Today, I will take you to continue to understand
the metallographic adverse reactions of ductile iron
three, grass graphite: mainly because the low melting point alloy
in the final solidification site segregation.
Therefore, by increasing the number of graphite,
making graphite spheres evenly distributed,
shortening the distance between spheroidal ink,
so as to reduce the segregation tendency.
four, graphite ball is not round: mainly because of gestation recession,
high temperature, long holding time,
the original molten iron white mouth tendency.
Therefore, this problem can be improved by late inoculation.
The amount of residual Mg can be adjusted appropriately,
and the holding temperature and holding time can be controlled.
helpful to improve this problem.
the metallographic adverse reactions of ductile iron
three, grass graphite: mainly because the low melting point alloy
in the final solidification site segregation.
Therefore, by increasing the number of graphite,
making graphite spheres evenly distributed,
shortening the distance between spheroidal ink,
so as to reduce the segregation tendency.
four, graphite ball is not round: mainly because of gestation recession,
high temperature, long holding time,
the original molten iron white mouth tendency.
Therefore, this problem can be improved by late inoculation.
The amount of residual Mg can be adjusted appropriately,
and the holding temperature and holding time can be controlled.
five, graphite floating: CE value is too high, casting temperature is too high.
Therefore, proper adjustment of CE value,
pouring temperature and increase of incubation amount arehelpful to improve this problem.
