Структура нержавеющей стали после воздействия импульсных плазменных потоков

Abstract

В данной работе представлен анализ структурно-фазовых изменений в образцах нержавеющей стали, обработанных импульсными плазменными потоками. Изучена последовательность фазовых переходов в модифицированных слоях в зависимости от кратности обработки. Изменения в структуре исследуемых конструкционных сталей, связанные с формированием новых фаз и микроискажениями в кристаллической решетке, исследованы методом РСА. Показано, что после обработки разным числом выстрелов в образцах нержавеющей стали происходит плазменное травление и перераспределение кристаллитов = Surface hardening technologies are based on a modifying effect on the metal surface by pulsed energy, radically changes its structure and properties. Pulsed plasma treatment is one of the effective methods for modifying the surface of a solid. Earlier the changes of structure of ordinary and stainless steels were made by processing on the KPU-30 accelerator. In ordinary carbon steels, a strong decrease in the crystallite size is observed with increasing energy, this does not occur in stainless steels. In addition, iron nitride under the influence of nitrogen plasma was uniquely identified only in stainless steel. Thus, in order to find out the reason for the hardening of materials, it is necessary to conduct research on materials that combines the properties of both carbonaceous and stainless steel, and produced by the same technology. This paper presents an analysis of structural-phase changes in samples of AISI 321 (12Х18Н10Т) and AISI 201 (12Х15Г9НД) stainless steel samples treated with pulsed plasma streams. The sequence of phase transitions in modified layers is studied depending on the multiplicity of the treatment. It is shown that after processing with a small number of shots (n = 2), plasma etching and redistribution of crystallites occur in stainless steel samples. With a tenfold processing, the structure of the near-surface layer becomes more ordered, nanoscale columnar blocks appear uniformly along the surface and their tracks are located predominantly along the grain boundaries. Changes in the structure of the structural steels being studied, related to the formation of new phases and microarrays in the crystal lattice, have been studied by the X-ray diffraction method. According to the results of the performed work, it can be concluded that processing by impulse plasma flows leads to structural-phase changes and defect formation