图4. 铸态GH4975合金在1160 ℃进行30%变形量热压缩后内部裂纹的OM像和EBSD像
Fig.4. OM image of cracks (a) and EBSD image of intergranular cracks (b) in as-cast GH4975 samples after hot deformation (1160 ℃, 30%, 0.1 s-1)