Carbon elements will normally appear in the cast iron in the process of slowly cooling depends on the structure of cast iron itself, among other things:<\/p>\n

1) If the iron be in solid solution in which the structure is ferrite. cast iron with this strutur usually slightly absorb carbon.
\n2) Under conditions where the iron to form a combined structure will cementtite (Fe3C), under conditions in which the transition occurs resulting in a structure with a combination of ferrite pearlite, so that the influence sementite itself in a free state.
\n3) The formation of the free carbon graphite (free carbon).<\/p>\n

Cast iron in which the entry of a number of elements of carbon with various nature will greatly affect the properties of the cast iron, and when all the elements of carbon bound with cast iron, cast iron structure will resemble steel, and cast iron which is thus referred to as white metal ( White Iron), iron is very hard and brittle (britle), but if the element carbon is only a means of free carbon does not occur between the ferrite with the chemical compounds of carbon and graphite formed only with the large volumes that result in changes in the structure becomes darker color or gray , then this is referred to as iron gray iron (gray iron), so this iron is weak because the graphite crystal occupies the boundary of the metal atoms of iron.<\/p>\n

To overcome this can be done through a process of heat treatment, which will change the structure of this iron as well as improve the mechanical properties of the metal, in which the intermediate degree of iron gray iron is often referred to as a “dotted” or “mottled-iron” Iron gray is slick ( self lubrication) and has a vibration absorbing properties.<\/p>\n

Control structure during cooling<\/strong>
\nBasically cast iron or steel which have the same behavior when heated above a critical temperature struturnya will change into a form specific structures depending on the speed of cooling.<\/p>\n

The process of solidification (solidification) directly on the cast iron will have the structure of austenite and cementite, where the compaction process occurs through slow cooling until it reaches room temperature. Austenite splits up into the form of a layer of ferrite and pearlite which cementite, while cementite splitting up into graphite and pearlite.<\/p>\n

If the cooling process is started soon enough then enough to prevent the formation of cementite, and will obtain the white structure. formation of white cast structure also depends on the range of cooling (cooling rate) which also depends on the thickness or thinness of the casting object itself, if the object casting thin white structure will be obtained, but instead would be obtained if the thicker gray structure, in which part would thickness slower the cooling process compared with that thin. basically this cooling rate can be set according to the needs of the final properties of the cast product that we want.<\/p>\n

However, the complex objects where it is necessary to vary the thickness of the method through which the cooling process can be evenly despite the different thicknesses. For that, the other parts which have a size of greater thickness should be placed a substance that helps the absorption of heat (chill iron-).
\nThe cast iron structure can also be controlled by controlling the chemical composition of the molten material, such as increasing the graphitization through the addition of silicon element in quantity but the parts are thin objects will be gray. Sulfur will increase the hardness at which the cast iron will lead to compaction in the form of a white cast iron.<\/p>\n

For casting objects that have complex shapes with the addition of the element Phosphorous thin up to 1% will result in faster molten iron, then cast the object element does not reach the expected voltage where the material will become brittle (britle).<\/p>\n","protected":false},"excerpt":{"rendered":"

Carbon elements will normally appear in the cast iron in the process of slowly cooling depends on the structure of cast iron itself, among other things: 1) If the iron be in solid solution in which the structure is ferrite. cast iron with this strutur usually slightly absorb carbon. 2) Under conditions where the iron …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[3080,3089,3086,3084,3081,3083,3087,3088,3085,3082],"class_list":["post-3956","post","type-post","status-publish","format-standard","hentry","category-besi-tuang","tag-iron-castings","tag-iron-castings-engineering-handbook-download","tag-iron-castings-engineering-handbook-pdf","tag-iron-castings-foundry","tag-iron-castings-handbook","tag-iron-castings-handbook-pdf","tag-iron-castings-research-institute","tag-iron-castings-scotland","tag-iron-castings-society","tag-iron-castings-uk"],"_links":{"self":[{"href":"https:\/\/www.tneutron.net\/blogs\/wp-json\/wp\/v2\/posts\/3956","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.tneutron.net\/blogs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.tneutron.net\/blogs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.tneutron.net\/blogs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tneutron.net\/blogs\/wp-json\/wp\/v2\/comments?post=3956"}],"version-history":[{"count":1,"href":"https:\/\/www.tneutron.net\/blogs\/wp-json\/wp\/v2\/posts\/3956\/revisions"}],"predecessor-version":[{"id":8906,"href":"https:\/\/www.tneutron.net\/blogs\/wp-json\/wp\/v2\/posts\/3956\/revisions\/8906"}],"wp:attachment":[{"href":"https:\/\/www.tneutron.net\/blogs\/wp-json\/wp\/v2\/media?parent=3956"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.tneutron.net\/blogs\/wp-json\/wp\/v2\/categories?post=3956"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.tneutron.net\/blogs\/wp-json\/wp\/v2\/tags?post=3956"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}