，主要讲述35CrMo(氮碳共渗)金相图
The 35CrMo steel is a low alloy steel whose carbon content is low while its nitrogen and carbon content is high. This steel is widely used in many fields including automotive, building, aerospace, and more. The 35CrMo steel contains high levels of alloying elements such as chromium and molybdenum, which gives it excellent strength, toughness, and ductility.
A metallographic examination is used to study the alloy’s microscopic structure. A metallographic sample of the 35CrMo steel is prepared and then observed under a microscope, typically an optical microscope. This examination allows us to study the size and shape of grains, as well as defects such as voids, fractures, and inclusions. By looking at the individual micro-structural elements, we can gain a better understanding of the steel’s properties.
One of the main elements of studying the 35CrMo steel is the examination of the metal’s micrograph, or the metallurgical micrograph. This micrograph is essentially a photomicrograph of the alloy’s metal grains. It reveals a variety of information, such as grain size, grain orientation, morphology, secondary phases, and the presence of foreign particles, damage, or defects. The micrograph is typically captured using a light microscope and then studied and analyzed.
The micrograph gives us an excellent insight into the grain structure of the 35CrMo steel. The grain size and shape can be determined by examining the structure of the metal grain. The grain size typically increases with increasing heat treatments. Larger grains are usually associated with better strength, toughness, and ductility of the alloy. The grain orientation is important in determining the load-carrying capacity of the metal. Similarly, the presence of secondary phases in the metal, such as carbides, nitrides and borides can help to improve the properties of the alloy.
The presence of foreign particles, voids, and other defects are also detected by looking at the micrograph. These defects should be minimized as they could lead to loss of strength, toughness, and other unwanted properties of the 35CrMo steel.
The 35CrMo steel has excellent mechanical properties such as high strength, high hardness, good ductility and high wear resistance. It is also highly corrosion resistant and has a low coefficient of thermal expansion. With these qualities, it is suitable for many engineering applications such as for valves, piston rings, rod and shafts, fasteners, springs, and more.
In conclusion, the 35CrMo steel is a low alloy steel whose carbon and nitrogen content is high. Its high levels of alloying elements such as chromium and molybdenum give it excellent strength, toughness, and ductility. By studying the metals micrograph and looking at its grain size, grain orientation and the presence of secondary phases, defects, and foreign particles allows us to gain a better understanding of the steel’s properties and how it can be best used.
