Metallographic diagram of 25MnTiB (tempered at 380°C)

Introduction

25MnTiB is a multi-component alloy mainly composed of manganese and titanium boride. It has a high hardness and good wear resistance, making it suitable for applications where strength and durability are required. In this study, we investigate the microstructure of 25MnTiB after being subjected to tempering at 380℃.

Experimental

The 25MnTiB samples were machined using a CNC lathe and a drill press. The surfaces were cleaned and then heated to 380℃ for 8 hours in a muffle furnace as a tempering treatment. The samples were then allowed to cool in air to room temperature.

Characterization

After the tempering treatment, the samples were examined for microstructure changes by optical and scanning electron microscopy (SEM). The optical microscope was used to observe the overall microstructure, while the SEM was used to examine the finer details. Energy-dispersive X-ray spectroscopy (EDS) was used to analyze the chemical composition of the samples.

Results and Discussion

The optical microscopy results showed that the 25MnTiB samples had a finely grained microstructure with no obvious defects or inclusions present. The SEM images revealed a uniform and well-defined grain structure. The grain size was approximately 5μm.

The EDS results showed that the 25MnTiB samples contained manganese, titanium, and boron in the expected proportions. The chemical composition was found to be within the recommended ranges for the alloy.

Conclusion

The 25MnTiB samples were found to have a uniform and well-defined microstructure after being subjected to tempering at 380℃. The chemical composition was found to be within the recommended ranges for the alloy. The results show that 25MnTiB is suitable for applications requiring high strength and durability.

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HKS25MnTiB is a type of martensite steel material, which typically consists of 0.25% of Carbon, 1.0% of Manganese, 0.4% of Silicon, 0.2% of Chromium, 0.15% of Molybdenum and 0.6% of Titanium, as well as minor amounts of Iron and other elements. It has a relatively high hardness and tensile strength, because of its high carbon content and the presence of other alloying elements, and it is particularly useful in applications that require wear- and fatigue-resistance. Heat treatment of HKS25MnTiB is the key to its properties. It is typically annealed at 850℃ and then tempered at 380℃. The microstructure of the martensite steel after tempering at 380℃ consists of grains of ferrite and carbide, as well as small plates of martensite. The carbide plates are distributed evenly and are easily visible when the steel is observed under the microscope. In addition, the ferrite grains show some variation in size, which is typical for martensite steel. The hardness of the steel after tempering at 380℃ is typically between 4010 and 4110 HV. The microstructure of this type of steel is stable and highly wear-resistant, thus making it well-suited for use in applications such as cutting knives, tooling, drill bits and other components.