tag:blogger.com,1999:blog-82310114031485870432024-09-07T04:35:48.013+05:30It covers fundamentals of machine tools and engineering materialsUnknownnoreply@blogger.comBlogger6125tag:blogger.com,1999:blog-8231011403148587043.post-82760404855056307392011-10-14T16:11:00.000+05:302011-10-14T16:11:36.109+05:30

Important Properties of cast Iron (1) Machinability. Cast iron has broad range of machinability, i.e., from very good to the most unmachinability. Annealed permanent mould iron has got the highest machinability as the carbon in such a cast iron is in the state of finely divided and dispersed graphite flakes and not in the combined state as carbide, and moreover it is free from burned-in sand at

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1. Chilled Casting. The mould used for chilled casting is either of a metal having high melting point or the mould may be given a lining of such a metal. This results in rapid conduction of heat from the surface of the casting with the result that the casting will have harder outer surface and softer inner core, Chilled castings are very useful in making railway carriage wheels. 2. Centrifugal

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1. Phosphorous. The quantity of phosphorous present in pig iron varies from 0.1 to 2.0%. It combines with iron to form Fe3P which embrittles cast iron. Phosphorous is introduced into iron from phosphate in the ore. Phosphates get reduced in the reducing atmosphere in the blast furnace and phosphorous is formed. This phosphorous combines with iron to form Fe3P. Some of the phosphorous may get

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Most important commercial form of iron are : Pig iron. It is the product of  the blast furnace and is made by the reduction of iron ore. Cast iron. It is an alloy of iron containing so much carbon that , as cast, it is not appreciably malleable at any temperature. Malleable cast iron. It is made by changing all the combined carbon in a special white cast iron to free or  temper carbon

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Iron has three allotropic forms of crystal at different temperature. It undergoes all the allotropic forms when it is heated  from normal temperature to high temperature (molten state). 1. Alpha Iron. It occurs from normal temperature to 910 degree centigrade and has got body-centered cubic (b.c.c.)lattice crystals. (i) Ferromagnetic alpha iron which occurs from normal temperature to

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 Engineering materials can be classified as (1) metallic materials and (2) non-metallic materials. Metallic materials are further classified as (1) ferrous metals,basically iron and iron alloys and (2) non-ferrous materials and alloys. Rubber,wood,concrete,ceramics,plastics etc. constitutes non-metallic materials.  For any particular engineering application,  these materials are

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