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