Through heat treatment to improve strength and hardness, the following provides the effect of various heat treatment, light burning magnesium ball, you can choose the appropriate heat treatment according to the situation. If only to improve the hardness, surface hardening is recommended. The purpose of normalizing ductile iron is to obtain pearlite matrix structure, refine grain size and uniform structure, so as to improve the mechanical properties of castings. Sometimes, normalizing is also the preparation for the structure of ductile iron surface quenching. Normalizing can be divided into high temperature normalizing and low temperature normalizing. The normalizing temperature of high temperature is generally no more than 950 ~ 980 ℃, and the normalizing temperature of low temperature is generally 820 ~ 860 ℃. After normalizing, four people are needed to remove the internal stress.
In order to improve the mechanical properties of nodular cast iron, the casting is generally heated to 30-50 ℃ above Afc1 (Afc1 represents the end temperature of a formation during heating), and then quenched into oil after heat preservation to obtain martensite structure. In order to reduce the residual stress after quenching properly, tempering should be carried out after quenching. The microstructure of low temperature tempering is tempered martensite plus residual bainite plus spherical graphite. This kind of structure has good wear resistance and is used for parts requiring high wear resistance and high strength.
Manufacturers of light burned magnesium balls
The medium temperature tempering temperature is 350-500 ℃. After tempering, the microstructure is tempered troostite plus spherical graphite, which is suitable for thick parts with good wear resistance, effective stability and elasticity. High temperature tempering temperature is 500-60d ℃. After tempering, the structure is tempered sorbite plus spherical graphite. It has good comprehensive properties of toughness and strength, so it is widely used in production.
In order to improve the mechanical properties of nodular cast iron, the casting is generally heated to 30-50 ℃ above Afc1 (Afc1 represents the end temperature of a formation during heating), and then quenched into oil after heat preservation to obtain martensite structure. In order to reduce the residual stress after quenching properly, tempering should be carried out after quenching. The microstructure of low temperature tempering is tempered martensite plus residual bainite plus spherical graphite. This kind of structure has good wear resistance and is used for parts requiring high wear resistance and high strength. The medium temperature tempering temperature is 350-500 ℃. After tempering, the microstructure is tempered troostite plus spherical graphite, which is suitable for thick parts with good wear resistance, effective stability and elasticity. High temperature tempering temperature is 500-60d ℃. After tempering, the structure is tempered sorbite plus spherical graphite. It has good comprehensive properties of toughness and strength, so it is widely used in production.