Metallographic diagram of high chromium cast iron

High-Chrome Cast Iron Microstructure

High-chrome cast iron is an important form of cast iron used in many applications due to its high strength and wear resistance properties. The microstructure of high-chrome cast iron is composed of three main components: the matrix, carbides and contaminants.

The matrix is a combination of graphite, free elemental carbon and ferrite. The graphite is the primary structural component and provides both the strength and the ductility properties of the cast iron. The free elemental carbon is a non-structural (amorphous) component, which is relatively soft, providing a cushioning effect against abrasive wear. Finally, the ferrite is a non-structural, low carbon-content component, which gives greater toughness and resistance to impact loading of the cast iron.

Carbides are the second main component of high-chrome cast iron and provide the primary source of wear resistance. These are small particles dispersed throughout the matrix. They are composed of various combinations of elements, the most common being chrome, tungsten, molybdenum and vanadium, which give high levels of wear and corrosion resistance.

The last main component of high-chrome cast iron is the contaminants. These are commonly formed when the cast iron is heated, cooled or melted. Contaminants may include slag residue, oxides and other metallic contaminants, which can potentially reduce wear resistance and strength.

In summary, high-chrome cast iron is a form of cast iron that has a combination of strength, ductility, toughness, wear resistance and corrosion resistance. The microstructure of high-chrome cast iron consists of a matrix of graphite, free elemental carbon and ferrite, carbides of various elements and contaminants that were formed during the manufacturing process. All of these components combine together to create a strong and durable material suitable for many applications.

介绍

High Chromium Cast Iron Microscopy

High chromium cast iron is an important engineering material. It has high strength, good casting performance and excellent abrasion resistance. Its matrix is mainly composed of high chromium cast iron plus a small amount of graphite, corrosion resistance, with excellent wear resistance, corrosion resistance and thermal shock resistance.

The microstructure of high chrome cast iron mainly includes lath martensite and ledeburite, a few pearlite and graphite and other phenomena. When observing high chrome cast iron from the micro-level, it is necessary to select a suitable rupture surface and prepare for observation.

The high chromium cast iron microstructure can be observed and identified by optical microscope and electron microscope. Optical microscope mainly observes the size, shape and spatial distribution of carbides, matrix and graphite; Electron microscope mainly observe the performance of microstructure and the morphology, distribution and size of carbides and graphite.

In order to ensure the quality of high chromium cast iron components, it is absolutely necessary to carry out comprehensive inspection and analysis, including metallographic structure, chemical composition, mechanical properties and microstructure. Especially the analysis of metallographic microstructure is very important. According to the analysis of metallographic microstructure, the uniformly dispersed carbide, the selection of matrix structure and the selection of carbide type and morphology can meet the application requirements of high chrome cast iron.