Lab 2 309


Heat treatment is the act of altering the properties of a substance through the application of heat. The increase in temperatures causes the change of physical properties and at sometimes the chemical properties depending on the degree of temperature change (Wojes, 2017). It is important to note that heat treatment involves both reduction and increase of temperatures. The end results of heat treatment include hardening and softening of the experimental material. Metallic elements consist of microstructures called grains or crystallites for crystalline components (Leslie, 1972). The mechanical behavior of the grains depends on its nature such as the size and composition of the material. Heat treatment is majorly involved in the determination of the mechanical characteristic. This is because, as itcontrols the rate of diffusion and the rate of cooling, the materials microstructure is affected. Johnson Heat treatment, as used in manufacturing shops, is a way to educate students on the application of heat treatment and its applications. The heat treatment method is used for several purposes such as tempering, cooling, and quenching. The processes mentioned above affect the hardness (Lee, Katherine Bakeev, & Christos Malliakas, 2005).

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