Structure formation, phase transformations and properties in Cr–Ni austenitic steel after equal-channel angular pressing and heating

Добаткин, С. В.; Rybalchenko, O. V.; Рааб, Г. И.

doi:10.1016/j.msea.2006.07.156

Cited by 42 publications

(20 citation statements)

References 3 publications

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“…This increase in the HV is plausible to be due to the precipitation of fine carbides. Dobatkin et al [23] reported that the similar hardening occurred by annealing at a temperature of 823 K (550°C) after processing a 0.07 pct C-17.3 pct Cr-9.2 pct Ni-0.7 pct Ti stainless steel by equal-channel angular pressing (ECAP), and they confirmed by TEM that carbide precipitation occurred in the ECAP+ annealed microstructure.…”

Section: Resultsmentioning

confidence: 88%

Effect of High-Pressure Torsion Processing and Annealing on Hydrogen Embrittlement of Type 304 Metastable Austenitic Stainless Steel

Mine

Tachibana

Horita

2010

Metall Mater Trans A

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The effect of high-pressure torsion (HPT) and annealing on hydrogen embrittlement (HE) of a type 304 stainless steel was studied by metallographic characterization and tensile test after hydrogen gas charging. A volume fraction of~78 pct of the austenite transformed to a¢ martensite by the HPT processing at an equivalent strain of~30. Annealing the HPT-processed specimen at a temperature of 873 K (600°C) for 0.5 hours decreased the a¢ martensite tõ 31 pct with the average grain size reduced to~0.43 lm through the reverse austenitic transformation. Hydrogen charge into the HPT-processed and the HPT+annealed specimens in the hydrogen content of~10 to 20 ppm led to no severe HE but appeared in the solution-treated specimen. Especially the 873 K (600°C) annealed specimen had the~1.4 GPa tensile strength and the~50 pct reduction of area (RA) despite the hydrogenation.

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Section: Resultsmentioning

confidence: 88%

Effect of High-Pressure Torsion Processing and Annealing on Hydrogen Embrittlement of Type 304 Metastable Austenitic Stainless Steel

Mine

Tachibana

Horita

2010

Metall Mater Trans A

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“…Numerous studies on the SPD processing of bulk metallic billets via ECAP have demonstrated that the increase in hardness and strength is observed after the initial one or two passes, after which further strengthening becomes much slower [21][22][23]. Meanwhile, the possibilities for strength enhancement in a material have not yet been exhausted.…”

Section: Discussionmentioning

confidence: 99%

Superior Strength of Austenitic Steel Produced by Combined Processing, including Equal-Channel Angular Pressing and Rolling

Karavaeva

Abramova

Enikeev

et al. 2016

Metals

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Enhancement in the strength of austenitic steels with a small content of carbon can be achieved by a limited number of methods, among which is ultrafine-grained (UFG) structure formation. This method is especially efficient with the use of severe plastic deformation (SPD) processing, which significantly increases the contribution of grain-boundary strengthening, and also involves a combination of the other strengthening factors (work hardening, twins, etc.). In this paper, we demonstrate that the use of SPD processing combined with conventional methods of deformation treatment of metals, such as rolling, may lead to additional strengthening of UFG steel.In the presented paper we analyze the microstructure and mechanical properties of the Cr-Ni stainless austenitic steel after a combined deformation. We report on substantial increases in the strength properties of this steel, resulting from a consecutive application of SPD processing via equal-channel angular pressing and rolling at a temperature of 400 • C. This combined loading yields a strength more than 1.5 times higher than those produced by either of these two techniques used separately.

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“…The possibility of increasing the mechanical and performance characteristics, including durability under high‐cycle fatigue conditions due to the ultrafine‐grained (UFG) structure in austenitic stainless steels after severe plastic deformation using the equal channel angular pressing (ECAP) was proved (Dobatkin, Rybal'chenko, & Raab, ; Dong et al, ; Huang, Yang, Gao, Wu, & Zhang, ; Ueno, Kakihata, Kaneko, Hashimoto, & Vinogradov, ). Increasing the specific strength of UFG steel at static and cyclic loads will significantly reduce the weight of implanted products in contrast to conventional coarse‐grained steels.…”

Section: Introductionmentioning

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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Structure formation, phase transformations and properties in Cr–Ni austenitic steel after equal-channel angular pressing and heating

Cited by 42 publications

References 3 publications

Effect of High-Pressure Torsion Processing and Annealing on Hydrogen Embrittlement of Type 304 Metastable Austenitic Stainless Steel

Effect of High-Pressure Torsion Processing and Annealing on Hydrogen Embrittlement of Type 304 Metastable Austenitic Stainless Steel

Superior Strength of Austenitic Steel Produced by Combined Processing, including Equal-Channel Angular Pressing and Rolling

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

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