTAL STUDY ON THE EFFECT OF HEAT TREATMENT ON THE PROPERTIES OF DUCTILE IRON AFTER ALLOYING Rajneesh Yadav *1 , Dr Lokendra Pal Singh 2 & Romiyo Mclin Jojowar 3 *1 M.Tech Scholar, Dept. of Mechanical Engineering, SHUATS, Allahabad, U.P., India 2 Asst. Professor, Dept. of Mechanical Engineering, SHUATS Allahabad, U.P., India 3 M.Tech Scholar, Dept. of Mechanical Engineering, SHUATS, Allahabad, U.P., India DOI: 10.5281/zenodo.1002677 ABSTRACT Cast Iron, the first man – made composite, is at least 2500 year old. It remains the most important casting material, with over 70 % of the total world tonnage. The man for cast iron longevity are its wide range of mechanical and physical properties coupled with its competitive price. Ductile iron or popularly known as spherodized graphite iron (SGiron) is a special variety of cast iron having carbon content more than 3 % and has graphite present in compact, spherical shapes. These compact spheroid hamper the continuity of the matrix much less than graphite flakes which results in higher strength and toughness with a structure that resembles gray cast iron , thus imparting superior mechanical properties i.e. much higher than all other cast irons and which can be compared to steel .This unique property enables ductile iron to be used for numerous industrial applications .The excellent combination of mechanical properties obtained in S.G. iron can further be improved by the heat treatment . The most recent development in this regard is the production of Austempered Ductile Iron (ADI). It provides an excellent combination of high tensile strength, wear resistance along with good corrosion resistance and quite significant amount of ductility. Due to these factors, S.G. or ductile iron is austempered when a very favouurable combination of various properties is required. But this type of treatment is bit tricky, since it require controlled heating and isothermal holding of the material. So it is necessary to find some attractive methods for property development in S.G. iron.The present work is an attempt to study the properties enhancement of ductile iron by heat treatment. Normalizing, Austenitization, Quenching & Tempering, Austempering methods are applied to study the hardness, tensile strength, and impact strength of the material. The mechanical properties obtain by various technique have been compared to one another using two different grades of S.G. Iron (one with copper and another without copper). The effect of copper has been studied. KEYWORDS: Ductile iron, Tempered iron, Austempered, tensile strength and elongation. I. INTRODUCTION Ductile Iron is also commonly known as “Nodular Iron” or Spheriodial graphite (S.G) iron was patented in 1948. With a steep rise in development work in 1950 within a decade ductile iron was extensively used in Industries as an popular engineering material. Its use in commercial application is still relevant in todayscenario. Graphite is present as flakes in grey iron while it is present as spheroids in the ducile iron which gives it unusual combination of properties. By adding a very small, but specific amount of Mg &Ce or both to molten iron of proper composition this mode of solidification is obtained. Like malleable iron, Ductile Iron exhibits a linear stress-strain ratio; a considerable rang of yield strengths and as its name implies ductility. Awide range of sizeswith sections which are very thin or very thick in the castings are made by ductile iron. By controlling the matrix structure around the graphite as they are cast or by subsequent heat treatmentthe different grades are produced. Controlling of the matrix structure as-cast to provide response to heat treatment is done by alloy addition.