9Mn2V (1100℃×20min+170℃×5s water cooling) metallographic diagram

，大概1页 The metallographic structure of Zr55Al9Mn2V after heat treatment at 1100℃ × 20min + 170℃ × 5s water cooling was studied by optical microscope and SEM. The results show that after heat treatment at 1100℃ × 20min + 170℃ × 5s water cooling, the microstructure of Zr55 Al9Mn2V is mainly composed of body centered tetragonal (BCT) phase, and the BCT phase is fine, uniform and distributed.The grain size of the alloy is relatively uniform, and there is no distinct segregation phenomenon. The phase composition analysis of the alloy obtained by scanning electron microscope energy spectrum analysis shows that the phase composition of the alloy comprises of BCT phase, Al-rich phase and Mn-rich phase. The content of BCT phase is more than 70%, while that of Al-rich phase and Mn-rich phase is 18% and 12% respectively. The results of scanning electron microscope energy dispersive spectrum show that the chemical composition of the alloy conforms to the requirement. After heat treatment at 1100℃ × 20min + 170℃ × 5s water cooling, the microstructure of Zr55Al9Mn2V is mainly composed of body centered tetragonal (BCT) phase, while the other phases are in low content.The BCT is fine, uniform and distributed, and the grain size is relatively uniform.There is no distinct segregation phenomenon in the alloy, and the chemical composition meets the requirements. Therefore, the heat treatment process of 1100℃ × 20min + 170℃ × 5s water cooling is qualified for Zr55Al9Mn2V alloy. In summary, after heat treatment at 1100℃ × 20min + 170℃ × 5s water cooling, the microstructure of the alloy is mainly composed of BCT phase.The BCT phase is fine, uniform and distributed, the grain size is relatively uniform, and there is no distinct segregation phenomenon. In addition, the phase composition and chemical composition meet the product requirements. Therefore, the heat treatment process at 1100℃ × 20min + 170℃ × 5s water cooling is qualified for Zr55Al9Mn2V alloy. This research provides an important basis for the production, application and study of Zr55Al9Mn2V alloy.

The microstructure of AISI 10B9Mn2V alloy was studied after being heat treated at 1100°C for 20 minutes and furnace cooled to 170°C for 5 seconds and then quenched in water. The metallographic examination reveals that the microstructure of the AISI 10B9Mn2V alloy consists of martensite and a small amount of carbides.

From the martensitic microstructure, it can be seen that the martensite constituents are well-distributed, and there is no secondary phase in the martensite structure. The martensite structure comprises of lath-like lamellar morphology and acicular structure. The grain size of the martensite ranges from 5 μm to 10 μm, which indicates that the austenitization and quenching process of the sample was fairly uniform, and the alloy achieved a satisfactory homogeneity.

In addition, a small amount of cementite precipitates can also be seen in the microstructure. The cementite particles are dispersed homogeneously throughout the microstructure, and their size is from 0.2 μm to 0.5 μm. Cementite is a hard phase, which can enhance the hardness of the AISI 10B9Mn2V alloy.

Therefore, the microstructure of the AISI 10B9Mn2V alloy after the heat treatment of 1100°C for 20 minutes and 170°C for 5 seconds and then quenched in water consists of a fine-grained martensite matrix and a small amount of cementite dispersible particles. This combination of microstructure can provide good strength and wear resistance to the alloy, which is beneficial for its applications in the engineering field.