Improving of the structure of the heat affected zone deposited bimetallic tool material

Metallurgy and Materials

The structure and properties of the heat-affected zone of the 30CrMnSiА steel formed in the process of electric arc fusing of the high-speed R2М8 steel with direct current flux-cored wire in inert gas was investigated. The greatest decrease in hardness occurs at the area of overheating and full recrystallization, the second area of lowered hardness was found in the zone of high-temperature tempering. The possibility of increasing the hardness due to an increase in the rate of cooling of the HAZ metal with the reduction of heat input in the process of fusing with the use of double control of the transfer of metal in the arc is substantiated. The possibility of increasing the hardness of the metal in the HAZ is experimentally confirmed by controlling the thermal surfacing cycle.