Microstructure and hardness studies of electron beam melted surface of mild steel

• Published in: Applied surface science 2009-04, Vol.255 (13), p.6721-6723
• Main Authors: Ahmad, M., Haq, M.A., Ahmed, Ejaz, Ali, G., Akhter, J.I., Iqbal, M.
• Format: Article
• Language: English
• Subjects: Composite materials; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Electron microscopy; Electrons and positron radiation effects; Exact sciences and technology; Hardness; Mechanical and acoustical properties; Metals and alloys; Physical properties of thin films, nonelectronic; Physical radiation effects, radiation damage; Physics; Radiation effects on specific materials; Structure of solids and liquids; crystallography; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties); X-ray techniques
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2009.02.077

Electron beam surface melting of mild steel with the addition of Ni and SiC is carried out to improve its surface properties. Microstructure of the electron beam molten surface is characterized by scanning electron microscope. Phases are determined using energy dispersive spectroscopy and X-ray diffraction techniques. During electron beam melting SiC dissociated partially, interacted with liquid alloy and resulted in martensitic phases after solidification. Maximum hardness is achieved in electron beam molten zone. It is concluded that the formation of martensitic phase and the presence of Si and Ni in the solid solution are responsible for increase in hardness in the molten zone.