Effect of ferrite-to-austenite phase transformation path on the interface crystallographic character distributions in a duplex stainless steel

Haghdadi, N.; Čížek, Pavel; Hodgson, Peter; Tari, Vahid; Rohrer, Gregory S.; Beladi, Hossein

doi:10.1016/j.actamat.2017.11.057

Cited by 96 publications

(52 citation statements)

References 50 publications

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“…And the color distribution of reformed austenite grains suggested their significant preferred orientation. Both N‐W and K‐S OR between reformed austenite and ferrite were revealed by selected area electron diffraction (SAED) under TEM, as shown in Figure , which was consistent with the results that reported by Haghdadi et al…”

Section: Resultssupporting

confidence: 91%

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Reformation Behavior of Austenite in 2205 Duplex Stainless Steel with Rapid Heat Treatment

Wang

et al. 2018

steel research int.

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The reformation behavior of austenite in coarsened ferrite grains of 2205 duplex stainless steel is studied by means of rapid heat treatment process. With the prolongation of peak temperature holding time, ferrite grains coarsen significantly from 200 µm at 1 s to over 1000 µm at 10 min, and the reformation of grain boundary austenite is suppressed while fine equiaxed intragranular austenite is promoted during the subsequent isothermal treatment at 850 °C owing to the reduction of total ferrite grain boundary area. With the decreasing of isothermal temperature, the microstructure evolution of reformed austenite from widmanstatten austenite to acicular austenite and finally to equiaxed austenite is observed, due to the increasing of the nucleation site density. The orientation relationships (OR) between reformed austenite and ferrite vary at different isothermal temperatures. The N‐W OR gradually changes into the K‐S OR with the increasing of isothermal temperature to lower the coherent elastic strain energy induced in ferrite matrix.

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Section: Resultssupporting

confidence: 91%

“…The crystallographic OR between WA and ferrite in DSS has been studied in depth. Both K‐S OR and N‐W OR between ferrite parent phase and austenite product phase have been confirmed by different researchers . However, the effect of austenite reformation temperature on the OR has received little attention up to now.…”

Section: Introductionmentioning

confidence: 86%

Reformation Behavior of Austenite in 2205 Duplex Stainless Steel with Rapid Heat Treatment

Wang

et al. 2018

steel research int.

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“…Ferrite starts to accommodate plastic deformation after austenite has work-hardened enough to increase its yield stress above that necessary to overcome the Peierls barriers in ferrite. After that, ferrite starts to accommodate higher plastic strain than austenite, while some austenitic grains experience a more pronounced increase in the hardening effect depending on the orientation relationship between austenite and ferrite (Kurdjumov-Sachs orientation is the most favourable for the transfer of strain field between austenite and ferrite [10,[55][56][57]). Direct dislocation transfer between austenite and ferrite is obviously impossible due to the phase boundary, but dislocations on the austenitic phase that keep piling up on the phase boundary could generate dislocation sources in the adjacent ferritic phase.…”

Section: Discussionmentioning

confidence: 99%

Influence of Electropulsing Treatments on Mechanical Properties of UNS S32750 Duplex Stainless Steel

et al. 2020

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Prestrained at 5% and 15% duplex stainless steel UNS S32750 specimens have been subjected to electropulsing treatments with current density of 100 A/mm2 and 200 A/mm2 and 100 and 500 pulses for each current density value. Corrosion tests, X-ray diffraction, microhardness and residual stresses were collected before and after the electropulsing treatments. Tensile tests were performed after the electropulsing treatments in order to compare the mechanical response to reference tensile tests performed before pulsing treatments. Increase in fracture strain was observed after pulsing treatment in comparison to the reference tensile tests. A decrease in microhardness was also observed after electropulsing treatments for both degrees of prestrain. Electropulsing treatment almost eliminates the work-hardened state in the 5% prestrained specimens while partially recovered the 15% prestrained material increasing both uniform and fracture strain. Bulk temperature of the samples remained the same for all treatments duration. The effect are to be addressed to a combined effect of increase in atomic flux due to the electrical current and local joule heating in correspondence of crystal defects. Electropulsing treatment applied to metallic alloys is a promising technique to reduce the work hardening state without the need of annealing treatments in a dedicated furnace.

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“…It can be observed that the sample consists of two major phases: δ-ferrite (bright yellow color) and Widmanstätten-like austenite (dark yellow color). 39) No sigma and/or any other intermetallic phases were formed in the microstructure. The austenite phase seems to precipitate from the parent ferriteferrite grain boundary during the δ → δ + γ solid-state phase transformation.…”

Section: Steel Microstructurementioning

confidence: 99%

Interactive Relationship between the Superheat, Interfacial Heat Transfer, Deposited Film and Microstructure in Strip Casting of Duplex Stainless Steel

et al. 2019

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Effect of ferrite-to-austenite phase transformation path on the interface crystallographic character distributions in a duplex stainless steel

Cited by 96 publications

References 50 publications

Reformation Behavior of Austenite in 2205 Duplex Stainless Steel with Rapid Heat Treatment

Reformation Behavior of Austenite in 2205 Duplex Stainless Steel with Rapid Heat Treatment

Influence of Electropulsing Treatments on Mechanical Properties of UNS S32750 Duplex Stainless Steel

Interactive Relationship between the Superheat, Interfacial Heat Transfer, Deposited Film and Microstructure in Strip Casting of Duplex Stainless Steel

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