Deformation twinning and its possible influence on the ductile brittle transition temperature of ferritic steels

Smida, T.; Bošanský, Ján

doi:10.1016/s0921-5093(00)00828-5

Cited by 41 publications

(12 citation statements)

References 16 publications

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“…Observations made in the case of microstructural analysis, for all TM processed states, concerning typical deformation morphologies for both the δ-phase (belonging to a BCC crystallographic system) and γ-phase (belonging to an FCC crystallographic system) are related to the higher potential of deformation/strain accommodation by slip/twinning and/or grain rotations of FCC systems, compared with BCC systems [29][30][31][32] for the same deformation stress level. For the same deformation stress level, if one considers the slip/twinning deformation mechanisms in correlation with the potential of deformation/strain accommodation, they will observe that the main influence factor is represented by the atomic density on the easiest to activate slip/twinning system [33,34]. In the case of FCC systems, the easiest to activate slip system is {111} <110>, while the easiest to activate twinning system is {111} <112>.…”

Section: Discussionmentioning

confidence: 99%

Influence of Aging Treatment on Microstructure and Tensile Properties of a Hot Deformed UNS S32750 Super Duplex Stainless Steel (SDSS) Alloy

Cojocaru

Răducanu

Nocivin

et al. 2020

Metals

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In this present study, the influence of isothermal aging temperature and duration on microstructural and mechanical properties of a hot-deformed UNS S32750 super duplex stainless steel (SDSS) alloy was investigated by SEM-EBSD (scanning electron microscopy-electron backscatter diffraction) and tensile testing techniques. An isothermal aging treatment, at temperatures between 400 and 600 °C and treatment duration between 3 and 120 h, was applied to a commercial UNS S32750 SDSS alloy. Microstructural characteristics of all thermomechanical (TM) processed states, such as distribution and morphology of constituent phases, grain’s modal orientation (MO), and obtained mechanical properties were analysed correlated with the TM processing conditions. The obtained experimental results show that the constituent phases, in all TM processed states, are represented by elongated γ-phase grains within the δ-phase matrix. The R-phase was observed in the case of aging treatment performed at 600 °C for 120 h. Within the δ-phase matrix, dynamically recrystallized grains were identified as a result of applying hot deformation and isothermal aging treatments. Also, it was observed that aging treatment parameters can significantly influence the mechanical behaviour exhibited by the UNS S32750 SDSS alloy, in terms of elongation to fracture and absorbed energy during impact testing.

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Section: Discussionmentioning

confidence: 99%

Influence of Aging Treatment on Microstructure and Tensile Properties of a Hot Deformed UNS S32750 Super Duplex Stainless Steel (SDSS) Alloy

Cojocaru

Răducanu

Nocivin

et al. 2020

Metals

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“…12,13) The decreased temperature will also support the piling up of dislocations in front of the twin boundary. 14) In conclusion, it indicates that deformation twinning could possibly play a significant role in the BDT of 400-18L ductile iron.…”

Section: Resultsmentioning

confidence: 81%

Fracture Mechanism of Ferritic Ductile Iron under Instrumented Impact Load at Low Temperatures

Xinning

2014

ISIJ Int.

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The impact toughness of 400-18L ductile iron (FCD400-18L) was measured by V-notch Charpy impact test at room and low temperatures. SEM and TEM were used to analyze the fracture mechanism. Experimental results show that the energy absorbed by impact test decreases significantly with the decrease of temperature. The fracture properties were measured using instrumented impact testing at temperatures between -80 and 20°C. The total impact fracture energy, the crack initiation and propagation energy, the dynamic loads and the ductile to brittle temperature were measured. The 400-18L ductile iron exhibited much higher resistance to ductile fracture at high test temperatures, while its resistance to brittle fracture at low test temperatures was reduced. The fracture morphology analysis was discussed in terms of the two fracture types: ductile fracture mechanism upon the BDTT (brittle to ductile transition temperature) and brittle fracture mechanism below the BDTT.

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“…16) On the other hand, fewer deformation twins were observed on the fractured surface in the 50% rolled alloy with local elongation. In this case, it is considered that dislocations piled up against obstacles, such as grain boundary, leads to initiation of cleavage fracture 7) and that the crack initiation site in Fe-5%Si alloy was changed with/without local elongation. It is difficult to detect a change of the fracture manner from brittle to ductile by conventional fractography clearly because all tensile specimen examined fractured in a brittle manner.…”

Section: Effect Of Pre-deformation On Fracturementioning

confidence: 99%

Effect of Pre-Deformation on Fracture Behavior Transition due to Strain-Rate Change in Fe-5%Si Alloy

Mizuguchi

Oouchi

Tanaka

2014

J. Soc. Mat. Sci., Japan

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Deformation twinning and its possible influence on the ductile brittle transition temperature of ferritic steels

Cited by 41 publications

References 16 publications

Influence of Aging Treatment on Microstructure and Tensile Properties of a Hot Deformed UNS S32750 Super Duplex Stainless Steel (SDSS) Alloy

Influence of Aging Treatment on Microstructure and Tensile Properties of a Hot Deformed UNS S32750 Super Duplex Stainless Steel (SDSS) Alloy

Fracture Mechanism of Ferritic Ductile Iron under Instrumented Impact Load at Low Temperatures

Effect of Pre-Deformation on Fracture Behavior Transition due to Strain-Rate Change in Fe-5%Si Alloy

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