Исследование дисперсионного твердения сплава на основе железа

Abstract

Целью данной работы является разработка нового дисперсионно-твердеющего сплава на основе железа. Исследования микроструктуры исследуемого сплава на основе железа подтвердили наличие дисперсных частиц. Наибольшее их скопление наблюдается по границам субзерен и зерен. В теле зерна наличие дисперсных частиц сводится к минимуму. Сувеличением количества дисперсных частиц существенно меняется соотношение содержания железа и хрома, что связано с выделением карбидов хрома в процессе старения стали. Содержание химических элементов в исследуемой стали значительно изменяется в зависимости от их расположения. В теле зерна преобладает железная матрица и содержание таких легирующих элементов, как марганец и никель.

The process of decomposition of supersaturated solid solutions and the allocation of excess phases occupy a special place among other phase transformations, as these processes occur during the final operations of heat treatment, forming the special properties of alloys. The aim of this work is to develop a new dispersion-hardened alloy based on iron. Material for study is the new dispersion-hardened alloy based on iron, which melting was carried out in a vacuum induction furnace. As received steel, the maximum hardening is observed after aging at 800 °C. Study of the microstructure confirmed the presence of dispersed particles. Their greatest accumulation observed in the boundaries of subgrains and grains, which is associated with a high degree of defectiveness of the crystal structure of these areas of the alloy. In the body of the grain the presence of the dispersed particles is minimized. The elemental composition of high-alloy austenitic heat resisting steels determined by energy dispersive registration line intensities of characteristic x-rays of the specimen, resulting from the irradiation of the microvolume of the sample in electron probe Spectragamescasino th at with the increase in the number of dispersed particles changes substantially the ratio of th e content of iron and chromium, which is associated with the precipitation of chromium carbides during the aging process began. The content of chemical elements in the investigated steels varies considerably depending on their location. This is due to the accumulation of alloying elements and their chemical compounds in the dispersion particles. In the body of the grain is substantially dominated by the iron matrix and th e content of such alloying elements as manganese and nickel.