Effect of ordered domains on the fracture toughness of high Co-Ni secondary hardening steel

Duan, Hao; Liu, Xiao; Ran, Xianzhe; Li, Jia; Liu, Dong

doi:10.1016/j.msea.2017.07.029

Cited by 12 publications

(3 citation statements)

References 10 publications

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“…They reduced markedly with the increase of the heat-treatment temperature and disappeared completely after the post-heat treatment at 550 o C and 600 o C for 2 h (Figure 5(e) and 5(f)). This is different from some observations for as-quenched high Co-Ni steels in literature [10,16,24]. It was reported that the retained austenite in the alloy steels also might lose stability and decompose into a mixture consisting of ferrite and carbides (mainly cementite) in the and 6).…”

Section: Effect Of Post-heat-treatment Temperature On the Coating Mic...contrasting

confidence: 56%

Effect of Post-heat Treatment on Microstructure and Mechanical Properties of Laser Cladded High Co-Ni Secondary Hardening Steel Coating

Qin,

Chen,

Zhang

et al. 2024

J. Phys.: Conf. Ser.

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The effect of post-heat treatment on the microstructure and microhardness of laser cladded high Co-Ni secondary hardening steel coating was investigated. The microstructures were analyzed using a SEM equipped with an EDS, and the microhardness was measured with a Vickers indenter. Decomposition of the retained austenite in the coating occurred during the post-heat treatment. As the temperature increased from 200 °C to 600 °C, the quantity of the retained austenite at the boundaries decreased significantly, while that of the needle-shaped M3C cementite and M2C carbides increased. The M2C carbides evidently coarsened when the temperature was higher than 500 °C. The microhardness of high Co-Ni steel coating increased as the temperature of post-heat treatment increased from 200 °C to 400 °C because the fine-scale M2C carbides were coherent with the matrix and increased distinctly in this temperature range. It decreased sharply when the temperature further increased from 500 °C to 600 °C due to both the incoherency of the coarsened M2C carbides and the recovery of dislocations in the carbon-supersaturated matrix.

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Section: Effect Of Post-heat-treatment Temperature On the Coating Mic...contrasting

confidence: 56%

Effect of Post-heat Treatment on Microstructure and Mechanical Properties of Laser Cladded High Co-Ni Secondary Hardening Steel Coating

Qin,

Chen,

Zhang

et al. 2024

J. Phys.: Conf. Ser.

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“…In order to achieve good mechanical properties (strength, ductility, fracture toughness, and fatigue crack propagation resistance), fine-grain tempered martensite microstructures is required for LAM UNS K92580 steel. [24][25]29 In comparison to wrought UNS K92580 steel, LAM UNS K92580 steel has a similar size and morphology of prior-austenite grain and graininterior martensite packet/block/plate, but both MC and M 2 C carbides have slight differences. It should be noted that fine rod-like M 2 C carbides in LAM UNS K92580 steel have lengths of 6 nm to 10 nm and diameters of 1 nm to 2 nm with average stoichiometric composition of (Cr 0.63 Mo 0.27 Fe 0.10 ) 2 C, 24 but in the wrought condition of UNS K92580 steel, M 2 C carbides have a length of 6 nm to 10 nm and diameter of 3 nm to 5 nm with average stoichiometric composition of (Cr 0.75 Mo 0.12 Fe 0.13 ) 2 C. 26 Changes in alloying elements in carbides such as C-rich and Fe-poor coherent M 2 C carbides decrease the elastic strain energy and can prompt the formation of semi-or incoherent interfaces for carbides.…”

Section: Science Sectionmentioning

confidence: 99%

“…21,24 However, after proper post strengthening and toughening heat treatments, LAM UNS K92580 steel can achieve improved tensile mechanical properties, fracture toughness, and fatigue crack propagation resistance due to microstructure optimization (including grain refinement, reduction of retained austenite, dissolution of M 3 C carbides, and dispersive precipitation of coherent M 2 C carbides). [20][21][24][25][26][27][28] It has been noted that microstructure optimization caused by heat treatment can change the type, amount, and distribution of hydrogen trap sites, and thus can influence the hydrogen diffusion behavior and embrittlement susceptibility of the steel. 15,[29][30] Although a recent review describes the effect of the additive manufacturing (AM) process on corrosion behavior, 31 relatively little information is available on HE or HEAC of AM materials.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Diffusion and Trapping in Laser Additively Manufactured Ultra-High Strength AerMet100 Steel

et al. 2021

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Hydrogen trapping and the permeation behavior of laser additively manufactured (LAM) AerMet100 steel with an as-deposited specimen (AD) and after three types of heat-treated specimens (BM, TBMM, and TM) was investigated. At least three types of different hydrogen traps were identified in each microstructure of LAM AerMet100 steel, including both reversible and irreversible H traps. For as-deposited microstructure, the main reversible H trap states are related to the precipitation of M3C carbides associated with a detrapping activation energy (Ed) of 17.3±0.2 kJ/mol. After heat treatment, the dominant reversible hydrogen trap states in the tempered martensite microstructure have a different Ed value of 19.3±0.5 kJ/mol, which is attributed to the precipitation of highly coherent M2C carbides. In comparison with the reported Ed value of ~21.4 kJ/mol for main reversible hydrogen traps in wrought AerMet100 steel, the less Ed value in LAM AerMet100 steel is closely related to the composition change of M2C carbides. In all of the H pre-charged samples, the diffusible and total H concentration of the TM specimen and the TBMM specimen are about 3-4 times higher than that of the AD specimen and the BM specimen. The TM specimen with tempered martensite microstructure has the highest diffusible and total H concentration due to its high density of dominantly reversible H traps. The effective hydrogen diffusion coefficient (Deff) of LAM AerMet100 steel is on the order of 10-9 cm2/s, and decreases with increasing density of dominantly reversible H traps brought about by heat treatment. Furthermore, compared with wrought AerMet100 steel of a similar yield strength (~1750 MPa), the LAM AerMet100 steel has a comparable Deff of about 2.8×10-9 cm2/s.

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Effect of Electroslag Remelting on the Microstructure and Ballistic Penetration Characteristics of an Austenite‐Based Lightweight Steel

Zhang,

Wang,

et al. 2024

steel research int.

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Herein, the effects of electroslag remelting (ESR) and impurities in ESR slag on the composition, microstructure, and properties of lightweight steel with a nominal composition in wt% of Fe‐20Mn‐10Al‐1.5C are studied. These results can provide a reference for the production of such steels using ESR and the design of the composition of such steels. The results show that ESR can make the contents of Si increase and that of S decrease, make the grain size decrease, make the phase transformation of austenite at about 540 °C change from spinodal decomposition to ordered transformation, make the contents of MnS and SiO2 and inclusions greater than 5 μm decrease, make the distribution of inclusions homogenize, and make the shape of inclusions change from long strip with sharp corners to spherical shape. ESR can improve its strength, plasticity, and antiballistic penetration properties.

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Effect of ordered domains on the fracture toughness of high Co-Ni secondary hardening steel

Cited by 12 publications

References 10 publications

Effect of Post-heat Treatment on Microstructure and Mechanical Properties of Laser Cladded High Co-Ni Secondary Hardening Steel Coating

Effect of Post-heat Treatment on Microstructure and Mechanical Properties of Laser Cladded High Co-Ni Secondary Hardening Steel Coating

Hydrogen Diffusion and Trapping in Laser Additively Manufactured Ultra-High Strength AerMet100 Steel

Effect of Electroslag Remelting on the Microstructure and Ballistic Penetration Characteristics of an Austenite‐Based Lightweight Steel

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