Surface engineering technology used in industry for surface Essay

Surface engineering technology used in industry for rally modification( i.e surface treatment-surface thermo-chemical tratment - Essay ExampleThis has been make feasible because steel is strong, flexible, and durable, thus, making it a suitable material for construction. However, there are instances where some modifications have to be made to the metal to make it suitable for some types of construction. The resolve to have steel that is strong, tough, wear, and shock resistant leads engineers to manipulate the surface of the metal, leaving its inner core constitutional (Davis, 2003). This process is called surface hardening of steel, and it can be done in many ways. Surface hardening techniques can be grouped into two important categories local thermal treatment and thermochemical processes. The choice of treatment to be used depends on engineering requirement s as surface as commercialised competition. In this section, this article presents an overview of the procedures used to harden the surface of steel. Each describes the procedures involved in the two categories. 1.1 Thermo-Chemical Processes Engineers modify the local chemical composition of steel at the surfaces by induction of nitrogen, carbon or both. Sometimes they may also use boron. The techniques used in this category depend on the method of kindle treatment applied and can further be broken down into four subcategories i. Pack processes such as metalizing and pack carburizing ii. Salt-bath processes such as carbonitriding (cyanide hardening) iii. aerosolised processes such as gas nitriding and gas carburizing iv. Vacuum based processes including ion nitriding, carburizing, and plasma nitriding The most salient features of these processes are the processing temperature, mechanical properties and depth of the case, as well as the service behavior of the cases core composite. Temperature is particularly significant because it affects the level of distortion directly. 1.1.1 Nitriding This can o nly be done on materials that have already been hardened and tempered. It produces better results when used with a range of alloys of steel that form stable nitrides such as vanadium, aluminium, tungsten, chromium, and molybdenum. The resultant nitrides are scatter evenly throughout the surface of steel. Figure 1 Schematic diagram of a nitriding process. The process occurs at around 540 degrees Celsius where distortion does not take place. The nitride bed on the surface of the metal makes it expand, thus creating large, compressive stresses that in turn increase surface hardness and improve fatigue strength. In addition, the process also results in steel that has a reduced friction coefficient. Nitriding is, therefore, the best method to use when developing surfaces that are intended to minimize friction such as drinking glass shafts and ball bearings. Advantages of Nitriding 1. It is easy to control the nitrogen