The relationship between the mechanical stability of retained austenite(gamma') and the cryogenic toughness of Ni9 steel has been investigated and the phenomena of gamma' --> martensite(alpha') transformation in the process of impact deformation-fracture have been observed. The results show that the role of gamma'-phase itself is beneficial to cryogenic toughness but rather small, the main reason of good cryogenic toughness in large margin is perhaps gamma' --> alpha' transformation performed in process of the impact-fracture.
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