Abstract
The paper presents the results of studying the influence of lanthanum hexaboride, modified with nanosized powder, on the cast structure of martensitic and austenitic steel, aluminium and silicon killed. A study was carried out on high-chromium steel 08H18N12 and 10H9MFB. As the addition, there were used compressed tablets containing different amounts of nanosized powder of lanthanum hexaboride and carbonyl iron. The conducted research allowed to conclude that the use of lanthanum hexaboride atomizes the dendritic structure of high-chromium steel of martensitic and austenitic classes. Furthermore, it is established that lanthanum hexaboride can be an effective means of introducing boron into high-chromium steel, including nitrogen-containing one. In addition to the above, lanthanum hexaboride actively interacts with sulfur and thus forms primary lanthanum sulphides which are the substrate for forming complex oxysulphides.
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