Microstructure and Mechanical Properties of Austenitic Stainless Steels after Dynamic and Post‐Dynamic Recrystallization Treatment

Tikhonova, Marina; Kaibyshev, Rustam; Belyakov, Andrey

doi:10.1002/adem.201700960

Cited by 56 publications

(18 citation statements)

References 194 publications

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“…The flow stress can be expressed by a power law function of Z with an exponent of 0.2 in the range of low Z in Figure 3. This agrees well with other studies on hot working and creep at elevated temperatures, when the power law relationship generally holds between the flow stress and strain rate with a stress exponent of 5 [18,20]. In contrast, the temperature and/or strain rate effect on the flow stress diminishes with an increase in Z.…”

Section: Hot Deformation Behaviorsupporting

confidence: 91%

“…The absolute value of the grain size exponent in the relationship between D and σ ss decreases from 0.8 to 0.5 with an increase in the flow stress. Almost the same change in the grain size exponent has been observed in other austenitic steels subjected to warm deformation [2,18]. This change in the σ-D −N relationship has been attributed to the change in the DRX mechanism.…”

Section: Microstructures and Textures After Hot Compressionssupporting

confidence: 66%

“…Discontinuous DRX develops cyclically, including a consequence of the repetitive processes of DRX nucleation and DRX grain growth during the hot deformation. In this case, the mean DRX grain size can be related to the flow stress through a power law function with a grain size exponent of about −0.7 [2,7,[17][18][19]. The grain refinement by means of DRX should lead to strengthening in accordance with a well-known Hall-Petch relationship.…”

Section: Introductionmentioning

confidence: 83%

“…Austenitic steels with low SFE commonly experience discontinuous DRX under the conditions of hot working [2,5,[16][17][18]. This DRX mechanism is forced by high dislocation density, i.e., work-hardening, and consists in the new grain nucleation by local migration of frequently serrated grain boundaries followed by the growth of the just-nucleated grains until a cessation of their growth.…”

Section: Introductionmentioning

confidence: 99%

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Dynamically Recrystallized Microstructures, Textures, and Tensile Properties of a Hot Worked High-Mn Steel

Dolzhenko

Tikhonova

Kaibyshev

et al. 2019

Metals

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The deformation microstructures and mechanical properties were studied in a high-Mn steel subjected to hot compression. The deformation microstructures resulted from the development of dynamic recrystallization (DRX). Two DRX mechanisms, namely discontinuous and continuous, operated during warm-to-hot working. Under the conditions of hot working when the flow stresses were below 100 MPa, a power law function was obtained between the DRX grain size and the true flow stress with a grain size exponent of −0.8 owing to the discontinuous DRX. On the other hand, the gradual change in the operating DRX mechanism from a discontinuous to continuous one upon a transition from hot to warm working, when the true flow stress increases above 100 MPa, resulted in the grain size exponent of about −0.5 in the power law between the flow stress and the DRX grain size. The DRX microstructures developed by warm-to-hot working provide a beneficial combination of mechanical properties including high ultimate tensile strength in the range of 700–900 MPa and sufficient ductility with a uniform elongation well above 50%. The strengthening of the samples with DRX microstructures was attributed to the combined effect of the grain size and dislocation strengthening resulting in a rather high grain boundary strengthening factor of 570 MPa μm0.5 in the Hall-Petch-type relationship.

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Section: Hot Deformation Behaviorsupporting

confidence: 91%

Section: Microstructures and Textures After Hot Compressionssupporting

confidence: 66%

Section: Introductionmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dynamically Recrystallized Microstructures, Textures, and Tensile Properties of a Hot Worked High-Mn Steel

Dolzhenko

Tikhonova

Kaibyshev

et al. 2019

Metals

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“…Further analysis showed that both steels had practically identical microstructural features and, as a result, strength properties. The grain refinement by means of large strain deformation results commonly in substantial strengthening and significant degradation of plasticity (Tikhonova, Kaibyshev, & Belyakov, ). However, the present ultrafine‐grained (UFG) steels differ from other UFG alloys processed by severe plastic deformation by remarkable plasticity with total elongation above 15%.…”

Section: Discussionmentioning

confidence: 99%

The influence of ultrafine‐grained structure on the mechanical properties and biocompatibility of austenitic stainless steels

et al. 2019

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In this study, equal‐channel angular pressing (ECAP) of austenitic 316L and Cr–Ni–Ti stainless steels was carried out. Effect of ECAP at 400°C on the evolution of the microstructure, mechanical properties, and biocompatibility of these steels was investigated. The biocompatibility of samples with the ultrafine grain structure obtained in the ECAP process did not deteriorate in comparison with an austenitic 316L stainless steel in coarse‐grained state. However, this treatment enhances the multipotent mesenchymal stromal/stem cell proliferation by 26% for 316L steel and by 17% for Cr–Ni–Ti stainless steel in comparison with coarse‐grained counterparts. At the same time, ECAP contributes to a significant improvement in performance and weight reduction of medical devices, which is especially important for the creation of implanted prostheses for replacement of skeletal defects, due to significant increase in specific strength of steels. The strength properties of austenitic stainless steels were remarkably improved due to the grain refinement and deformation twinning resulted from ECAP at 400°C. After ECAP, the yield strength of 316L and Cr–Ni–Ti stainless steels increased by 4.2 and 2.9 times up to 950 and 900 MPa, and the fatigue limit by 2 and 1.7 times up to 500 and 475 MPa, respectively, comparing to coarse‐grained counterparts.

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Hot Deformation and Dynamic Recrystallization of 18%Mn Twinning‐Induced Plasticity Steels

et al. 2020

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The deformation behavior of 18%Mn twinning‐induced plasticity (TWIP) steels with 0.4%C or 0.6%C is studied by means of isothermal compression tests in the temperature range of 973–1373 K at the strain rates of 10−3–10−1 s−1. The hot working is accompanied by the development of discontinuous dynamic recrystallization (DRX), which is commonly advanced by an increase in deformation temperature and/or a decrease in strain rate. A decrease in the carbon content promotes the DRX development, though the flow stresses scarcely depend on the carbon content. The change in the DRX kinetics results in the specific distributions of the grain orientation spread (GOS) among the DRX grains, depending on deformation conditions. The maximal fraction of grains with small GOS below 1° corresponding to rapid DRX development is observed at certain temperature/strain rate, although the DRX fraction increases with a decrease in temperature‐compensated strain rate and can be related to the fraction of grains with GOS below 4°. The texture of DRX grains is also determined by the orientations of grains with GOS below 4°. The grain boundary mobility for the DRX grain growth is characterized by an activation energy close to that for grain boundary diffusion.

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Microstructure and Mechanical Properties of Austenitic Stainless Steels after Dynamic and Post‐Dynamic Recrystallization Treatment

Cited by 56 publications

References 194 publications

Dynamically Recrystallized Microstructures, Textures, and Tensile Properties of a Hot Worked High-Mn Steel

Dynamically Recrystallized Microstructures, Textures, and Tensile Properties of a Hot Worked High-Mn Steel

The influence of ultrafine‐grained structure on the mechanical properties and biocompatibility of austenitic stainless steels

Hot Deformation and Dynamic Recrystallization of 18%Mn Twinning‐Induced Plasticity Steels

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