Introduction to austenite grain size
The actual grain size refers to the size of the austenite grains actually obtained in the steel under a specific heating condition. The actual grain size is different from the initial grain size. The initial grain size is the grain size when the austenite is just formed (that is, the grain boundary just touches), while the actual grain size refers to the austenite After a certain period of heat preservation. Therefore, the actual grain diameter is larger than the initial grain diameter.