The influence of additives of lanthanum hexaboride nanoparticles on the cast structure of high-chromium steel of austenitic and martensitic classes

International Conference on Innovations and Prospects of Development of Mining Machinery and Electrical Engineering 2018

矿业工程;电工学

Razumova, L.V.^1 ; Romashkin, A.N.^2 ; Kolpishon, E.Y.^2 ; Tolochko, O.V.^1 ; Popovich, A.A.^1

National Technology Initiative Center of Excellence in Advanced Manufacturing Technologies, Peter the Great Saint-Petersburg Polytechnic University, Polytechnic st. 29, St.-Petersburg

195251, Russia^1

JSC NPO TSNIITMASH, Sharikopodshipnikovskaya st. 4, Moscow

115088, Russia^2

关键词: Austenitic;    Carbonyl iron;    Cast structures;    Dendritic structures;    High-chromium steel;    Lanthanum hexaborides;    Nano-sized powder;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/194/3/032024/pdf
DOI  :  10.1088/1755-1315/194/3/032024

来源: IOP

【 摘 要 】

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.