To obtain fine perlite ( on high carbon wires), the wire should heat uniformily up to fully transformation temperature where it is fully austenized (+,-) 800 oC then sudenlly in few seconds the material should decrease temperature ( +,-)500oc. . The conditions for different carbon contents can be obtain in the TTT curves ( Temperatur, Time ,Transformatio). WAI has several presentations on the subject can be seen on his web page
The administrator has disabled public write access.