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How to improve the hardness of light burnt magnesia ball manufacturers

2020-11-20 09:49:09
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The strength and hardness are improved by heat treatment. The effects of various heat treatments are provided below. For light-burned magnesium balls, you can choose the appropriate heat treatment according to the situation. If you just want to increase the hardness, surface quenching is recommended. The purpose of normalizing ductile iron is to obtain the pearlite matrix structure, and to refine the grains and uniform structure to improve the mechanical properties of the casting. Sometimes normalizing is also the preparation for surface quenching of ductile iron. Normalizing is divided into high temperature normalizing and low temperature normalizing. The high-temperature normalizing temperature generally does not exceed 950-980℃, and the low-temperature normalizing is generally heated to a common bending temperature range of 820-860℃. After normalizing, four people are required to deal with it to eliminate the internal stress generated during normalizing.


In order to improve the mechanical properties of ductile iron, castings are generally heated to 30-50°C above Afc1 (Afc1 represents the final temperature of A formation during heating), and then quenched into oil after heat preservation to obtain a martensite structure. In order to appropriately reduce the residual stress after quenching, tempering should generally be carried out after quenching. The low-temperature tempering structure is tempered martensite with residual bainite and nodular graphite. This structure has good wear resistance and is used for parts requiring high wear resistance and high strength.


The tempering temperature of the medium temperature is 350-500℃. The structure after tempering is tempered troostite and spherical graphite, which is suitable for thick parts that require good wear resistance, stability and elasticity. High temperature The tempering temperature is 500-60D℃, the structure after tempering is tempered Soxhlet made of spheroidal graphite, which has the comprehensive properties of good combination of toughness and strength, so it is widely used in production.


In order to improve the mechanical properties of ductile iron, castings are generally heated to 30-50°C above Afc1 (Afc1 represents the final temperature of A formation during heating), and then quenched into oil after heat preservation to obtain a martensite structure. In order to appropriately reduce the residual stress after quenching, tempering should generally be carried out after quenching. The low-temperature tempering structure is tempered martensite with residual bainite and nodular graphite. This structure has good wear resistance and is used for parts requiring high wear resistance and high strength. The tempering temperature of medium temperature is 350-500℃. After tempering, the structure is tempered troostite plus spherical graphite, which is suitable for thick parts that require good wear resistance, stability and elasticity. High temperature The tempering temperature is 500-60D℃, the structure after tempering is tempered Soxhlet made of spheroidal graphite, which has the comprehensive properties of good combination of toughness and strength, so it is widely used in production.

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