THE EFFECT OF ALLOYING, MICROALLOYING AND MODIFICATION ON THE PROPERTIES OF WEAR-RESISTANT CHROME MANGANESE CAST IRON
Procesi littâ, 2025, Vol 3 (161), 52-61
DOI:
https://doi.org/10.15407/plit2025.03.052Keywords:
wear-resistant cast iron, hydroabrasive wearing, alloying, microalloying, modification, chromium, manganese, titanium, rare earth metals, carbidesAbstract
The paper presents the results of a study of the influence of chemical composition on the wear resistance of high-alloy cast irons operating under conditions of waterjet wear. The expediency of using chromium-manganese cast irons as a material for the manufacture of cast parts for ash removal systems of thermal power plants is substantiated. The main attention is focused on the study of the influence of chromium, manganese, titanium, and rare earth metals on the structure, hardness, and wear resistance of cast irons. The optimum content of alloying elements such as chromium and manganese, which will ensure maximum wear resistance of the experimental cast iron, was determined. The influence of microalloying of high-alloyed chromium-manganese cast iron with titanium and modification with rare earth metals was determined. The influence of structural components and morphology of carbides on the performance properties of cast iron has been studied. It is shown that the most effective is the structure of cast iron with carbides of the (Cr,Fe)₇C₃ type, evenly distributed in a martensitic or hardened base, as well as stabilized residual austenite capable of hardening during wear. It has been established that the introduction of 18-20 % Cr and 3.5-4.5 % Mn increases the wear resistance of the experimental cast iron by 20-25 % compared to the reference wear-resistant Cr28Ni2 alloy. It has been established that microalloying with titanium in the range of 0.4-0.6 % can further increase the wear resistance of cast iron by 15-20 % due to the formation of dispersed hardening carbides and carbonitrides. The addition of rare earth metals in the amount of 0.2-0.4 % helps to purify the metal from non-metallic inclusions, change their morphology, and improve mechanical properties. The optimal composition of wear-resistant cast iron has been proposed, which is advisable to use for the manufacture of screw conveyors, knees of pulp pipelines, impellers, housings, and disks of baghouse pumps that operate in direct contact with the pulp and are subject to water-abrasive wear in ash removal systems. The results can be used to further improve cast products and various technologies for strengthening their working surfaces.
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Copyright (c) 2025 І.В. Лук’яненко, Б.В. Кивгило, Є.Г. Биба, М.М. Ямшинський, О.Г. Ковальчук
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