Author: Michael WickinsPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Guaranteeing Microstructure and Mechanical Properties of Austempered Ductile Irons (ADI) Using Non Destructive Evaluation Techniques
A Comparative Evaluation of Mechanical Properties and Machinability of Austempered Ductile Iron (ADI) and Microalloyed Steel
Author: Debanshu BhattacharyaPublisher:
ISBN:
Category : Iron, Nodular
Languages : en
Pages : 6
Book Description
Effect of Heat Treatment Procedures on Microstructure and Mechanical Properties of Nodular Iron
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
In their bid to produce cast iron latter than Malleable Iron, the scientist discovered the ductile iron or S.G. Iron (spherodial Graphite iron) way back in 1948. The use of this type of cast iron as an engineering material has been increasing day by day ever since its discovery. It is now replacing steel in many important engineering applications. The production of S.G Iron increased to a large extent during last two decades. The excellent combination of mechanical properties obtained in S.G. iron can further be informed 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 are austempered when a very favourable 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. In the present work conventional heat treatment proceeds like annealing, normalizing and tempering of the material has been performed. The mechanical properties obtain by various technique have been compared to one another. In this work two different grades of S.G. Iron (one with copper and another without copper) have been used. The effect of the alloying element (i.e. copper) has also been studied.
Austempered Ductile Iron: Processing and Mechanical Properties
Author: Ranjit Kumar PandaPublisher: LAP Lambert Academic Publishing
ISBN: 9783659697043
Category :
Languages : en
Pages : 124
Book Description
Even since its discovery in 1948, the use of ductile iron is increasing continuously, this is due to the combination of its various excellent mechanical properties. Excessive amount of research is being carried out to develop even better properties. Austempererd ductile iron is the most recent development in the area of ductile iron or S.G. iron. This is formed by an isothermal heat treatment of the ductile iron. The newly developed austempered ductile iron is now replacing steel in many fields so it has becoming very important to various aspects of this material. In the present work the effect of copper along with the process variables (austempering temperature and austempering time) on the properties (Hardness, Tensile strength and Elongation) and microstructure of ductile iron is studied. With increasing austempering time hardness, tensile strength and elongation are increasing but with increasing austempering temperature hardness and tensile strength are decreasing and elongation increasing. Austempered ductile iron with copper is showing some higher strength, hardness and lower elongation than the austempered ductile iron without copper. In microstructure ferrite is increasing
Development of Nanostructured Austempered Ductile Cast Iron
Author: Saranya PanneerselvamPublisher:
ISBN:
Category : Materials science
Languages : en
Pages : 199
Book Description
Austempered Ductile Cast Iron is emerging as an important engineering materials in recent years because of its excellent combination of mechanical properties such as high strength with good ductility, good fatigue strength and fracture toughness together with excellent wear resistance. These combinations of properties are achieved by the microstructure consisting of acicular ferrite and high carbon austenite. Refining of the ausferritic microstructure will further enhance the mechanical properties of ADI and the presence of proeutectoid ferrite in the microstructure will considerably improve the ductility of the material. Thus, the focus of this investigation was to develop nanostructured austempered ductile cast iron (ADI) consisting of proeutectoid ferrite, bainitic ferrite and high carbon austenite and to determine its microstructure-property relationships. Compact tension and cylindrical tensile test samples were prepared as per ASTM standards, subjected to various heat treatments and the mechanical tests including the tensile tests, plane strain fracture toughness tests, hardness tests were performed as per ASTM standards. Microstructures were characterized by optical metallography, X-ray diffraction, SEM and TEM. Nanostructured ADI was achieved by a unique heat treatment consisting of austenitization at a high temperature and subsequent plastic deformation at the same austenitizing temperature followed by austempering. The investigation also examined the effect of cryogenic treatment, effect of intercritical austenitizing followed by single and two step austempering, effect of high temperature plastic deformation on the microstructure and mechanical properties of the low alloyed ductile cast iron. The mechanical and thermal stability of the austenite was also investigated. An analytical model has been developed to understand the crack growth process associated with the stress induced transformation of retained austenite to martensite.
Modelling the Microstructure and Mechanical Properties of Austempered Ductile Irons
Author: Miguel Angel Yescas-GonzálesPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Austempered Ductile Iron Production Technology from Base Material by Ferro-casting Industry in Indonesia
Author: Rianti Dewi Wulansari Sulamet AriobimoPublisher:
ISBN:
Category : Iron, Nodular
Languages : en
Pages :
Book Description
"The quality of Austempered Ductile Iron ADI, made from Indonesian-produced Ferro-Casting Ductile Iron, FCDI as base materual is discussed. FCDI that is made for routine consumption in Indonesia; not especially as ADI base material is assessed for chemical composition and mechanical properties. It is then austempered at austenisation temperature 950 degrees C with 1 hour holding. Three astempering temperatures 300, 350 and 400 degrees C, were investigated with 1 hour holding time using fluidized bed furnace. Metallographic examinations, tension tests and Brinell hardness number tests, were then carried out for the resulting ADI. Based on ASTM A897M-90 the products of austempering temperature 300 and 350 degrees C can be classified as ADI 850/550/10. This shows that the Indonesian-produced FCDI base material can be used for ADI production." -- abstract.
EVALUATION OF THERMAL STABILITY OF AUSFERRITE IN AUSTEMPERED DUCTILE IRON USING DIFFERENTIAL SCANNING CALORIMETRY
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Abstract : Austempered Ductile Iron (ADI) is prone to changes in microstructure and mechanical properties when exposed to elevated service temperatures. Differential Scanning Calorimetry has been used to evaluate the stabilizing effects of copper, nickel, molybdenum, and cobalt on the ausferrite structure. Previous studies have conflated the effects of various alloy additions, and little effort has been made to systematically catalog the effects of individual elements. The focus of the current research has been to identify alloying elements that more strongly stabilize the ausferrite structure in order to improve service life of ADI at elevated temperatures. Nickel has been shown to have a moderate stabilizing effect, while copper and molybdenum cause a much sharper increase in activation energy. Cobalt has a high stabilizing effect at 0.5% addition by weight, but a further increase to 2.36% results in a slight decrease in activation energy.
Index to Theses with Abstracts Accepted for Higher Degrees by the Universities of Great Britain and Ireland and the Council for National Academic Awards
Author: Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 314
Book Description
Author: Kathy L. Hayrynen