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On the stability of retained austenite and its role in improvement of the cryogenic toughness for Ni9 steel
Author(s) -
Zhang Futian,
Hu Man,
Lou Zhifei
Publication year - 1993
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199301005
Subject(s) - austenite , toughness , metallurgy , materials science , forensic engineering , engineering , mechanical engineering , composite material , microstructure
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.