Criteria for the selection of hard-facing materials for the restoration of parts
DOI:
https://doi.org/10.37142/2076-2151/2022-1(51)196Keywords:
machine parts, shock-abrasive wear, alloying system, surfacing, rare-earth metals, self-shielded flux-cored wire.Abstract
Grin O., Trembach I. Criteria for the selection of hard-facing materials for the restoration of parts
The analysis of literature data showed that for the operating conditions of machine parts under shock loading, the main alloying system is Fe-C-Cr-Mn, which provides high shocl resistance due to the formation of an austenite microstructure with dispersed carbides. The additional introduction of rare earth metals and their oxides is promising. An analysis of modern materials and alloying systems for surfacing a tool subjected to metal-to-metal friction in the presence of an impact was made. The optimal alloying system has been determined, which will ensure increased wear resistance during the restoration and strengthening of parts that are subjected to shock with the friction of metal working surfaces. Based on the analysis of literature data, the choice of the alloying system is substantiated in order to increase the wear resistance during restoration and strengthening of the surfaces of parts that are subject to shock-abrasive wear. Determining the optimal alloying system for surfacing machine parts made of high-manganese steel operating under conditions of shock-abrasive wear significantly simplifies the task of developing economically alloyed surfacing materials. Based on the analysis of literature data, it is shown that alloys with a structure of martensite and martensite with carbides are recommended for conditions of fatigue wear, as well as during rolling/sliding and impact, thermal impact. It is shown that for the conditions of operation under shock loading, the main alloying system is the Fe-C-Cr-Mn system, which is additionally alloyed with Mo, V, Cu, B, and for the deposited surface, which undergoes metal-to-metal friction at in the presence of a shock it is advisable to use the Fe-C-W-Mo-V system. In both cases, an increase in the operational properties of the metal can be achieved by the additional introduction of rare earth metals and their oxides.
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