• A Ramalingam

      Articles written in Bulletin of Materials Science

    • Surface hardening of oil-hardened nonshrinking steel using ruby laser

      A Ramalingam B J Kalaiselvi S Sridharan P K Palanisamy V Masilamani

      More Details Abstract Fulltext PDF

      Surface modification of metals and alloys using lasers has acquired considerable importance because the changes achieved are highly localized and superficial. In this process the mechanical and structural properties of the bulk are retained as such because of the high temperature gradient and high rate of change of temperature that are unattainable by conventional methods. The present report is on surface hardening of oil-hardened nonshrinking (OHNS) steel using Ruby laser in normal mode. It is found that surface hardening increases thrice the size of base material and the microstructure of the laser-heated zone changes from pearlite phase to martensite phase.

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