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Bead-light ferrite grey cast iron fittings
Grey cast iron is a kind of cast iron. Carbon exists in cast iron as sheet graphite. The broken mouth is gray. Have good casting, cutting performance, good wear resistance. For manufacturing racks, boxes, etc. Grey cast iron graphite is sheet, the effective bearing area is relatively small, the graphite tip is easy to produce stress concentration, so the strength, plasticity and toughness of gray cast iron are lower than that of other cast iron. However, it has excellent vibration damping, low notch sensitivity and high wear resistance.
Grey cast iron has a high carbon content (2.7%~4.0%), which can be regarded as the matrix of carbon steel with sheet graphite. According to the matrix organization of different grey cast iron is divided into three categories: iron matrix grey cast iron; pearl ferrite matrix grey cast iron; pearl matrix grey cast iron.
Pearl-ferrite gray cast iron is in the bead and ferrite mixed matrix, distributed with relatively thick graphite sheet, the strength and hardness of this cast iron is lower than the former, but still can meet the requirements of the general body, its casting, shock absorption are good, and easy to melt, is the most widely used gray cast iron.
The different microorganization of grey cast iron is essentially the different form of carbon in cast iron. The carbon in gray cast iron is composed of combined carbon (Fe3C) and graphite carbon. When combined carbon is 0.8%, it is gray cast iron; when combined carbon is less than 0.8%, it is ferrite gray cast iron; when all carbon is in graphite, it is gray cast iron.
The mechanical properties of gray cast iron are related to the organization of the matrix and the morphology of graphite. The sheet graphite in gray cast iron seriously separates the matrix, which is easy to cause stress concentration at the graphite tip Angle, so that the tensile strength, plasticity and toughness of gray cast iron are far lower than that of steel, but the compressive strength is equal to that of steel, and it is also the cast iron with the worst mechanical performance in commonly used cast iron. At the same time, the matrix tissue also has certain influence on the mechanical properties of grey cast iron. The graphite sheet of gray cast iron is thick and the graphite sheet of the matrix has high strength and hardness, and is mainly used to make important castings; the graphite sheet of gray cast iron of the matrix is slightly larger than the gray cast iron, which is inferior to the gray cast iron. Therefore, the gray cast iron of the bead light body matrix is more commonly used in the industry.
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