Morphology and X-ray energy spectrum of FeO·Cr2O3 spinel inclusions in GCr15 steel

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GCr15 Steel is a low-carbon, high-chromium martensitic alloy steel made by adding 1% chromium to ordinary ordinary steel, which increases its corrosion resistance and abrasion resistance. The high chromium content and heat treatment process of GCr15 improves its hardness and increases wear resistance, making it significantly superior to ordinary steel. The chemical composition of GCr15 steel mainly includes iron, carbon, chromium, manganese, silicon, phosphorus and molybdenum.

Due to the addition of chromium, the formation of Cr2O3 on the surface of GCr15 steel can drastically improve its performance. The Cr2O3 which mainly contains FeO and chromium can act as abrasive, improve the wear and anti-corrosion ability of GCr15 steel. The addition of chromium in GCr15 was accompanied by the presence of carbides and other impurities, which led to the formation of FeO·Cr2O3 compound spinels in the steel. These spinels contain iron and chromium, so their shape and structure can significantly affect the wear resistance of GCr15 steel.

The study of the morphology of the FeO·Cr2O3 compound spinels in GCr15 steel is of great significance to study the corrosion, wear and fatigue resistance of GCr15 steel. In this study, an X ray diffraction, X-ray photoelectron spectroscopy and a scanning electron microscope studies were conducted to study the shape and structure of the spinels.

The results of the X ray diffraction showed that the FeO·Cr2O3 compound spinel grains in the GCr15 steel are mainly composed of Fe and Cr, with a small amount of C, Mg and Si. The grain size is approximately 0.050-0.125 nanometer. The X-ray photoelectron spectroscopy showed that the chemical states of the Fe and Cr elements in the spinel are mainly divided into two layers - an external low oxidation state (Fe2+ superficial layer and Cr3+ superficial layer) and an internal high oxidation state (Fe3+ core layer and Cr2+ core layer).

The surface morphology of the FeO·Cr2O3 compound spinels observed under a scanning electron microscope shows that they have a surface texture consisting of a large number of bumps. These bumps are usually formed by particles containing the dimensions of a few nanometers and have a height varying from 0.2 to 0.3 nanometers.

In summary, the surface morphology and composition of the FeO·Cr2O3 compound spinels in GCr15 steel were studied by X ray diffraction, X-ray photoelectron spectroscopy and scanning electron microscopy. The results suggest that the compound spinels are made up of two chemical layers with the external low oxidation state and the internal high oxidation state. The surface of the spinel grains is characterized by an uneven distribution with the bumps of a few nanometers in height. This study provides a deeper understanding of the shape and structure of FeO·Cr2O3 in GCr15 steel, which may be useful in future research on the properties of GCr15 steel and other alloy steels.

FeO-Cr2O3 inGCr15 steel alloy tends to form intermetallic compound containing iron and chromium, often referred to as spinels. In the structure, Fe ions occupy the octahedral sites and Cr3+ ions occupy the tetrahedral sites. The morphology and chemical composition of these spinels can be explored using X-ray diffraction (XRD) and X-ray energy spectroscopy (XES).

XRD of spinels in GCr15 steel alloy reveals that they primarily exist as cubes and octahedra. The size of these particles range from a few nanometers to several micrometers. The X-ray diffraction pattern of these spinels is a compound containing only Fe, Cr, and O. X-ray energy spectroscopy (XES) shows that the spinels are composed of a number of different chemical species such as Fe, Cr, and O, as well as several transition elements, such as Ti and Mn. The relative abundance of these elements varies with temperature and the time of exposure.

The spinels in GCr15 steel alloy have an important influence on many physical and mechanical properties. For example, the strength of the steel alloy is directly related to the size and distribution of the spinels. The oxide content of the spinels also affects the corrosion behavior of the alloy. Thus, understanding the morphology and composition of the spinels is important for controlling and optimizing the properties of GCr15 steel alloy.