Low-carbon steel in their structure provoked by laser radiation on two working regimes

Abstract

In this paper low-carbon steel which 3,8-4,2% Si and 0,08% C transformer plates exposed to the radiation of ruby laser in Q-switch and free generation regimes are examined. Investigations were carried out at atmospheric pressure under the laboratory conditions. Transformer plates were subjected to very high temperature gradients under heating and cooling conditions where the former is correlated to pulse characteristic and the later to material. Preliminary investigations were carried out by laser drilling and resulting traces on material were recorded by scanning electron microscope to find out the influence of different energies and pulse lengths on structural changes in the material, but wide application of transformer plates in electrical and mechanical engineering demands finding the regimes of thermomechanical processing and also the technology of cutting and connecting in the sense of conservation of magnetic characteristics.

U ovom radu ispitivanja su izvedena na niskougljeničnim čelicima sa 3,8-4,2% Si i 0,08% S koji su izlagani dejstvu rubinskog lasera u režimu gigantskih impulsa (Q-switch) i slobodne generacije. Ispitivanja su izvedena na atmosferskom pritisku u laboratorijskim uslovima. Transformatorski limovi su podvrgavani vrlo velikim temperaturnim gradijentima u uslovima grejanja i hlađenja, od kojih je prvi vezan za karakteristiku impulsa, a drugi za materijal. Preliminarna ispitivanja izvedena su bušenjem laserskim snopom, a ostvareni otisci na materijalu snimani su skaning elektronskim mikroskopom s ciljem da se definiše uticaj različitih energija i vremena impulsa na strukturne promene u materijalu, jer velika primena niskougljeničnih čelika sa 3,8-4,2% Si i 0,08% S u elektronici i mašinstvu zahteva definisanje režima termomehaničke obrade, a takođe i tehnologiju rezanja i spajanja u smislu očuvanja magnetnih karakteristika.