Paper Title
MICROSTRUCTURE DEVELOPMENT OF LOW CARBON STEEL SURFACE HARDFACED WITH CHROMIUM CARBIDE ALLOY

Abstract
In this investigation, the microstructure changes of 0.25% low carbon steel, which is hardfacedwithhigh chromium iron by semiautomatic welding process was studied using OM, SEM, XRD and EDSanalysis. Mechanical properties, such as hardness and wear rates also investigated. Four groups of samples were used in the study. First group of samples was low carbon steel without any surface treatment. Second, third and fourth group of samples were selected from a number of hard-faced low carbon steel pieces with 3.0, 3.4 and 3.8 % of chromium contents respectively. SEM and XRD analysis results show that the microstructure of the surface treated samples consist of a little of ferrite and much of pearlite. EDS test shows the chromium contents of both of ferrite and pearlite have increased significantly. Increasing of pearlite amount and increasing the chromium concentration in every phases affect to increase of hardness from 280 to 495 HV30. Chromium content was increased in both pearlite an ferrite. This increasing causes the phases hardness to be increased. Also there is some trace of М7С type carbides appeared in hardfaced surface with higher chromium content. Keywords - Low carbon steel, microstructure, phase, hardness, chromium, carbon