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Effect of Alloying on Material Properties

Effect of alloying on material properties

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Unformatted text preview: EFFECT of THE INDIVIDUAL ALLOYING ELEMENT ON THE MATERIAL PROPERTIES By : Farid Moch. Zamil 1. Constant Fe Alloying elements : C ; Si ; Mn.. (a). Carbon ( C ) 0 1.5 % (2.3 %) Most important alloying element, strongly increasing the tensile strength and wear resistance; decisive for hardenability and maximum hardness of tool steels. Content for different steel grades : 0.01 0.10 % Steels with good forming capabilities, such as deep drawing steels ; corrosion resistant ; not magnetising steels ; steels for case hardening. 0.15 0.35 % General contruction steels with good tensile properties such as elevated contruction steel, free machining steel. 0.40 0.80 % High tensile construction and tool steel such as heat treateble steels, hot work steels, spring steels. 0.80 1.40 % Tool steels, wear resistance steels. 1.40 2.10 % Highly Stressed cold work steels, high speed steels. (b). Silicon ( Si ) 0.20 1.6 % (14 %) (Alloying Element) Alloying and De oxidation element (NMI Si Oxide), strongly increases tensile properties, high elaticity limit (spring steels) ; Above 2 % Si only a more limited elongation. Over 4 % practically unformable, increase in wear resistance. Hardness scaling and corrosion resistance ; Above 10% Si (only castable ) acid resistant ; for magnets, soft parts (dynamo and transformer sheets) ; Si promotes graphite formation from cementite. Si is the primary alloying element after C in grey cast iron. (c). Manganese (Mn) 0.30 2 % (12 - 20%) (Alloying Element) Alloying and De oxidising and De Suphuring element (NMI Mn MnS), strongly increases tensile properties ( 10 N/mm2 per 1% Mn), greatly diminishes critical cooling rate and thus increases depth of harderning ; Mn improves the impact strength (low temperature steels). >18% Mn steels remain non magnetic. > 12% Mn for wear-resistant parts (high cold work harderning, Mn-hard steels). < 6% in corrosion resistant Cr Ni Steels. < 2% in low construction parts. < 1% in all non alloy steels.\ D:\Private\Article\Material\Alloying.doc Fari...
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