Effect of Quenching, Lamellarizing, and Tempering on Reversed Austenite and Cryogenic Toughness of 9Ni Steels

Zhang, Hongliang; Hou, Jiaping; Zhang, Dazheng; Li, Weijuan; Xu, Jiakai; Pang, Qing-hai; Zhu, Qingyan; Zhang, Junkai

doi:10.1007/s11665-023-08129-4

Cited by 7 publications

(2 citation statements)

References 29 publications

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“…The earlier studies have shown that the volume fraction of reversed austenite determines the cryogenic toughness of the test steel after QLT treatment, and the stability of reversed austenite is estimated by the partition of Ni and Mn elements in the intercritical quenching process [17][18][19][20]. Figure 9 shows test steel microstructure analysis after different intercritical quenching soaking times.…”

Section: Partition Mechanism Of Ni and Mn Elementsmentioning

confidence: 99%

“…Figure 9 shows test steel microstructure analysis after different intercritical quenching soaking times. Literature [20] shows that the increase of intercritical quenching temperature is conducive to the reversed austenite segregation of Ni and Mn elements. The reversed austenite in tested steel preferentially nucleates and grows along the boundary of high dislocation density lath martensite, where Ni and Mn elements continuously diffuse from BCC structure ferrite to FCC structure austenite.…”

Section: Partition Mechanism Of Ni and Mn Elementsmentioning

confidence: 99%

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Effect of intercritical quenching soaking time on cryogenic toughness and internal friction characterization of 9Ni steel

Wang,

Pang,

Cui

et al. 2023

Mater. Res. Express

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Quenching, intercritical quenching and high temperature tempering of 9Ni steel is widely used in large-size and high-capacity liquefied natural gas storage tanks due to its excellent mechanical properties at low temperatures. This paper studied the microstructure, internal friction and mechanical properties of different intercritical quenching heat soaking times on the cryogenic toughness of 9Ni steel. The effect of martensitic strip thickness change on thermal stability and morphology of reversed austenite after intercritical quenching heat soaking time of 9Ni steel was revealed. The findings show that the thickness of the martensitic slats increases by 4.5 μm when the intercritical quenching of steel is conducted for 50 min, and the maximum concentration of Ni and Mn reaches 13.5 % and 10.25 %, respectively. The volume fraction of thin film reversed austenite is about 5 %. Different frequency under the condition of isothermal Snoek-Kê-Köster peak changes shows there will be a loss of mechanical energy in the process of phase transition.They are important factors for the maximum volume fraction of 9Ni steel film reversed austenite and the significant improvement of cryogenic toughness.

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Section: Partition Mechanism Of Ni and Mn Elementsmentioning

confidence: 99%

Section: Partition Mechanism Of Ni and Mn Elementsmentioning

confidence: 99%

Effect of intercritical quenching soaking time on cryogenic toughness and internal friction characterization of 9Ni steel

Wang,

Pang,

Cui

et al. 2023

Mater. Res. Express

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Study on Strain Hardening and Cryogenic Toughness of Marine 10Ni5CrMoV Steel during Tempering

Zou,

Dong,

Jiang

et al. 2024

steel research int.

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The tempering process is applied in marine 10Ni5CrMoV steel to study microstructure, and mechanical properties by multi‐scale characterizations, strain hardening behavior, and cryogenic toughening mechanism are further investigated. As the tempering temperature increases from 590 to 630 °C, the dislocation density decreases by up to 25% and the austenite volume fraction decreases by up to 35%. Additionally, the morphology of austenite changes from strip to bulk, which weakened the pinning effect on the laths, leading to a coarsened martensite and an increase in the equivalent grain size. Based on the modified Crussard–Jaoul analysis, the specimens at different tempering temperatures exhibit a single‐stage strain hardening behavior during plastic deformation. The increase in strength is attributed to the continuous transformation‐induced plasticity effect and the increasing dislocation density. Furthermore, high austenite volume fraction and the proportion of grain boundary misorientation above 45° promote the release of stress concentration and hinder the propagation of cracks. This results in an increase in the ductile–brittle transition temperature (DBTT) of the specimens from −105 to −135 °C. At a tempering temperature of 610 °C, the specimen demonstrates an outstanding balance between yield strength (868 MPa) and cryogenic toughness (DBTT of −135 °C).

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Mechanism of the Interaction Between Hydrogen, Microstructure, and Mechanical Properties in Low-Alloy High-Strength Marine Steel

Zhang,

Li,

et al. 2023

J. of Materi Eng and Perform

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Effect of Quenching, Lamellarizing, and Tempering on Reversed Austenite and Cryogenic Toughness of 9Ni Steels

Cited by 7 publications

References 29 publications

Effect of intercritical quenching soaking time on cryogenic toughness and internal friction characterization of 9Ni steel

Effect of intercritical quenching soaking time on cryogenic toughness and internal friction characterization of 9Ni steel

Study on Strain Hardening and Cryogenic Toughness of Marine 10Ni5CrMoV Steel during Tempering

Mechanism of the Interaction Between Hydrogen, Microstructure, and Mechanical Properties in Low-Alloy High-Strength Marine Steel

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