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
This study on working capital management as a tool for business survival was carried out to examine the impact of working capita...
INTRODUCTION
This study evaluates Nigerian press reportage of political campaign during the 2011 p...
ABSTRACT
The study is aimed at determining the impact of computerization of microfinance bank in Nsukka...
BACKGROUND OF THE STUDY
Although infrastructure investment is widely seen as a critical engine of economic growth,...
Abstract
Nigeria is still battling with the problem of insurgency. Pictures of bloody acts of violence by insurgents are shown. Insurgenc...
ABSTRACT
Comparative in vitro bioequivalence study of biopharmaceutics class I and III drugs hadgained prominence in recent times. In vit...
BACKGROUND TO THE STUDY
Drug abuse is a social problem of great concern in our society like other social problems; drug...
Abstract
The rising wave of incidence of commercial sex work has given serious concern to the government, parents, heal...
STATEMENT OF RESEARCH PROBLEM
It has always been a problem to ascertain whether or not advertising has any correl...
Abstract: THE IMPACT OF AUTOMATION ON LABOR COSTS IN NIGERIA'S AUTOMOBILE INDUSTRY
This research investigates the impact of automatio...