25Si2Mn2MoV (930℃×40min+300℃×5s water cooling) metallographic diagram

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25Si2Mn2MoV is a ferritic material, which is a common alloy used in the manufacturing of high pressure, heat-resistance and heat-stressed components. 25Si2Mn2MoV has good machinability and excellent weldability, as well as high mechanical strength, good corrosion resistance, and excellent wear resistance. Due to its unique characteristics and advantages, it is widely used in the petrochemical, power station, pressure vessels, mining and other industries.

In order to study the effect of heat treatment process on the microstructure and properties of 25Si2Mn2MoV, a heat treatment of 930℃×40min+300℃×5swatercooling is adopted. After heat treatment, the microstructure and properties of 25Si2Mn2MoV are investigated by optical microscopic observation, hardness tester and impact test machine. The microstructure of 25Si2Mn2MoV is observed by means of optical microscope and the microstructure characteristics are analyzed. The microstructure observation results show that the matrix of 25Si2Mn2MoV consists of a large number of ferrite, pearlite and a small amount of carbide. The presence of ferrite and pearlite in the matrix indicates that the heat treatment has been successful, and the microstructure is relatively uniform.

The hardness and impact properties of 25Si2Mn2MoV were also studied by using a hardness tester and an impact test machine respectively. The results show that the 25Si2Mn2MoV has an average Rockwell hardness of HB176 and an average impact energy of 27 J/cm2. These results demonstrate that the heat treatment can effectively improve the mechanical properties of 25Si2Mn2MoV, making it suitable for a variety of high-load applications.

Finally, the microstructure of the 25Si2Mn2MoV is studied using the metallographic technique. After polishing and etching, a clear microstructure of ferrite, pearlite and carbide particles is observed. The microstructure is also uniform and well coupled, which further confirms the effectiveness of the heat treatment process.

In summary, the results of this study have shown that the heat treatment process of 930℃×40min+300℃×5swatercooling can effectively improve the properties of the 25Si2Mn2MoV material. The microstructure of the material is uniform, and the mechanical properties of the material are improved after the heat treatment. Therefore, the 25Si2Mn2MoV material is suitable for a variety of applications requiring high-load and/or high-temperature operation.

The microstructure of 25Si2Mn2MoV steel after quenching and tempering process is observed under optical microscope. The metallographic cross-section sample is grinded and polished under 630#, 1000# and 1500# of polishing grind films. The microstructure in the cross-section was observed at 400 times magnification.

As can be seen in the microstructure, the matrix is composed of Ms, Mf, and the secondary particles are composed of tempered sorbite, tempered martensite and a small amount of undissolved carbide. The Ms and Mf of the matrix have been completely transformed with different sizes due to the solution treatment at 930℃ and tempering at 300℃, showing a uniform and dense grain. Besides, the average grain size is about about 9.5μm. The tempered martensite and temper sorbite are discretely distributed in the matrix, and the lamellar cementite is dissolved in the matrix. The size of them are relatively fine, usually between 1 and 3 μm, which plays an important role in improving strength and wear resistance of the steel. Therefore, it can be concluded that this quenching and tempering process has effectively improved the microstructure and optimized the mechanical properties of 25Si2Mn2MoV steel.