V00和V10熔敷金属冲击宏观断口由纤维区和剪切唇组成，V20熔敷金属冲击宏观断口主要由纤维区和剪切唇组成，但局部区域仍然出现了脆性断裂的特征。对宏观冲击断口的典型区域进行放大，发现V00和V10熔敷金属冲击断口基本都是韧窝，而V20熔敷金属冲击断口以韧窝为主，但是局部区域出现了准解理断裂特征，导致室温冲击韧性不如V00和V10熔敷金属。此外，对比V00和V10熔敷金属室温冲击宏观断口，可以看出，前者剪切唇面积更大，因此，V00熔敷金属的室温冲击韧性最好。熔敷金属–60℃冲击断口和室温冲击断口相比，脆性断裂区域面积明显增大，导致低温冲击韧性更差。冲击断口表面存在的球状颗粒是Mn-Si-O夹杂物。

The impact macroscopic fracture of V00 and V10 deposited metal was composed of fiber area and shear lip, and the impact macro fracture of V20 deposited metal was mainly composed of fiber area and shear lip, but the characteristic of brittle fracture still appeared in some areas. The typical area of the macroscopic impact fracture was enlarged, and it was found that the impact fractures of V00 and V10 deposited metals were basically dimples, while the impact fractures of V20 deposited metals were mainly dimples, but there were quasi-cleavage fracture characteristics in local areas, resulting in The impact toughness at room temperature was not as good as V00 and V10 deposited metals. In addition, comparing V00 and V10 deposited metal at room temperature impact macroscopic fracture, it can be seen that the former had a larger shear lip area. Therefore, V00 deposited metal had the best room temperature impact toughness. Compared with the impact fracture at room temperature, the area of the brittle fracture area of the deposited metal was significantly larger than the impact fracture at 60℃, resulting in worse low-temperature impact toughness. The spherical particles on the surface of impact fracture were Mn-Si-O inclusions.