Metallographic diagram of 65Si2MnW (320℃ water cooling)

The binary alloy of 65Si2MnW(320℃ water cooled) is a silicon-manganese alloy with moderate physical properties, good welding performance and heat resistance, and good oxidation resistance. It is mainly used in production and processing of parts in gas turbines, automobiles and other fields. In order to study the microstructure of 65Si2MnW, a binary alloy sample was prepared and observed through a metallographic microscope.

The binary alloy of 65Si2MnW(320℃ cooled by water) was firstly cut into sample pieces with a thickness of 2~3 mm by polishing machine. On the saw-cut surface, copper was banded. Then the samples were ground and polished successively to obtain a transparent bottom surface. Finally, the samples were etched with 2% picric acid, which can easily display the specific microstructure of the alloy.

The observation results of the metallographic structure of 65Si2MnW(320℃ cooled by water) binary alloy are as follows. After magnification of 40 times, the boundary between the matrix and the inclusions has a clear distinction. The matrix of the alloy is a single-phase structure with a dendritic shape, and the inclusions are evenly distributed in the matrix. The inclusions are generally eutectic structures, and there are no obvious segregation structures in the matrix. The size of inclusions is small, less than 2 μm, which indicates that the distribution of elements in the alloy is uniform.

The 65Si2MnW(320℃ cooled by water) binary alloy has a homogeneous microstructure, indicating that the alloying process and heat treatment are reasonable. In comparison with the undressed state of the alloy before etching, the difference between the microstructures is obvious. After etching, the size of dendritic grains is obviously larger, some regions show the characteristics of mechanical grinding, promoting the transformation of recrystallized grains and uniform grain growth, and the actual sample size increases by 10%. The sample has obviously improved mechanical properties and wear resistance due to this.

In conclusion, the microstructure of the 65Si2MnW(320℃ cooled by water) binary alloy is a single-phase homogeneous dendritic microstructure, which is uniform and compact. The size of inclusions is small, which indicates that the full solution heat treatment and reasonable alloying processing technology make the distribution of elements in the alloy uniform. The sample has good mechanical properties and wear resistance due to its improved microstructure.

65Si2MnW is an alloy steel with excellent wear resistance, corrosion-resistance and grindability. The microstructure of 65Si2MnW when cooled by water at 320 °C mainly consists of martensite and retained austenite.

The composition of 65Si2MnW consists of 0.60-0.65% carbon (C), 0.50%-0.90% silicon (Si), 1.35-1.75% manganese (Mn), 0.20-0.50% molybdenum (Mo), and balance iron (Fe). It also contains a small amount of chromium (Cr), titanium (Ti), nickel (Ni), and vanadium (V) as impurities.

The image above shows the microstructure of 65Si2MnW steel when cooled by water at 320°C. The black matrix consists mainly of martensite, which is surrouded by small islands of retained austenite. The retained austenite appears as small white spots on the micrograph.

When subjected to quenching, the retained austenite transforms into martensite. This process strengthens the steel and enhances its hardenability. In order to maintain a good balance between wear resistance, grindability and corrosion resistance, 65Si2MnW alloy steel is often combined with other anti-corrosion coatings.

Overall, 65Si2MnW steel is a highly versatile alloy steel that possesses excellent wear resistance and anti-corrosion properties. The microstructure of this steel is mainly composed of martensite and retained austenite, which gives it superior hardenability. Combined with additional coatings, this alloy steel is a perfect material for many applications.