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Engineering MaterialsExplain the purpose of alloying in steels, naming at least four common alloying elements and summarising their main effects on mechanical properties.20257mEngineering MaterialsWrite the composition, properties and applications of: (i) grey cast iron and (ii) white cast iron.20247mEngineering MaterialsName the important heat treatment processes of steel. Explain any two of them with neat sketches.20246mEngineering MaterialsWhat is steel? Distinguish between hypoeutectoid and hypereutectoid steels.20248m