Рroperties of wear resistance nickel-free steel with secondary curing for building up stamps of metal hot processing

Abstract

Problem. The problem, i.e. the reduction of energy and resource consumption during surfacing of a stamping tool can be solved by using dispersion-hardening alloys, limitedly alloyed with chromium (up to 3%), increasing the amount of carbide phase due to the introduction of carbide-forming elements, replacing nickel with manganese, and using surfacing with a de-current additive for their application. The purpose of the work is to increase the wear resistance and heat resistance of secondary hardening surfacing steels by improving the composition of alloying powder wires due to the optimization of the content of titanium, molybdenum and chromium. Methodology. Surfacing was performed with a TS-17M welding tractor under a flux of flux-cored wires with a de-energized additive fed into the main part of the welding bath. Surfacing modes – Iд≈300......320 A; Ud≈34...36 V; Un≈23.7 m/h; Up.e.≈93.75 m/h. The participation rate of the de-energized additive varied within 0...75%. Results. The increase in the content of the [TiC] phase contributed to the increase in the heat resistance of Cr-Mn-Ti alloys based on iron. The introduction of [Mo] stabilized the value of hardness at elevated temperatures, increased heat resistance and hardness during dispersion hardening and additional diffusion formation of the carbide phase during aging. Originality. To increase the alloying of the deposited metal, surfacing with de-current additive was proposed, which allowed to increase the assimilation coefficients of alloying elements. Practical significance. Production tests of stamps welded with these steels made it possible to increase their durability by 1.8 times compared to 5KHNM steel.