Low strain rate deformation behavior of a Cr–Mn austenitic steel at −80 °C

Sahu, P. Ch.; Shee, S. K.; Hamada, Atef; Rovatti, Ludovica; Sahu, Trinath; Mahato, B.; Chowdhury, Sandip Ghosh; Porter, David; Karjalainen, L.P.

doi:10.1016/j.actamat.2012.07.055

Cited by 27 publications

(6 citation statements)

References 42 publications

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“…It is known that the SFE will drop as the temperature decreases, hence at cryogenic temperatures, the formation of shear bands, deformation twins and stacking faults can be enhanced [6,23]. Simulations using first-principles methods [24,25] confirm the temperature dependent behaviour of SFE and some predict that the SFE of tHEAs can even be negative at cryogenic temperatures [19,[26][27][28]. To validate the simulated results, the SFE of tHEAs at cryogenic temperatures need to be determined experimentally.…”

Section: Introductionmentioning

confidence: 99%

Probing deformation mechanisms of a FeCoCrNi high-entropy alloy at 293 and 77 K using in situ neutron diffraction

et al. 2018

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The deformation responses at 77 and 293 K of a FeCoNiCr high-entropy alloy, produced by a powder metallurgy route, are investigated using in situ neutron diffraction and correlative transmission electron microscopy. The strength and ductility of the alloy are significant improved at cryogenic temperatures. The true ultimate tensile strength and total elongation increased from 980 MPa and 45% at 293 K to 1725 MPa and 55% at 77K, respectively. The evolutions of lattice strain, stacking fault probability, and dislocation density were determined via quantifying the in situ neutron diffraction measurements. The results demonstrate that the alloy has a much higher tendency to form stacking faults and mechanical twins as the deformation temperature drops, which is due to the decrease of stacking fault energy (estimated to be 32.5 mJ/m 2 and 13 mJ/m 2 at 293 and 77 K, respectively). The increased volume faction of nanotwins and twin-twin intersections, formed during cryogenic temperature deformation, has been confirmed by transmission electron microscopy analysis. The enhanced strength and ductility at cryogenic temperatures can be attributed to the increased density of dislocations and nano-twins. The findings provide a fundamental understanding of underlying governing mechanistic mechanisms for the twinning induced plasticity in high entropy alloys, paving the way for the development of new alloys with superb resistance to cryogenic environments.

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Section: Introductionmentioning

confidence: 99%

Probing deformation mechanisms of a FeCoCrNi high-entropy alloy at 293 and 77 K using in situ neutron diffraction

et al. 2018

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“…Fe-Mn-Cr-based alloys display transformation induced plasticity (TRIP) [13] and twinning induced plasticity (TWIP) [18][19][20] which provide them outstanding formability. Fe-Mn-Cr alloys were also proposed as cryogenic steels [21][22][23] and as structural Ni-free stainless steels [11,12,21,[24][25][26]. In the case of cryogenic applications it is convenient to inhibit the martensitic transformation thus retaining the austenite down to very low temperatures.…”

Section: Introductionmentioning

confidence: 99%

Role of Mn and Cr on structural parameters and strain energy during FCC-HCP martensitic transformation in Fe-Mn-Cr shape memory alloys

et al. 2018

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“…1,2,8,9 For TWIP steels, the SFE influences a 'critical stress' for mechanical twinning, 13,[22][23][24][25][26] the twin fraction [27][28][29] and the twin thickness. [30][31][32] Until now, many researchers have investigated the effects of both alloying elements and temperature on the SFE value in various austenitic steels by means of X-ray 27,[33][34][35][36][37][38][39][40][41][42][43] and in situ neutron 9,29,[43][44][45][46][47] diffractometry, transmission electron microscopy, 43,[48][49][50][51][52][53][54][55][56][57][58][59][60]…”

Section: Introductionmentioning

confidence: 99%

Critical assessment 19: Stacking fault energies of austenitic steels

Lee¹,

Lee²,

Han³

2016

Materials Science and Technology

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The stacking fault energy (SFE) can play a key role in the deformation mechanism (e.g. transformation-induced plasticity and twinning-induced plasticity) of austenitic steels. Therefore, tremendous efforts have been devoted to exploring the evaluation methods and controlling parameters (e.g. alloying elements and temperature) that determine the SFE and its relationship to mechanical twinning. We provide here a summary of recent progress in studies of the SFE of austenite and of unsolved issues that may stimulate further investigation.

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Low strain rate deformation behavior of a Cr–Mn austenitic steel at −80 °C

Cited by 27 publications

References 42 publications

Probing deformation mechanisms of a FeCoCrNi high-entropy alloy at 293 and 77 K using in situ neutron diffraction

Probing deformation mechanisms of a FeCoCrNi high-entropy alloy at 293 and 77 K using in situ neutron diffraction

Role of Mn and Cr on structural parameters and strain energy during FCC-HCP martensitic transformation in Fe-Mn-Cr shape memory alloys

Critical assessment 19: Stacking fault energies of austenitic steels

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Low strain rate deformation behavior of a Cr–Mn austenitic steel at −80 °C

Cited by 27 publications

References 42 publications

Probing deformation mechanisms of a FeCoCrNi high-entropy alloy at 293 and 77 K using in situ neutron diffraction

Probing deformation mechanisms of a FeCoCrNi high-entropy alloy at 293 and 77 K using in situ neutron diffraction

Role of Mn and Cr on structural parameters and strain energy during FCC-HCP martensitic transformation in Fe-Mn-Cr shape memory alloys

Critical assessment 19: Stacking fault energies of austenitic steels

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Probing deformation mechanisms of a FeCoCrNi high-entropy alloy at 293 and 77 K using in situ neutron diffraction

Probing deformation mechanisms of a FeCoCrNi high-entropy alloy at 293 and 77 K using in situ neutron diffraction