珠光体可锻铸铁球化退火工艺研究

A Study on Annealing Process to Granulate the Pearlite of Malleable lron

采用金相法研究了由片状珠光体可锻铸铁转变为粒状珠光体基体的球化退火工艺。结果表明，片状珠光体可锻铸铁在共析点 AC1以下 (680℃ )保温 210min球化退火和在共析点 AC1以上 (820℃ )进行 12min短时球化退火后空冷都可获得粒状珠光体可锻铸铁。

A granulation annealing process to change the flake pearlite of malleable iron into granular pearlite was studied with metallography method.The result showed that malleable iron with tranular pearlite could be obtained with both two granulation annealing proceses:heating the flake pearlite malleable iron to a temperature lower than eutectold point Ac1(680℃ ),holding for 210min;or heating to a temperature higher than eutectoid point Ac1(820℃ )holding for a short time of 12 min,and then air cooling.