Metallographic diagram of rod-like bainite GCr2

GCr2 is an alloy of iron and carbon, containing more than 2.1% C and up to 1.75% Cr. The alloy is also known as high carbon high chromium steel, with a high wear resistance and improved fatigue strength over conventional high-carbon steels.

The grain structure of GCr2 can be seen in a metallurgical microscope. GCr2 is a pearlitic steel and has a structure consisting of ferrite bands and pearlite bands. These pearlite bands contain layers of ferrite and cementite and can be observed in detail with a metallurgical microscope.

The ferrite grains in GCr2 are elongated, thin and diamond shaped in cross-section and the pearlite bands are elongated and rod-like, about 40-50% of maximum width. GCr2 exhibits a rod-like grain structure, with ferrite and pearlite alternating on either side. This rod-like grain structure provides the alloy with enhanced strength and hardness, along with excellent wear resistance.

The rod-like grain structure also helps to hold onto chip material as it breaks away, as well as maintain dimensional stability while machining. GCr2 alloy offers excellent toughness, ductility and fatigue strength. These characteristics make GCr2 ideally suited for applications where high wear resistance and strength is required.

GCr2 alloy is used in a wide range of applications, including but not limited to, valves, machine tools, springs, shafts, and wearable parts. The addition of chromium to the alloy helps reduce wear and tear, and increases its resistance to abrasion. Wear properties of GCr2 are some of the best and it is recommended for heavy duty applications.

In conclusion, GCr2 alloy is a high wear resistance and hardness steel with excellent ductility, toughness and fatigue strength. Its rod-like grain structure helps to improve its performance under high stress and wear applications. GCr2 alloy is used in a variety of industries and applications and is highly recommended for its wear resistance, toughness and fatigue strength.

GCr2 is a kind of bar-shaped bainite with low carbon content, medium carbon bainite and high carbon bainite. GCr2 is widely used in the production of spindle taper bearings, valve forging, stator forging and other parts in aviation, ships and locomotives.

GCr2 microstructure mainly contains different forms and amounts of carbide and Retained Austenite (RA). The metallographic pictures of the GCr2 mainly include elliptical, oval, circular and other forms of carbide, the retained austenite forms are mainly acicular, sheath and granular.

When larger amount formed in the matrix and distributed more evenly, the GCr2 microstructure is classified as a fine pearlite group. When the amount of carbides increases and it is concentrated in the grains, it is classified as a white band group. If the acicular form of retained austenite is interposed between the plates of pearlite and the proportion is increased, the microstructure is classified as a acicular ferrite group.

When the fine acicular ferrite is distributed more evenly and the carbide is distributed more sparsely, the microstructure falls into the martensite group. As the carbide increases, the martensite transforms into a auburn, and the carbide transforms into a chunky form, which is classified as the bainite group.

Finally, when the carbide is closely aggregated, the microstructure is mostly classified into the cementite group. Through the above introduction, it can be clearly known that the microstructure of GCr2 bar bainite is a combination of various elements. Therefore, it has wide application prospects in production.