DEVELOPMENT AND RESEARCH OF A NEW MATERIAL FOR STRENGTHENING THE WORKING TOOLS OF AGRICULTURAL MACHINES BY INDUCTION SURFACING
Taking into consideration the nature of wear, the presence of a cutting edge on most of the working tools of agricultural machines as well as the need to maintain a given shape and size - their strengthening, protection against the harmful effects of the processed material and environmental factors are always urgent tasks. A study was carried out on the possibility of obtaining a new hardening material for induction surfacing, the Fe-Si-C-Cr-Cu-Mn-Ni system by a metallurgical method as well as a study of the structure and properties of hardening coatings by induction surfacing. To obtain a new hard alloy, a mixture of two cast irons was used: ferrosilide FS-17, and sormite No. 1; in addition, to reduce fragility, electrical copper M1 (all compounds - in Russian) was introduced into the material. The alloy composition is as following, wt. %: ferrosilide FS-17 - 60-70, sormite No. 1 - 25-20, copper M1 - 15-10. The alloy has a 5.8-8.8 times lower chromium content as compared to the currently used materials of the Fe-Cr-C, Fe-Ni-C and similar systems, i.e. it is economically high-hardened. During induction surfacing of a new alloy on 65Mn steel specimens, a hardening coating with hardness of 830-920 HV<sub>100</sub> is formed.