Prospects for application of diffusion alloying for working bodies of construction and road machines

Road construction works have quite unfavourable conditions in terms of wear and tear. This situation is more caused by dry friction and the prevalence of abrasive wear. Therefore, parts that contact the working environment can be classified as fast-wear. One of the most effective ways to improve durability here is to use surface hardening. It is possible to use a cheap material on the surface of which a layer with improved mechanical properties is formed. The work deals with the use of grey iron with a reinforced layer to solve the above problem. The purpose of the work is to study the applicability of grey cast iron with a strengthened layer in the structures of working tools of construction and road machines. The work carried out experimental studies of wear resistance of parts made of ferrite-pearlite grey cast iron with a strengthened layer. On the basis of the calculations, the durability of the parts of the working tools containing wear-resistant inserts from the material under consideration is determined, it is shown that the use of the proposed solutions allows to obtain results comparable to the light high-strength iron and white iron. Issues of evaluation of weldability of wear-resistant inserts and steel base are also considered in the work. It is shown that it is possible to obtain a weld joint using manual arc welding. The results of the evaluation of economic ef-selectivity showed that the cost of bending wear-resistant elements from grey iron with a strengthened layer was lower than the use of hardening techniques (for example, build-up).