Metallographic diagram of 35CrMo (quenched at 850°C)

Metallographic Trends in 35CrMo at 850℃ Quenching

35CrMo is a type of molybdenum-containing steel that is often used in engineering and construction projects. The unique properties of this metal offer numerous advantages in construction. Quenching is a method of rapidly cooling metal to retain certain desired characteristics, and this steel undergoes quenching at elevated temperatures when it is used in certain engineering applications. Quenching at 850℃ has distinct effects on the microscopic constituents of this steel and the following is an overview of the trends observed in 35CrMo when it is quenched at this temperature.

The first trend observed in 35CrMo after quenching at 850℃ is the increased hardness in the metal, which is a desirable characteristic in this application. This increased hardness, however, is largely a result of the increase in martensite, which is an incredibly hard part of the metal. As a result, this alloys metal becomes much harder and more resistant to wear.

Another important trend observed in 35CrMo after quenching at 850℃ is in the size and homogeneity of the grain structure. The grains can be observed as small and uniform rectangles in the metal and this homogeneity is due to the increased amount of martensite in the steel, which serves to compress the grain boundaries of the metal. This increased grain structure offers improved strength and structural integrity in the metal; making it an ideal choice for engineering projects.

Finally, the last trend observed in 35CrMo at 850℃ quenching is the improved corrosion resistance that this metal exhibits. Quenching increases the presence of chromium within the metal, which offers better protection from corrosive agents. This improved corrosion resistance further adds to the advantages of using this material in engineering applications, such as in bridges, ships, and many others.

Overall, 35CrMo is a superior choice for engineering projects due to its unique properties. Quenching at 850℃ has distinct effects on this metal, which can be seen through increased hardness, improved grain structure, and increased corrosion resistance. All of these traits show that 35CrMo is a perfect choice for many engineering projects; providing superior features and loads of advantages over other metals.

Structural steel 35CrMo is a medium alloyed steel that has high strength and is mainly used for manufacturing items that need high fracture toughness and requires a certain degree of creep strength.

35CrMo has excellent heat-treatment properties. It can be quenched and tempered. Its quenching range is relatively large and the hardness produced can reach about HRC 22-25. The manufacturing of components using this steel must undergo heat-treatment like hardened and tempered to different values degrees.

The microstructure of 35CrMo after undergoing quench and temper treatment at 850℃ has been observed by a scanning electron microscope. The result indicates that the microstructure primarily consists of pearlite and ferrite. After heat-treatment, the ferrite and carbides remain turned into the network form where the ferrite is mainly distributed within the matrix of the graphite laths, which accounts for 66.3% of the total structure. The strength of the material is determined by the combination of ferrite and pearlite, the volume fraction of which are respectively 22% and 5.7%. With the effects of the uniform distribution and balance of these two main structural elements, the strength of the material is improved greatly.

In conclusion, 35CrMo structural steel has excellent heat-treatment properties and after undergoing quench and temper treatment at 850℃, its primary microstructure is composed of pearlite and ferrite with a strength determined by the uniform and balance combination of them.