Metallographic diagram of W18Cr4V (heating to 1300°C. Quenching oil)

Metallography of Heat treated HSS W18Cr4V

Metallography is the study of metal structures, grains and microstructures under a microscope. It provides insight into the quality and properties of metals, and it allows for quantitative measurements to be done on mechanical and chemical properties of metals. The alloy W18Cr4V is a high-speed steel (HSS) that is widely used in metalworking applications. It has high corrosion and wear resistance, as well as high heat resistance. In this study, we will be investigating the microstructure of this alloy after it has been heat treated at 1300℃ and quenched.

The sample used in the experiment was a disk of HSS W18Cr4V with a diameter of 10 mm and a thickness of 4 mm. The disk was polished and its surface was examined with light microscope. The grain size and shape were observed, as well as its distribution.

The microstructure of the alloy was determined by taking optical micrographs at different magnifications. Results showed that the W18Cr4V alloy grain structure was composed of martensite and ferrite grains, with martensite predominating the microstructure. The martensite grains were dense, uniform, and well distributed. There were some porosities and cracks in the martensite. The ferrite grains had a more diverse shape, with some grains even having odd shapes.

The grain size was determined by measuring the diameter of several grains in each microstructure. Results showed that the average grain size for the W18Cr4V alloy was about 4.5μm. The grains had a uniform distribution over the entire microstructure, although some portions had a smaller grain size.

The heat treated alloy W18Cr4V had a good combination of properties. It was found to have excellent wear resistance and corrosion resistance. Its hardness was measured to be 40 HRC, which is suitable for many applications. Its microstructure was composed of predominantly martensite, which is known to be tough and hard yet still able to withstand high temperatures.

Overall, metallography is an important tool for studying metal structures and properties. In this study the microstructure of the alloy W18Cr4V was investigated after heat treatment and quenching. Results showed that the alloy had a predominantly martensite structure, with uniform grain size and distribution. The heat treated alloy had good wear and corrosion resistance, as well as high heat resistance. This makes HSS W18Cr4V a suitable material for many metalworking applications.

Analysis Report on Structure of Steel W18Cr4V

Steel W18Cr4V is a kind of martensitic heat-resisting ferritic bearing steel with excellent performance. It is often used to make high-temperature components, such as aerospace, military and power plant components. In order to further analyze its structure, an optical microscope was used to detect the microstructure of Steel W18Cr4V(heat to 1300°C. quenching in oil).

The scanning electron microscope (SEM) was used to observe the microstructure of the sample. The bright field image under SEM showed that the grain was refined and most of the grains were about 4μm. There were a few spots on the surface, which belong to the normal microstructure of steel W18Cr4V. No insulating phase or foreign matter inclusions were observed.

In the metalloidal optical microscope observation, the abundant austenite grains were distributed precisely and evenly, accompanied by some lath martensite, needle ferrite and fine alloy carbides, which varied in size.The result of hardness testing was up to HRC58.2,which proved the good effect of quenching.

In conclusion, the microstructure of steel W18Cr4V meets the requirements of the standard. The grain size is uniform and fine, the hardness is good and there is no porosity or segregation in the structure. It is suitable for the production of demanding components.