2021
DOI: 10.1038/s43246-021-00149-8
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Cryogenic toughness in a low-cost austenitic steel

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… Show more

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Cited by 35 publications
(32 citation statements)
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“…The slightly higher C content in the Fe-30Mn-0.11C steel may therefore ensure more sustained work hardening, avoiding at the same time the development of stress concentrations. An important consequence of this is that higher internal stresses, with values exceeding the onset stress for deformation twinning, can be reached in the Fe-30Mn-0.11C steel before fracture [14,37]. It can be noted here that such mechanical twinning can further enhance the work hardening ability, through the so-called dynamic Hall-Petch effect, which in turn increases the material ductility.…”
Section: Discussionmentioning
confidence: 97%
“…The slightly higher C content in the Fe-30Mn-0.11C steel may therefore ensure more sustained work hardening, avoiding at the same time the development of stress concentrations. An important consequence of this is that higher internal stresses, with values exceeding the onset stress for deformation twinning, can be reached in the Fe-30Mn-0.11C steel before fracture [14,37]. It can be noted here that such mechanical twinning can further enhance the work hardening ability, through the so-called dynamic Hall-Petch effect, which in turn increases the material ductility.…”
Section: Discussionmentioning
confidence: 97%
“…The carbide particles stimulate more nuclei and hinder the growth of grains [26,36]. Consequently, the recrystallization level and grain size of the experimental steel after cold rolling to 95% reduction followed by annealing were much smaller than those of other high-manganese steels without particles annealed at similar temperatures [42,43].…”
Section: Carbides Precipitationmentioning
confidence: 91%
“…Subsequently, the samples were waterquenched. The Fe-30Mn-0.11C steel has a stable austenitic structure after 90% cold rolling, which was characterized in our previous work [17][18].…”
Section: Methodsmentioning
confidence: 99%