Effect of Alloying on Material Properties

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Unformatted text preview: (g). (h). (i). (j). (k). D:\Private\Article\Material\Alloying.doc Farid 11:16 PM Page 3 21/08/2009 EFFECT of THE INDIVIDUAL ALLOYING ELEMENT ON THE MATERIAL PROPERTIES By : Farid Moch. Zamil magnet steels ; stabilising element (combining C and N) in intergranular susceptible corrosion resistant steel. (l). Vanadium (Vi) (Alloying element). Strong carbide forming element, increasing wear resistance, edge holding properties, high temperature resistance and retention of harderness (secondary hardness) in tool and high speed steel, refines grain, overheating sensitivity, increases welding properties of heat treatable steels. < 1.00 % in low alloy constructional and tool steels. < 2.00 % in hot work steels. > 2.00 % in high speed steels. 3. Undesirabel Elements (Detrimental to Steel) (a). Arsenic ( As ) ( Detrimental ). Strong tedency toward segregation, lower impact strength, detrimental to welding. (b). Phosphorus ( P ) ( General Detrimental to Steel ). Strong tedency toward segregation, lower impact strength, causes cold shortness, limits weldability (low melting eutectics). In limited quantities in constructional steels, the tensile strength and resistance to atmospheric corrosion are increased. P in Cr Ni steels yield precipitation effects. P in grey casting increases fluidity (used in casting for art). (c). Lead ( Pb ) ( General Undersirable ). Sometimes added in amount of < 0.50 % in free cutting steels for the formation of short chip length. (d). Sulphur ( S ) ( General Undersirable ). Strong segregation ; low melting eutectics lead to red shortness, lower weldability, inhibited impact strength in tranverse formation direction. < 0.20 % is added to free cutting steels for formation of short chips (sulphide inclusions). (e). (f). Antimony ( Sb ) ( Detrimental, similar effect as AS - Arsenic ). Tin ( Sn ) ( Detrimental ). Produces solder brittleness, build up below oxide layer, strong segregation. D:\Private\Article\Material\Alloying.doc Farid 11:16 PM Page 4 21/08/2009 EFFECT of THE INDIVIDUAL ALLOYING ELEMENT ON THE MATERIAL PROPERTIES By : Farid Moch....
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This note was uploaded on 03/17/2010 for the course ME ME78212 taught by Professor Prof.sulis during the Spring '10 term at Institut Teknologi Bandung.

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