T. K. Ajiboye

TL;DR: In this paper, the microstructure of the quenched carbon steel samples was studied using optical microscope and the tensile strength and hardness values were relatively higher than those of the ascast samples, suggesting improved mechanical properties.

Abstract: The importance of various form of heat treatment operations on medium carbon steel in order to forester the problem that may arise in making a wrong choice of these steel materials or faulty heat treatment operations which may give rise to serious disruption in terms of human safety, higher cost and untimely failure of the machine components is of great concern. The mechanical properties such as ductility, toughness, strength, hardness and tensile strength can easily be modified by heat treating the medium carbon steel to suit a particular design purpose. Tensile specimens were produced from medium carbon steel and were subjected to various forms of heat treatment processes like annealing, normalizing, hardening and tempering. The stiffness, ductility, ultimate tensile strength, yield strength and hardness of the heat treated samples were observed from their stress-strain curve. The value of the yield strength (σy) was observed to be higher for the tempered specimen possibly as a result of the grain re-arrangement, followed by the hardened, normalized and annealed specimens. The value of the ultimate tensile strength (σu) were also observed to be in the order; hardened> tempered>normalized>annealed.

TL;DR: In this paper, the authors used experimental methods based on orthogonal cutting process to measure the cutting forces using a dynamometer while machining the test specimen with a diamond cutting tool at 5° rake angle.

TL;DR: In this paper, the authors investigated the relaxed densities of biomass briquettes produced from combination of sawdust and charcoal, and they used cassava starch gel and orange waste as binder for briquetting.

TL;DR: In this article, the authors investigated thermal properties of Kapok, Bagasse, Coconut fibre and Sugarcane bagasse composite materials using molasses as a binder. And they reported that Bagasse has the lowest thermal conductivity followed by Kapok plus Bagasse (50:50), Kapok+Coconut fibre (50;40:10) and Kapok + Bagasse plus Coconut fibre (40;40):10), as well as a combination of Bagasse and Coconut fibre in ratios of 50:10:40, 50:40 and 50:30