ABSTRACT
This study has evaluated the effectiveness of metallic materials as chill in sand casting of aluminium alloy. Four plates of dimension 165mm x 80mm x10mm were cast using sand mould. Steel, copper and brass chills in form of cylindrical bar of geometry 7mm in diameter and 50mm long were inserted, side by side at regular intervals of 30mm in each sand mould and the last sample was left unchilled. Experimentation involved testing of mechanical properties and metallographic analysis of cast samples. The results obtained revealed that the sample chilled with copper has the highest mechanical properties (ultimate tensile strength of 126.13MPa, hardness of 6.8Hv and impact strength of 23.5J).Also sample chilled with copper revealed evenly distributed microstructure which is due to the fast solidification rate of the casting due to the high thermal conductivity of copper. The brass chill sample displayed better mechanical properties (ultimate tensile strength of 115.8MPa, hardness of 5.7Hv and impact strength of 22.4J) than sample chilled with steel (ultimate tensile strength of 101.33MPa and hardness of 5.4Hv). However, the unchilled sample showed the lowest ultimate tensile strength of 70.67MPa, hardness of 4.2Hv and impact strength of 22.5J.
ABSTRACT
The study investigated the effect of Intrinsic and Extrinsic Motivation Strategies on students writing skills performance in jun...
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This study critically analyzes the impact of the concept of ijbar on the practice of child marriage under Islamic law. While chi...
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The purpose of this work was to find out the effects of stress on the secretary’s job performance. A ques...
Background of the study
Work was the major activities of man before the industrial revolution, that was the period...
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The divergent opinion on the financial reporting practice of pension funds administrators has been an ongoing...
Abstract
This study is on strategies for improving low academic performances in English language in secondary scho...
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The project examines the structure of the Nigerian capital market and its impact on economic development in Nig...
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The need for industrialization has become one of the problems facing Nigeria. Not with standing that industrial...
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The study assessed the role of middlemen in the marketing of paddy rice in Kwande Local Government Area of Benu...
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Alcohol and substance abuse is among the most commonly reported adverse psychological problems for young women...