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Influence of Silicon and Cobalt Laser Alloying on the Microstructure and Nanomechanical Properties of the Gray Cast Iron Surface Layer

Paczkowska Marta

Journal of Research and Applications in Agricultural Engineering

2022

Vol. 67, nr 2

13--19

The aim of the research was to modify the surface layer of flakc iron by laser alloying with composition of elements: Si and Co and the evaluation of the obtained effects (regarding the changes in the surface layer microstructure and its chosen properties). In the first part, the treatment consist on covering the cast iron surface with the alloying composition layer, and in the second part – heating of this surface with laser beam using molecutar laser. The treatment effects were estimated with: SEM, EDS, hardness tester, nanoindentalion tester and surface profile device. Il was started (among others), that the alloyed zone in the surface layer flake iron after performed laser treatment was gained and it was characterized by following features (in comparison to the core material): fine and homogencous microstructure with some similarities to the hardened white cast iron, presence of Co and increased amount of Si. lt was noticed that such properties as hardness and Young's modulus have been increased.