Cryogenic toughness in a low-cost austenitic steel

Yuhui Wang, Yubin Zhang, Andrew Godfrey*, Jianmei Kang, Yan Peng, Tiansheng Wang, Niels Hansen, Xiaoxu Huang*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

At low temperatures most metals show reduced ductility and impact toughness. Here, we report a compositionally lean, fine-grained Fe-30Mn-0.11C austenitic steel that breaks this rule, exhibiting an increase in strength, elongation and Charpy impact toughness with decreasing temperature. A Charpy impact energy of 453 J is achieved at liquid nitrogen temperatures, which is about four to five times that of conventional cryogenic austenitic steels. The high toughness is attributed to manganese and carbon austenite stabilizing elements, coupled with a reduction in grain size to the near-micrometer scale. Under these conditions dislocation slip and deformation twinning are the main deformation mechanisms, while embrittlement by α′- and ε-martensite transformations are inhibited. This reduces local stress and strain concentration, thereby retarding crack nucleation and prolonging work-hardening. The alloy is low-cost and can be processed by conventional production processes, making it suitable for low-temperature applications in industry.
Original languageEnglish
Article number44
JournalCommunications Materials
Volume2
Issue number1
Number of pages10
ISSN2662-4443
DOIs
Publication statusPublished - 2021

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