Effect of ultrafine-grained microstructure on creep behaviour in 304L austenitic steel

Král, Pétr; Dvořák, Jiří; Sklenička, V.; Horita, Zenji; Takizawa, Yukio; Tang, Yongpeng; Kvapilová, Marie; Svobodová, Marie

doi:10.1016/j.msea.2020.139383

Cited by 11 publications

(10 citation statements)

References 51 publications

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“…For this reason, SPD techniques provide a unique opportunity to study the influence of significantly different microstructures on creep behavior of metals. Recent results showed that differences in the creep strength of SPD-processed state and its undeformed counterpart depend on the value of plastic strain imposed into the material [ 10 , 11 , 12 , 13 , 14 ], temperature, and applied stress used during creep testing [ 15 , 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Predeformation on Creep Strength of 9% Cr Steel

et al. 2020

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Martensitic creep-resistant P92 steel was deformed by different methods of severe plastic deformation such as rotation swaging, high-pressure sliding, and high-pressure torsion at room temperature. These methods imposed significantly different equivalent plastic strains of about 1–30. It was found that rotation swaging led to formation of heterogeneous microstructures with elongated grains where low-angle grain boundaries predominated. Other methods led to formation of ultrafine-grained (UFG) microstructures with high frequency of high-angle grain boundaries. Constant load tensile creep tests at 873 K and initial stresses in the range of 50 to 300 MPa revealed that the specimens processed by rotation swaging exhibited one order of magnitude lower minimum creep rate compared to standard P92 steel. By contrast, UFG P92 steel is significantly softer than standard P92 steel, but differences in their strengths decrease with increasing stress. Microstructural results suggest that creep behavior of P92 steel processed by severe plastic deformation is influenced by the frequency of high-angle grain boundaries and grain coarsening during creep.

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Section: Introductionmentioning

confidence: 99%

The Effect of Predeformation on Creep Strength of 9% Cr Steel

et al. 2020

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“…Then, the twin structures reduce and strengthen the interaction of grain boundary deformation at high temperature. Kral et al [ 39 ] showed that high fraction of low‐misorientation angle grain boundaries and less Σ3 grain boundaries appear near the fracture in 304L.…”

Section: Properties At Elevated Temperaturesmentioning

confidence: 99%

“…Zhang et al [ 29 ] also found the similar phenomenon and thought that the transformation from <111>//RD at high stress to <001>//RD at low stress needs to active the lowest strain energy. Kral et al [ 39 ] observed that the preferential direction of texture varies due to dynamic recrystallization during creep exposure. The texture 111//ND(normal direction) and 100//ND with the orientation <111> and <100>, which are perpendicular to stress axis in gauge length.…”

Section: Properties At Elevated Temperaturesmentioning

confidence: 99%

Precipitation and Properties at Elevated Temperature in Austenitic Heat‐Resistant Steels—A Review

Wang

Wei

et al. 2020

steel research int.

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The austenitic heat‐resistant steels are significant materials used in boilers and nuclear reactors, owing to the excellent creep, fatigue, corrosion resistance, and mechanical properties. The precipitation and properties degenerate with the increasing temperature. It is necessary to clarify the main precipitation and properties under the service situation. Herein, the characteristic of main precipitation and the potential degraded mechanism of creep, fatigue, oxidation resistance, and corrosion resistance at high temperature are briefly reviewed. The main secondary phases under prolonged service environment include MX phase, M23C6 carbide, Z phase, Laves phase, and σ phase. Precipitation scattered uniformly is conductive to strength properties of steel and vice versa. Coarsening precipitation and the decrease of dislocation density are critical reason for the deteriorated mechanical properties at high temperature. The protective oxide films destroyed after exposure to boiler gas lead to failure of materials.

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“…The large strains imposed into the microstructure can also lead to phase transformation [ 11 , 12 , 13 ]. It was found that initially austenitic microstructure in stainless steels can be partially or fully transformed into strain-induced martensite [ 9 , 10 , 14 , 15 , 16 ]. This effect was used in previous studies for the production of ultrafine-grained austenitic steels through reversion transformation from strain-induced martensite [ 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Creep Resistance of S304H Austenitic Steel Processed by High-Pressure Sliding

et al. 2022

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Sheets of coarse-grained S304H austenitic steel were processed by high-pressure sliding (HPS) at room temperature and a ultrafine-grained microstructure with a mean grain size of about 0.14 µm was prepared. The microstructure changes and creep behavior of coarse-grained and HPS-processed steel were investigated at 500–700 °C under the application of different loads. It was found that the processing of S304H steel led to a significant improvement in creep strength at 500 °C. However, a further increase in creep temperature to 600 °C and 700 °C led to the deterioration of creep behavior of HPS-processed steel. The microstructure results suggest that the creep behavior of HPS-processed steel is associated with the thermal stability of the SPD-processed microstructure. The recrystallization, grain growth, the coarsening of precipitates led to a reduction in creep strength of the HPS-processed state. It was also observed that in the HPS-processed microstructure the fast formation of σ-phase occurs. The σ-phase was already formed during slight grain coarsening at 600 °C and its formation was enhanced after recrystallization at 700 °C.

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Effect of ultrafine-grained microstructure on creep behaviour in 304L austenitic steel

Cited by 11 publications

References 51 publications

The Effect of Predeformation on Creep Strength of 9% Cr Steel

The Effect of Predeformation on Creep Strength of 9% Cr Steel

Precipitation and Properties at Elevated Temperature in Austenitic Heat‐Resistant Steels—A Review

Creep Resistance of S304H Austenitic Steel Processed by High-Pressure Sliding

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