Re-melting is a surface modification technique in which high energy beam like laser or electron beam (EB) is exposed to the surface of a component, results in thin area of molten metal. Rapid melting and cooling causes change in microstructure helps to improves surface properties.
This paper focuses on to study the effect of EB surface remelting on hot work tool steel. Electron beam remelting treatments were applied on tool steel specimens by varying scan speed and performance was analyzed by measuring hardness and case depths. The microstructural evolutions during EB remelting were evaluated by using scanning electron microscope (SEM). Additionally, pin on disk wear test executed to understand wear behavior of these specimens. It was observed that, EB remelting modifies surface microstructure to ultra-fine grain size which improves hardness and wear resistance. At the end, melting and case depths were correlated with the scan speed of the electron beam.