Precipitation behavior in G-phase strengthened ferritic stainless steels

Yang, Mujin; King, D.J.M.; Povstugar, Ivan; Wen, Yuren; Luan, Junhua; Kuhn, Bernd; Jiao, Zengbao; Wang, Cuiping; Wenman, M.R.; Liu, Xingjun

doi:10.1016/j.actamat.2020.116542

Cited by 30 publications

(5 citation statements)

References 40 publications

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“…-Ni and Ti rich precipitates, with rod shapes, that may be assigned to Ni 3 Ti as it will be confirmed with structural characterization; -Cu rich globular precipitates; -Si, Ni, and Ti rich globular precipitates that might be silicide Ni 16 Ti 6 Si 7 G-phase as identified in the literature [22] and as it will be confirmed with structural characterization.…”

Section: 4614 and 14543 Maraging Microstructuresupporting

confidence: 75%

“…It also permits us to demonstrate that these precipitates present preferential orientation relations with the martensitic matrix, with relations already reported in the literature [8,11], namely: The 1.4543 nanometric precipitation state after 550 °C aging is much more complex. be confirmed with structural characterization; -Cu rich globular precipitates; -Si, Ni, and Ti rich globular precipitates that might be silicide Ni16Ti6 identified in the literature [22] and as it will be confirmed with structu zation. These precipitates in this 1.4543 550A steel are particularly tiny.…”

Section: 4614 and 14543 Maraging Microstructuresupporting

confidence: 68%

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Hydrogen Embrittlement Characterization of 1.4614 and 1.4543 Martensitic Precipitation Hardened Stainless Steels

Latu-Romain,

Schutz,

Martin

et al. 2024

Metals

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Hydrogen embrittlement (HE) of 1.4614 and 1.4543 maraging stainless steels is characterized with fine structural TEM-ASTAR, hydrogen electrochemical permeation, thermodesorption and tensile testing (with slow strain rate during H cathodic charging) experiments. Both solutions annealed and 550 °C aged states are studied. When aged, 1.4614 grade contains nanometric hexagonal Ni3Ti precipitates whereas 1.4543 grade contains three families of nanometric precipitates, namely, hexagonal Ni3Ti, non fcc-rich Cu and G-phase rich in Si, Ti and Ni with cube-cube relations with martensite. From the permeation and thermodesorption results, it appears that austenite and nanometric precipitates seem to constitute deep traps for hydrogen in both grades. From tensile tests with in situ H charging, 1.4614 and 1.4543 maraging grades show a high susceptibility to HE with relative reduction of area (RRA) strictly superior to 80% for both metallurgical states. The presence of retained austenite does not seem to bring any HE resistance because of its transformation into martensite during deformation.

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Section: 4614 and 14543 Maraging Microstructuresupporting

confidence: 75%

Section: 4614 and 14543 Maraging Microstructuresupporting

confidence: 68%

Hydrogen Embrittlement Characterization of 1.4614 and 1.4543 Martensitic Precipitation Hardened Stainless Steels

Latu-Romain,

Schutz,

Martin

et al. 2024

Metals

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“…The splitting of Al and Nb in the precipitates after 18 h resulted in at least three different types of precipitates according to the APT analysis. Through high-resolution TEM it was possible to identify that one of these is G-phase, with a cube-on-cube orientational relationship that previously has been reported in a ferritic stainless steel [54,55]. The formation of G-phase probably occurs after the initial splitting, where Al is rejected from the precipitates, hence allowing for Si to diffuse into the precipitate and form G-phase.…”

Section: Discussionmentioning

confidence: 57%

Design and Characterization of a Cobalt-Free Stainless Maraging Steel for Laser-Based Powder Bed Fusion

Riabov

Frisk²,

Thuvander

et al. 2022

SSRN Journal

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“…The selected area electron diffraction pattern and corresponding FFT pattern along the [001] crystalline axis were detected, and they are shown in Figure 7b,c,. After thermal aging at 15,000 h/400 °C, G phase and ferrite shared the same exponential crystal direction and plane [27][28][29]; i.e., G phase and ferrite have a cube-on-cube phase boundary relationship. The diffraction spots of the (044) crystal plane of G phase coincide with those of the (011) crystal plane of ferrite.…”

Section: Microstructurementioning

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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Precipitation behavior in G-phase strengthened ferritic stainless steels

Cited by 30 publications

References 40 publications

Hydrogen Embrittlement Characterization of 1.4614 and 1.4543 Martensitic Precipitation Hardened Stainless Steels

Hydrogen Embrittlement Characterization of 1.4614 and 1.4543 Martensitic Precipitation Hardened Stainless Steels

Design and Characterization of a Cobalt-Free Stainless Maraging Steel for Laser-Based Powder Bed Fusion

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

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