This thesis describes the general properties of steels, heat treatment – quenching and tempering, as does basics of harness. Thesis is based on testing and evaluating the hardness of four steels: C10, C15, C60 and 16MnCr5. We discussed the influence of carbon and other alloying elements based on hardenability and displayed them with empirically obtained data. Hardenability is evaluated with Jominy test as with Grossman hardenability test and the effect of tempering on hardness is shown. Obtained microstructure before and after tempering in relation to hardness is also displayed. We then compared individual materials. We considered that the maximum hardness produced increases in proportion to carbon content and the depth of hardenability increases with proportion of other alloying elements.
|
