What is nodularity in cast iron?
Nodular Cast Iron, also referred to as ductile iron or spheroidal graphite iron, is a group of irons in which the graphite forms as nodules (spherical) instead of flakes as in normal cast iron. Nodulizing elements, typically magnesium, are used to allow the solidification of the graphite into nodules.
What is pearlitic cast iron?
Spheroidal graphite cast iron usually has a pearlitic matrix. However, annealing causes the carbon in the pearlite to precipitate on to the existing graphite or to form further small graphite particles, leaving behind a ferritic matrix. This gives the iron even greater ductility. All samples are etched using 2% nital.
Is nodular iron the same as cast iron?
The difference between traditional cast iron and modern-day ductile iron is the shape of the graphite. While cast iron has small flakes of graphite, ductile iron contains spherical graphite nodules. Because of the spherical shape of the graphite, ductile iron is often called spheroidal iron or nodular cast iron.
What cast iron has nodular of spheroidal graphite?
Ductile iron
Ductile iron, also known as ductile cast iron, nodular cast iron, spheroidal graphite iron, spheroidal graphite cast iron and SG iron, is a type of graphite-rich cast iron discovered in 1943 by Keith Millis.
Is nodular iron stronger than cast iron?
Nodular (spheroidal graphite) cast iron Nodular iron is also called ductile iron. The graphite is present as tiny balls or spheroids. Because the spheroids interrupt the matrix much less than graphite flakes, nodular cast iron has higher strength and toughness than gray cast iron.
What are the advantages of nodular cast iron over gray cast iron?
Nodular iron has higher strengths, greater elongation and better resistance to impact than grey iron. The nodular iron family offers the design engineer a unique combination of strength, wear and fatigue resistance and toughness as well as excellent ductility characteristics.
Which of the cast iron Cannot be machined?
White cast iron is formed when the carbon in solution is not able to form graphite on solidification. White cast irons are hard and brittle; they cannot easily be machined. They are unique in that they are the only member of the cast iron family in which carbon is present only as a carbide.
What are the advantages of nodular cast iron over GREY cast iron?
What is difference between cast iron and GREY cast iron?
The difference is that white cast iron features cementite below its surface, whereas gray cast iron features graphite below its surface. The graphite creates the appearance of a gray color, while the cementite creates the appearance of a white color.
What is nodular cast iron give its application?
Nodular cast iron is a material that has found a increasing number of applications in the automotive industry during the last decade. It has a static strength comparable to cast steels and a greater fatigue strength and ductility than grey irons.