Transformations of dislocation martensite in tempering secondary-hardening steel

Gorynin, I. V.; Рыбин, В. В.; Malyshevskii, V. A.; Semicheva, T. G.; Sherokhina, L. G.

doi:10.1007/bf02469875

Cited by 12 publications

(4 citation statements)

References 2 publications

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“…However, a significant increase in the volume fraction of molybdenum carbides is observed when cobalt is associated with molybdenum: 0.68% compared with 0.45% for the MoMo grade (Table 4). The complex effect of cobalt on the dislocations structure and consequently on the density and nature of nucleation sites of precipitation has already been investigated and reported in the literature [6,8,[19][20][21] and will not be discussed further on in this paper. Nickel addition significantly decreases the volume fraction of the first population.…”

Section: Volume Fraction Of Small Carbidesmentioning

confidence: 99%

The effect of the addition of alloying elements on carbide precipitation and mechanical properties in 5% chromium martensitic steels

et al. 2007

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Carbide-forming elements (W, Mo, Nb, V), as well as elements that influence only the tempering kinetics (Co, Ni), were added to a 5% Cr tempered martensitic steel in order to modify its precipitation. The main goal was to shift the secondary hardening peak towards higher tempering temperatures. Small angle neutron scattering and X-ray diffraction experiments, as well as transmission electron microscopy, were performed to characterize the precipitation of nanometric carbides. A significant modification of the volume fraction and/or chemistry of the very fine secondary precipitation was observed only for Mo, V and Ni additions. Moreover, the mechanical properties showed that the volume fraction of small precipitates (VC, Fe 3 Mo 3 C) directly influences the mechanical resistance at high temperature but has a detrimental effect on Charpy impact energy.

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Section: Volume Fraction Of Small Carbidesmentioning

confidence: 99%

The effect of the addition of alloying elements on carbide precipitation and mechanical properties in 5% chromium martensitic steels

et al. 2007

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“…It is well known that the quenching specimens shows a high dislocation density and as well as the hot-stamped specimens [6], while the lower dislocation density, together with the presence of nano-carbides, distinguishes the tempered specimens. The annihilation of dislocations during tempering treatment has been indicated by Gorynin et al [7]. The increase of yield strength after tempering treatment can be related to the effect of carbide strengthening.…”

Section: Results and Discussion For Tempering Treatmentmentioning

confidence: 85%

Non-Isothermal Resistance Heating for Hot-Stamped Parts with Tailored Properties and Tempering Treatment on Directly Hot-Stamped Parts

Sun

Zhang

2014

AMR

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Non-isothermal resistance heating in the hot stamping of quenchable steel sheets was developed to produce ultra-high strength steel formed parts with tailored properties. The heating temperature of parts is related with width of samples heated by resistance heating. With the same input energy, the strength in the narrow portions is high owing to the high energy density and that in the wide portions is low owing to the low energy density. Hat-shaped products having a tensile strength arrange from 600 MPA to 1800 MPa were formed. The tempering treatment on the directly hot-stamped boron steel resulted in better mechanical properties and higher formability index. The SEM figures indicates that the nano-carbide formation during the tempering treatment were suggested as the evident reasons for the occurrence of the mentioned robust properties. Finally the combination of temperature 250 ℃ and holding time 45 min can achieve the best comprehensive mechanical properties.

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“…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). This is because many dislocations exited in the carbon-supersaturated matrix of the laser cladded high Co-Ni steel coating, which offer the heterogeneous nucleation sites for the formation of M 2 C carbides [26,29]. Moreover, it is known that the relatively high post-heat-treatment temperature is able to greatly promote the carbon atoms to diffuse interstitially, which provides a sufficient thermodynamic driving force for the nucleation and growth of M 2 C carbides [16,29].…”

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

confidence: 99%

“…around 280 o C to 650 o C[25][26][27]. Obviously, the decomposition of retained austenite should depend on the holding time and temperature.…”

mentioning

confidence: 99%

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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Transformations of dislocation martensite in tempering secondary-hardening steel

Cited by 12 publications

References 2 publications

The effect of the addition of alloying elements on carbide precipitation and mechanical properties in 5% chromium martensitic steels

The effect of the addition of alloying elements on carbide precipitation and mechanical properties in 5% chromium martensitic steels

Non-Isothermal Resistance Heating for Hot-Stamped Parts with Tailored Properties and Tempering Treatment on Directly Hot-Stamped Parts

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

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