It is shown from TEM analysis that the fine grained matrix materials are mainly derived from the huge clasts by subgrain rotation and local grainboundarymigration.
According to the results, the activation energy for migration of grainboundary Q was calculated. With the increase of the amount of re, the value of Q increases.
根据实验结果，对奥氏体晶界迁移激活能(Q)进行了计算，计算表明随稀土加入量增加，Q值亦增加。
3
The alloy phases are mostly distributed over the grainboundary in the form of compound phases, and they can hold back grainboundarymigration.