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The effects of the eutectic carbides rand secondary carbides on creep deformation and rupture in smooth bars and CT specimens have been studied. The results show that the resistance of the eutectic carbides of skeleton shape to crack growth is larger than that of the blocky shape carbides. The dendritic segregation of secondary carbides promotes the creep ductility. As the secondary carbide particles become coarser, the creep ductility increases and the crack growth rate decreases. However, if the size of secondary carbide is too large, the creep strength decreases too much and therefore crack growth rate increases.

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