Metallographic diagram of ZG20CrMo

High-alloy low-carbon steel is a kind of steel with breakable strength, relatively high plasticity, brittle fracture and high wear resistance. ZG20CrMo is a alloyed steel with 0.17~0.24% carbon, 0.25~0.35% silicon, 0.90~1.20% chromium and 0.15~0.30% molybdenum. It is widely used in various industries due to its excellent mechanical properties, good crucible properties and high hardness.

The metallographic structure of ZG20CrMo is the ferrite + pearlite structure, that is, the ferrite and pearlite are evenly distributed in the matrix. The ferrite area is relatively small, while the pearlite area is relatively large. The ferrite area is large in the middle and small in the surface and near the surface. The pearlite area is large in the surface and near the surface, and small in the middle.

The microstructure of ZG20CrMo consists of ferrite and pearlite. The ferrite is dispersed in the spheroidized cementite, and the pearlite is made of alternate layers of ferrite and cementite. Therefore, ZG20CrMo is a steel with higher hardness, wear resistance and good knee resistance, which is suitable for cold punching and cold forming.

The presence of martensite in the matrix would reveal the formation of martensite. The martensite can be identified and measured by the presence of black lines in the microstructure. There is no martensite present in the microstructure of ZG20CrMo, indicating that it only exists in austenite and is not present in the matrix.

The microstructure of ZG20CrMo shows a homogeneous distribution of ferrite and pearlite, indicating that the alloy steel has good overall performance, good strength and toughness and better properties than ordinary carbon structural steel. The hardness of the material is higher than that of conventional carbon steel.

The microstructure of ZG20CrMo is composed of ferrite, pearlite and bainite, which is beneficial to improve the strength of the material. The bainite grain can effectively improve the wear resistance and impact toughness of the material, and reduce the quenching sensitivity. The material is suitable for hot stamping and cold stamping.

In summary, the microstructure of ZG20CrMo is composed of ferrite, pearlite and bainite, which is beneficial to improve the strength and wear resistance of the material. It has excellent mechanical properties, good crucible properties and high hardness. The presence of black lines indicates the absence of martensite in the microstructure. The material is suitable for hot and cold stamping.

The metallographic structure of 20CrMo steel is martensitic structure. In the microstructure, it is a micro-alloy structure of chromium and manganese. The small chromium and manganese content of this steel enhances its corrosion resistance and wear resistance.

The morphological features of this steel include the presence of large precipitates or islands, result from the precipitation of alloy components; its boundaries are clear, indicating a well-defined microstructure; fine, equiaxed grains; and a branch-like morphology. The grain size of martensite can also vary with respect to its crystal structure.

The matrix structure of this steel is ferrite and pearlite. It exhibits a bainitic structure with small grains, uniform in shape and size. It also contains a large number of foreign elements such as Nb, Ti and V, forming large and evenly dispersed precipitates. The microstructure is characterized by anisotropic hardness, improving the cutting performance and wear resistance of the steel.

In summary, the metallographic structure of 20CrMo steel is martensite, ferrite and pearlite with a branch-like morphology and fine equiaxed grains. The presence of small amounts of foreign elements such as Nb, Ti and V form large, evenly dispersed precipitates, thus increasing its hardness and wear resistance.