Effects of the strain rate on the tensile properties of a TRIP-aided duplex stainless steel

Choi, Jae Yeon; Lee, Jae-Eun; Lee, Keunho; Koh, Ji-Yeon; Cho, Jae-Hyung; Han, Heung Nam; Park, Kyung‐Tae

doi:10.1016/j.msea.2016.04.047

Cited by 50 publications

(19 citation statements)

References 22 publications

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“…9. This substructure develops due to the relative ease of cross-slip in the bcc phase (24 potential slip systems, {110}<111> and {112}<111>) [8,51]. The deformation of the γ phase on the other hand is more dependent on the alloy composition and the deformation temperature.…”

Section: Deformation Behaviour Of Individual Constituentsmentioning

confidence: 99%

Micromechanics and microstructure evolution during in situ uniaxial tensile loading of TRIP-assisted duplex stainless steels

Tian

Lin

et al. 2018

Materials Science and Engineering: A

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Two transformation-induced plasticity (TRIP) assisted duplex stainless steels, with three different stabilities of the austenite phase, were investigated by synchrotron X-ray diffraction characterization during in situ uniaxial tensile loading. The micromechanics and the deformation-induced martensitic transformation (DIMT) in the bulk of the steels were investigated in situ. Furthermore, scanning electron microscopy supplemented the in situ analysis by providing information about the microstructure of annealed and deformed specimens. The dependence of deformation structure on austenite stability is similar to that of single-phase austenitic steels where shear bands and bcc-martensite (α') are generally observed, and blocky α' is only frequent when the austenite stability is low. These microstructural features, i.e. defect structure and deformation-induced martensite, are correlated with the micro-and macro-mechanics of the steels with elastoplastic load transfer from the weaker phases to the stronger α', in particular this occurs close to the point of maximum rate of α' formation. A clear strain-hardening effect from α' is seen in the most unstable austenite leading to a pronounced TRIP effect.

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Section: Deformation Behaviour Of Individual Constituentsmentioning

confidence: 99%

Micromechanics and microstructure evolution during in situ uniaxial tensile loading of TRIP-assisted duplex stainless steels

Tian

Lin

et al. 2018

Materials Science and Engineering: A

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“…According to the results in Figure , it is clear that the TRIP effect during plastic deformation would be suppressed with the increase of strain rate, which can be explained by adiabatic heating . The heat evolution during tensile deformation can lead to the increase of temperature in specimens, as presented in Figure a.…”

Section: Resultsmentioning

confidence: 87%

“…The heat evolution during tensile deformation can lead to the increase of temperature in specimens, as presented in Figure a. The adiabatic heating was sufficient to suppress the strain induced martensitic transformation due to a reduction in chemical driving force for the transformation from austenite to martensite . Thus, the ultimate tensile strength and total elongation of the novel TRIP‐aided Ni‐free lean duplex stainless steel would be significantly decreased with the increase of strain rate.…”

Section: Resultsmentioning

confidence: 99%

“…Herrera et al and Choi et al have developed the novel 1 GPa TRIP‐aided lean duplex stainless steels and researched the microstructure evolution during plastic deformation. The effects of heat treatment temperature, deformation temperature, and strain rate on these TRIP‐aided stainless steels have been intensively investigated. However, most of the existed studies focus on the mechanical properties of this type of stainless steels but neglect the corresponding corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of a Novel TRIP‐Aided Ni‐Free Lean Duplex Stainless Steel with Good Corrosion Resistance by Twin‐Roll Strip Casting and Its Deformation Mechanisms

Zhao

Wang

Zhu

et al. 2018

steel research int.

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The thin strip of novel TRIP-aided Ni-free lean duplex stainless steel with good corrosion resistance is fabricated by twin-roll strip casting. The microstructure, corrosion resistance, and mechanical properties of the present Ni-free steel (DSS-2) are investigated in detail in this study. Meanwhile, comparison with duplex stainless steel containing about 2% Ni (DSS-1) is also conducted to discuss the effect of alloying Ni on corrosion resistance and mechanical properties. The DSS-2 has the more excellent mechanical properties than the comparison steel DSS-1 due to the strain induced martensitic transformation during plastic deformation, which the ultimate tensile strength and total elongation are measured to be about 960 MPa and 55%, respectively. The strain induced martensitic transformation in DSS-2 will be suppressed with the increase of solid solution treatment temperature and strain rate. The austenitic stability is more dependent on element partitioning in austenite phase than on grain size of austenite for the present TRIP-aided Ni-free lean duplex stainless steel. The novel Ni-free steel has the better corrosion resistance and mechanical properties than the austenitic stainless steel SUS304, which may potentially be applied to substitute SUS304 in some fields as anti-corrosive structural material.

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“…The critical behavior of multiphase steels depends on the mechanical stability and properties of each phase [23][24][25][26]. During deformation, the softer phase yields first and, after the appropriate degree of work hardening, a suitable amount of stress is transferred to the harder regions.…”

Section: Introductionmentioning

confidence: 99%

Effects of Phase Evolution on Mechanical Properties of Laser-Welded Ferritic Fe-Al-Mn-C Steel

Kang

Kim

Han

et al. 2017

Metals

Self Cite

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Abstract:In the present study, the evolution of microstructure in laser-welded joints of ferrite-based dual-phase Fe-Al-Mn-C steel sheets was analyzed and its effect on the mechanical properties of the joints was investigated. Laser welding was performed using different powers and welding speeds to attain different heat inputs. Electron backscatter diffraction (EBSD) examinations and hardness measurements were used to characterize the microstructure of the welds. The tensile properties were found to depend on the heat input, but joint strength exceeding that of the base metal (BM) were obtained at low heat inputs. However, the fracture location shifted from the base metal to the heat-affected zone (HAZ) as the heat input was increased. The HAZ consisted of a mixture of austenite, ferrite and martensite, and its width increased with increasing the heat input. It was supposed that the incompatibility between the ferrite, austenite and martensite phases led to early void formation and fracturing of the phase interfaces in the wide HAZ.

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Effects of the strain rate on the tensile properties of a TRIP-aided duplex stainless steel

Cited by 50 publications

References 22 publications

Micromechanics and microstructure evolution during in situ uniaxial tensile loading of TRIP-assisted duplex stainless steels

Micromechanics and microstructure evolution during in situ uniaxial tensile loading of TRIP-assisted duplex stainless steels

Fabrication of a Novel TRIP‐Aided Ni‐Free Lean Duplex Stainless Steel with Good Corrosion Resistance by Twin‐Roll Strip Casting and Its Deformation Mechanisms

Effects of Phase Evolution on Mechanical Properties of Laser-Welded Ferritic Fe-Al-Mn-C Steel

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