Evaluation of thermal embrittlement in 2507 super duplex stainless steel using thermoelectric power

Gutiérrez-Vargas, Gildardo; Ruíz, Alberto; Kim, Jin‐Yeon; López-Morelos, Víctor H.; Ambriz, R.R.

doi:10.1016/j.net.2019.05.017

Cited by 20 publications

(1 citation statement)

References 24 publications

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“…This kind of stainless steel undergoes thermal aging embrittlement during long-term service in reactors (~288-327 • C,~16 MPa), resulting in deficient impact toughness and poor corrosion resistance [13][14][15]. The main problem is that the cast austenitic stainless steel parts in the main coolant pipeline of the primary circuit are pressurized; thus, it is difficult to detect their mechanical properties directly [16][17][18][19]. Therefore, the prediction model and evaluation procedure of thermal aging embrittlement behavior are especially important for in-service inspections, safety assessments and life extension activities of nuclear power plants.…”

Section: Introductionmentioning

confidence: 99%

The Microstructure and Mechanical and Corrosion Behaviors of Thermally Aged Z3CN20-09M Cast Stainless Steel for Primary Coolant Pipes of Nuclear Power Plants

et al. 2021

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The effects of thermal aging time at 400 °C on the microstructure and mechanical and corrosion behaviors of Z3CN20.09M cast stainless steel were investigated; and the corresponding thermal aging mechanism was studied. It was revealed that the changes in mechanical properties after thermal aging were mainly caused by the iron-rich phase (α) and the chromium-rich phase (α’) produced by the amplitude-modulation decomposition of ferrite. A similar trend of thermoelectric potential during thermal aging was determined in relation to the Charpy impact energy. However, the corrosion resistance of Z3CN20.09M cast stainless steel deteriorates as thermal aging time increases. When the thermal aging is longer than 3000 h, the precipitation of G phase has a great influence on the corrosion resistance. The interfacial matching relationship between G phase and the surrounding ferrite was established by selected area electron diffraction of HRTEM. The relationship is of cube-on-cube phase boundary type. The impact fracture mechanisms in relation to thermal aging time were also studied and compared.

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Section: Introductionmentioning

confidence: 99%

The Microstructure and Mechanical and Corrosion Behaviors of Thermally Aged Z3CN20-09M Cast Stainless Steel for Primary Coolant Pipes of Nuclear Power Plants

et al. 2021

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Strengthening of duplex stainless steel processed by equal channel angular pressing (ECAP)

Serrano-Muñoz

Chand

Signorelli

et al. 2022

Int J Adv Manuf Technol

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This manuscript presents the study of the microstructural evolution, plastic anisotropy, and mechanical behavior of a duplex stainless steel (DSS) processed by the equal channel angular pressing (ECAP) technique. The ECAP process produced shear bands affecting both phases, austenite and ferrite, which in turns act as preferential sites for the appearance of the new ultrafine grains. Microstructural observations indicated grain sizes smaller than 300 nm in both phases. However, marked differences in the grain boundary misorientations were observed. Most ferrite grain boundaries showed low misorientations (average misorientation of 30°). In contrast, the austenite grain boundaries were mainly dominated by high-angle grain boundaries (average misorientation of 39°). The ECAP processing allowed to reach a yield strength over 1.1 GPa after one ECAP pass. Dislocations formed walls in the ferrite, while they were distributed evenly in the austenite grains creating plastic gradients between the two phases. Through the visco-plastic self-consistent model, it was found that austenite and ferrite strain hardening at different rates, generating plastic instabilities at different strain magnitudes. In this way, it was shown that austenite is the phase that provides more hardening while ferrite provides ductility. Regarding the anisotropy of the steel, crystal plasticity simulations showed that during the first passes of ECAP, the Lankford coefficients increase notably due to the heterogeneous microstructure of sheared grains with a higher density of defects forming subgrains in ferrite than austenite. Moreover, the austenite was more responsible for the larger planar anisotropy ($$\Delta r$$ Δ r = 2.18) values than ferrite ($$\Delta r$$ Δ r = 1.67) after two ECAP passes.

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New Insights into the Nondestructive Evaluation of Thermally Aged at 475 °C Duplex Stainless Steels: A Comparative Study Between 2507 and 2101 Duplex Stainless Steels

Rodríguez-García

Ruíz

2022

J. of Materi Eng and Perform

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Evaluation of thermal embrittlement in 2507 super duplex stainless steel using thermoelectric power

Cited by 20 publications

References 24 publications

The Microstructure and Mechanical and Corrosion Behaviors of Thermally Aged Z3CN20-09M Cast Stainless Steel for Primary Coolant Pipes of Nuclear Power Plants

The Microstructure and Mechanical and Corrosion Behaviors of Thermally Aged Z3CN20-09M Cast Stainless Steel for Primary Coolant Pipes of Nuclear Power Plants

Strengthening of duplex stainless steel processed by equal channel angular pressing (ECAP)

New Insights into the Nondestructive Evaluation of Thermally Aged at 475 °C Duplex Stainless Steels: A Comparative Study Between 2507 and 2101 Duplex Stainless Steels

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