Ever Increasing Market Of Ductile Iron In Automotive Sectors

Austenite is a metallic substance with no magnetic features like the iron solid solutions, iron with added alloying substances and iron allotrope. In plain steel or in carbon steel, austenite is found over the climacteric temperature that reaches the highest degree. Many steel alloys have different degrees of temperature. Austentization can be defined as steel or heating iron till reaching the temperature in which the crystal structure gets transformed from ferrite to austenite.

In a traditional process of austempering, castings are firstly heated into Austenite phase field and held for long enough to ensure a fully austenitic matrix structure with a uniform carbon content. Austempered Ductile Iron is a function of the austenitizing temperature and affects the consecutive transformation to ausferrite. The classic parameters are 1 hour at 900 degree centigrades. However, it should be noted that, upper critical temperature varies with the composition, so this must be modestly controlled to avoid the need to adjust the austenitizing temperature. Common austempering cycle used for ductile iron.

There have been a number of studies of mechanical properties of Austempered Ductile Iron and it is clear that these properties depend on a number of inter-linked factors as well as the austempering and austenitizing times and temperatures. These include the following - the composition, the section size and cast structure. The austempering temperature is most important in all of these. The common tensile properties of ADI work as a function of austempering temperature. All the variations in these properties can be related to the changes in micro-structures.