Metallographic diagram of 35 steel (high-frequency quenching of rack teeth)

The pearlitic and martensitic structures of 35 steel (tooth part high frequency harden) were observed and discussed via metallorical microscope. The sample had been etched with 4% nital solution, with magnification of 256X. Overall, in the sample, most of the pearlite was observed, along with a small amount of martensite.

Pearlite is a combined and layered structure of alternating ferrite and cementite. The ferrite appeared as light patches while the cementite was dark. In the sample, pearlite was found to be commonly seen containing intrusions of eutectoid carbides, which were tetragonal in shape and sphercial in structure. Eutectoid carbides were found mainly along the interface of pearlite. They were uniform in size and showed a good degree of homogeneity.

In the sample, a small amount of martensite was observed as a black and splintered layer. This layer was seen between the pearlite and was composed of allotriomorphic and acicular ferrite as well as cementite needles. The martensite was formed of needle-like ferrite and cementite, making it harder and stronger than pearlite.

In addition, some isolated areas of steel were found to contain martensitic structure. These areas showed up as thin, thin and thin layers of martensite, with the layer being lighter and thinner than the surrounding pearlite. These layers were assumed to be a product of high frequency hardening and thermal treatment, which altered the initial microstructure of the sample.

Through the examination of 35 steel, it was found that the majority of the sample contained pearlite, with a small amount of martensite also present. It was postulated that the martensite had been formed as a result of high frequency hardening and thermal treatment, which had altered the initial microstructure of the sample. The martensite was found to be of a needle-like structure, increasing the strength and hardness of the sample overall. The study has provided an insight into the properties of 35 steel that have been altered by heat treatment and high-frequency hardening.

35 steel is a kind of steel used in the manufacturing of machine components, like cams, ratchets and other parts. It is a medium-carbon steel alloy with good hardenability. The steel can be heat-treated to high levels of strength and hardness, making it an excellent choice for many machine components.

The metallographic structure of 35 steel shows that it has a microstructure composed of tempered martensite and pearlite structures, both of which are responsible for its strength and hardness. The microstructure of 35 steel is a result of hardening after high frequency quenching, which takes place when the steel is heated to a certain temperature and then rapidly cooled. This process helps to increase the strength of the steel by making its components smaller, thus increasing strength and hardness.

The metallographic image of 35 steel also shows that the steel contains various sizes and shapes of carbides, with some of them having a more variable shape. Carbides are a type of hard, durable particles of varying shapes. They are created as a result of different chemical reactions and are used to provide maximum hardness, wear resistance and improved properties when combined with other metals.

The hardness of the 35 steel is determined by the presence of carbides in its microstructure. This is important as it contributes to the overall strength and durability of the steel. By heat-treating the steel and making the carbides present in the microstructure smaller and of a more uniform shape, the strength and hardness of the steel can be significantly improved, making it suitable for use in high precision and demanding applications.