Abstract
The aim of this research is to study the effects of pack carburizing using charcoal on properties of mild steel. The properties are represented by the results of microstructure, hardness test and tensile test. The carburizing process was conducted in the temperature of 930oC which is the austenite temperature of the mild steel. The source of carbon was charcoal. The specimens were held for 2, 3 and 4 hours at the carburizing temperature. The carbon content of the raw amterial was 0.17%. The raw material was hypoeutectoid steel with ferrite and pearlite phases in its microstructure. After the carburizing process, the microstructure can be divided into two zones e.i. case zone and core zone. The case zone consists of hypereutectoid, eutectoid, and hypoeutectoid sub-zone. The core zone is the same as raw material. The longer the holding time will result in the deeper the case zone and the stronger the material.
Highlights
Carburizing is the process of saturating the surface layer of steel with carbon
Investigation was conducted by Aramide et al.[2] into the mechanical properties of mild steel subjected to packed carburization treatment using pulverized bone as the carburizer
The results showed that the holding time of the carburizing process influences the fatigue strength of the material
Summary
Carburizing is the process of saturating the surface layer of steel with carbon. In accordance with carbon source, carburization is classified as pack carburizing, gas carburizing and liquid carburizing. Investigation was conducted by Aramide et al.[2] into the mechanical properties of mild steel subjected to packed carburization treatment using pulverized bone as the carburizer. The work by Oyetunji and Adeosun[3] evaluates the suitability of using palm kernel shell, animal bone (mammalian bones from cattle) and sea shell (oyster shell) materials as carburizers for case hardening of 0.078% C mild steel. The results of the carbon analysis show that palm kernel shell and animal bone are potentially suitable to be used as a carburizing media than the sea shell at high temperatures (above 10000 C) with holding time above 1 hr. The work has investigated the potential of some organic waste materials for surface hardness improvement of mild steel. Waste organic materials like sugar cane, rice husks, egg shell, melon shell, arecaceae flower droppings, plastics, polyethylene, and charcoal were used during the
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