Thermal activation process of plastic deformation in Fe–18Cr single-crystal micropillars with high-density dislocations

Li, Hongmei; Tianqi, Zhu; Takata, Naoki; Kobashi, Makoto; Yoshino, Masataka

doi:10.1016/j.msea.2021.141459

Cited by 9 publications

(1 citation statement)

References 36 publications

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“…Our future work awaits a fundamental investigation of the strength and its strain rate sensitivity of ferritic single-crystals containing fine precipitates of carbides/nitrides in terms of the thermal activation process of plastic deformation. [37][38][39]…”

Section: Discussionmentioning

confidence: 99%

Influence of Stabilizing Elements on Ductile-Brittle Transition Temperature (DBTT) of 18Cr Ferritic Stainless Steels

Yoshino¹,

Tagawa²,

et al. 2022

ISIJ Int.

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The influence of different stabilizing elements (Nb, Ti and Zr) which are added to stabilize interstitial elements in the ferrite matrix on the ductile-brittle transition temperature (DBTT) of 18Cr ferritic stainless steels was systematically investigated at different temperatures ranging from −25°C to 75°C. Hot-rolled sheets of 18 mass% Cr ferritic stainless steels containing a trace amount (0.1 atomic%) of Nb, Ti or Zr were studied. The added stabilizing elements formed precipitates of carbides/nitrides in all the steels tested in the present study. The particle diameter of the precipitates observed in the Nb-added steel was much smaller than those in the other steels. The measured DBTTs of the Base steel and the Nb-added, Ti-added and Zr-added steels were 39°C, −3°C, 39°C and 11°C, respectively. Although initiation of cleavage cracks in each steel occurred independent of the kind of stabilizing element, the Nb-added steel exhibited a relatively higher Charpy impact value due to ductile plastic deformation following cleavage crack initiation, resulting in a lower DBTT (superior impact toughness). The occurrence of plastic deformation in the Nb-added steel is considered to be due to the fine carbide and/or nitride precipitates which were homogenously distributed in the material. Detailed analyses of the fracture surfaces were also performed for the other steels, and the results were used as a basis for discussing the effects of each stabilizing element on the DBTT of 18Cr ferritic stainless steels in terms of the precipitation morphologies observed in the ferrite matrix.

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Section: Discussionmentioning

confidence: 99%

Influence of Stabilizing Elements on Ductile-Brittle Transition Temperature (DBTT) of 18Cr Ferritic Stainless Steels

Yoshino¹,

Tagawa²,

et al. 2022

ISIJ Int.

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Effect of Cr Content on Hot Deformation Behavior and Microstructure Evolution of Cu–Cr–Ni Bridge Weathering Steel

Xu,

Zhang,

Zhang

et al. 2024

steel research int.

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The hot compression tests (T = 850–1100 °C, = 0.1–10 s−1) of Cu–Cr–Ni bridge weathering steel with different Cr content (0.46% (#1), 0.64% (#2)) were performed on Gleeble‐3800‐D thermomechanical simulator. The effects of Cr content on hot deformation and microstructure evolution are systematically investigated by the Arrhenius constitutive equation, processing map, electron backscatter diffraction technology, and transmission electron microscope. In the results, it is demonstrated that the increase of Cr content from 0.46% to 0.64% enhances the solution strengthening and inhibits the dynamic recrystallization of the experimental steels during hot compression, resulting in the increase of flow stress. The Arrhenius constitutive equation with strain compensation is constructed. The increase of Cr content results in an augmentation of hot deformation activation energy, rising from Q#1 = 358.47 kJ mol−1 to Q#2 = 396.79 kJ mol−1, causing the increase of deformation resistance of Cu–Cr–Ni bridge weathering steel in hot compression. The optimal hot processing window of #1 and #2 experimental steels is as follows: = 0.1–0.2 s−1, T = 1050–1100 °C, = 0.1–0.15 s−1, and T = 1050–1100 °C, the increase of Cr content leads to the narrowing of the hot processing window of the experimental steels.

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The thermally activated deformation behaviour of single-crystalline microcast aluminium wires

2022

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Thermal activation process of plastic deformation in Fe–18Cr single-crystal micropillars with high-density dislocations

Cited by 9 publications

References 36 publications

Influence of Stabilizing Elements on Ductile-Brittle Transition Temperature (DBTT) of 18Cr Ferritic Stainless Steels

Influence of Stabilizing Elements on Ductile-Brittle Transition Temperature (DBTT) of 18Cr Ferritic Stainless Steels

Effect of Cr Content on Hot Deformation Behavior and Microstructure Evolution of Cu–Cr–Ni Bridge Weathering Steel

The thermally activated deformation behaviour of single-crystalline microcast aluminium wires

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