Tensile deformation behavior of mechanically stabilized Fe-Mn austenite

Tomota, Yō; Strum, M.J.; Morris, J.W.

doi:10.1007/bf02674030

Cited by 21 publications

(6 citation statements)

References 14 publications

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“…These observations reveal that in the as-processed condition, the steel has a fully austenitic recrystallized structure and contains annealing twins, similar to other austenitic steels (Fig. 1c-f) 15,16,22,23,28,30,32 . In the fine-grain size condition, the major deformation mode during tensile testing at RT is found to be dislocation slip.…”

Section: Resultssupporting

confidence: 62%

“…However, in these alloys HCP εand BCC α′-martensitic transformation can take place during plastic deformation at low temperatures, or even in some cases during cooling 15 , which leads to embrittlement and hence premature fracture and low fracture toughness 16,17 . The martensitic transformation can be suppressed to a certain extent by increasing the Mn, Al, Si, or C content [18][19][20][21][22][23] or via grain refinement [24][25][26][27] . By use of these approaches, the highest cryogenic toughness value for a high-Mn steel presently achievable is about 220 J 15,16,22 .…”

mentioning

confidence: 99%

“…The martensitic transformation can be suppressed to a certain extent by increasing the Mn, Al, Si, or C content [18][19][20][21][22][23] or via grain refinement [24][25][26][27] . By use of these approaches, the highest cryogenic toughness value for a high-Mn steel presently achievable is about 220 J 15,16,22 . Regarding the second criterion, a survey of the literature reveals one Fe30Mn steel 28 and some FeMnAl alloys 29 that exhibit an increase in both strength and ductility with decreasing temperature, though whether an inverse temperature dependence of toughness holds for these steels is not reported.…”

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confidence: 99%

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Cryogenic toughness in a low-cost austenitic steel

et al. 2021

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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.

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Section: Resultssupporting

confidence: 62%

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confidence: 99%

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confidence: 99%

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Cryogenic toughness in a low-cost austenitic steel

et al. 2021

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“…For the ε-stabilization, it is considered that the high density of dislocations in the ε-plates, formed by the intersections and the ε-twinning, would act as a barrier for the motion of transformation dislocations 7) . The decrease in A s is recognized as γ-austenite stabilization, and the effect of γ-stabilization by the introduction of dislocations is attributed to prior deformation 5,6) or to cyclic transformation 12,13) . From the higher dislocation density in γ-austenite in deformed specimens, it is considered that the residual γ-austenite remaining from martensitic transformation was highly stabilized by the plastic deformation.…”

Section: Factors Controlling Reverse Transformation Behaviormentioning

confidence: 99%

“…For example, a decrease in martensitic transformation start temperature, M s , by hot-rolling 5,6) has been reported. An increase in reverse transformation nish temperature, A f , occurs with an increase in the prestrain to induce martensitic transformation [7][8][9][10][11] .…”

Section: Introductionmentioning

confidence: 99%

Comparison of Reverse Transformation Behaviors of Thermally- and Deformation-Induced ε-Martensite in Fe-28Mn-6Si-5Cr Shape Memory Alloy

et al. 2016

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Reverse transformation behavior and the microstructures of ε-martensite induced by two different methods of cooling and deformation in Fe-28Mn-6Si-5Cr shape memory alloy was investigated. In situ heating X-ray diffraction (up to 673 K) was applied to the cooled and deformed specimens to observe the reverse transformation behavior. The microstructures in the cooled and deformed specimens were analyzed by electron backscattering diffraction. From X-ray diffraction patterns, the reverse transformation start temperature (A s ) in the deformed specimens was found to be lower than that in the cooled specimen, while the reverse transformation nish temperature (A f ) in the deformed specimens was higher than that in the cooled specimen. The electron back-scattering diffraction (EBSD) analysis revealed a higher fraction of low-angle misorientation boundaries in γ-austenite and ε-martensite in the deformed specimens than in the cooled specimens. Intersections of different ε-martensite variants with ε-twin were observed in the deformed specimens, while such intersections were not observed in the cooled specimens. A heterogeneous mixture of plastically deformed ε-martensite and γ-austenite were found in deformed specimens. It is considered that the heterogeneity of the microstructures led to the difference in reverse transformation temperatures of A s and A f in the thermally-induced and deformation induced maretnsites.

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Strength of ? and ??-martensites in Fe-14%Mn alloy

Durlu

1995

J Mater Sci Lett

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Tensile deformation behavior of mechanically stabilized Fe-Mn austenite

Cited by 21 publications

References 14 publications

Cryogenic toughness in a low-cost austenitic steel

Cryogenic toughness in a low-cost austenitic steel

Comparison of Reverse Transformation Behaviors of Thermally- and Deformation-Induced ε-Martensite in Fe-28Mn-6Si-5Cr Shape Memory Alloy

Strength of ? and ??-martensites in Fe-14%Mn alloy

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