Microstructural and mechanical behavior of 4.5Cr–2W–0.25V–0.1C steel

Asadabad, Mohsen Asadi; Kheirandish, Shahram; Novinrooz, A. J.

doi:10.1016/j.msea.2009.10.042

Cited by 23 publications

(12 citation statements)

References 18 publications

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“…For 500°C-tempered samples, the thickness is 50 nm for all thin foils, while a thickness of 75 nm in the 5 h FIB thin foil was obtained. The difference in thickness between the middle of the measured precipitate and the surrounding matrix is less than 15% for all samples, and thus, EDS absorption correction can be applied to these measurements using the Cliff-Lorimer thin-film approach [38].…”

Section: Microstructure Characterizationmentioning

confidence: 99%

Early stages of cementite precipitation during tempering of 1C–1Cr martensitic steel

et al. 2019

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The precipitation of cementite (M 3 C) from as-quenched martensite during tempering at 500 and 700°C was investigated in a Fe-1C-1Cr (wt%) alloy. Tempering for a short duration at 700°C results in a Cr/Fe ratio in the core region of M 3 C precipitates which is equal to the bulk alloy composition, while a shell on the surface of the precipitates exhibits a higher Cr concentration. With a prolonged tempering up to 5 h, the shell concentration gradually increases toward the equilibrium value, but the core region has not yet reached the equilibrium value. After tempering for 5 s at 500°C, there is no Cr enrichment found at the M 3 C-matrix interface, while a transition to partitioning of Cr is found during the first 5 min of tempering at 500°C. These experimental results indicate that M 3 C grows without significant partitioning of substitutional elements at both temperatures initially, i.e., growth is carbon diffusion controlled. This stage is, however, very short, and soon after 5 s at 700°C and 5 min at 500°C, Cr diffusion becomes important. Calculations using the diffusion simulation software DICTRA and precipitation simulation software TC-PRISMA were performed. The diffusion simulations using the local equilibrium interface condition show excellent agreement with experiments concerning Cr enrichment of the particles, but the size evolution is overestimated. On the other hand, the precipitation simulations underestimate the size evolution. It is suggested that a major improvement in the precipitation model could be achieved by implementing a modified nucleation model that considers nucleation far from the equilibrium composition.

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Section: Microstructure Characterizationmentioning

confidence: 99%

Early stages of cementite precipitation during tempering of 1C–1Cr martensitic steel

et al. 2019

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“…The Cr/Fe ratio of M 7 C 3 is larger than that of M 23 C 6 . M 23 C 6 has a higher stability in high Cr containing steels as compared to M 7 C 3 , but it is metastable and gradually replaced by M 7 C 3 during tempering when the Cr content is low . The research showed that improving Mo content could enhance the stability of M 23 C 6 even at lower Cr content .…”

Section: Resultsmentioning

confidence: 92%

“…M 23 C 6 has a higher stability in high Cr containing steels as compared to M 7 C 3 , but it is metastable and gradually replaced by M 7 C 3 during tempering when the Cr content is low. [22] The research showed that improving Mo content could enhance the stability of M 23 C 6 even at lower Cr content. [23] Therefore, M 23 C 6 is observed in steel A due to the addition of 0.8% Mo, and the EDS result also shows that there is some Mo in M 23 C 6 .…”

Section: Precipitates After Being Tempered For 1 Hmentioning

confidence: 94%

Effects of Nb and Tempering Time on Carbide Precipitation Behavior and Mechanical Properties of Cr–Mo–V Steel for Brake Discs

Wang

Cheng

et al. 2018

steel research int.

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To improve the performance of the steel for brake discs, like mechanical properties and thermal fatigue resistance, Nb is added to the steel. In this paper, the effects of Nb and tempering time on the microstructure and mechanical properties of the steel have been studied. The investigation of precipitation behaviors is based on Thermo‐Calc software and transmission electron microscopy. The results show there is a negative linear relationship between the yield strength and the logarithm of time, and tempering time should not exceed 2 h. V‐rich M8C7 and NbC occur during austenitizing, while (Mo,V)C, M23C6, and M7C3 precipitate during tempering. (Mo,V)C has a strong strengthening effect at the early stage of tempering, but it grows faster than M8C7. With 0.025% Nb addition, the yield strength and impact energy increase simultaneously due to the refinement of martensite; the addition of 0.045% Nb promotes the tempering stability due to the suppression of precipitation and coarsening of Cr carbides and the precipitation strengthening of M8C7 and NbC, therefore, the addition of 0.025–0.045% Nb is conducive to improving the performance of the steel. Moreover, the suppression of Cr carbides with 0.045% Nb addition makes up for the damage of large NbC to toughness.

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“…The volume fraction, size, morphology and distribution of precipitates have strong effects on the mechanical properties of steel materials [1]. Studies have shown that precipitation strengthening effect of small carbides can significantly improve the mechanical properties of steel [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Quantitative Analysis on Carbide Precipitation in V-Ti Microalloyed TRIP Steel Containing Aluminum

et al. 2016

MATEC Web Conf.

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Abstract. Introducing fine precipitates is an important way to enhance the properties of transformation-induced plasticity (TRIP) steels. In present work, two V-Ti microalloyed TRIP steels containing aluminum with different content were compared. The average size, size distribution and numbers of vanadium-titanium carbides in samples cold rolled, quenched after being held at 800°C and quenched after intercritical annealing at 800°C and being held at bainitic isothermal transformation temperature of 400°C were investigated by using the technique of carbon extraction replica, twin jet chemical polishing thinning and transmission electron microscopy. The carbides were identified to be (Ti,V)C precipitates in steel A and VC in steel B respectively, precipitated mainly from ferrites grains. The average equivalent radius was 3~6nm. Comparison of the experimental results in A and B steel revealed low carbon diffusion rate caused by aluminum inhibited the coarsening of vanadium-titanium carbides. The experimental results also showed that VC carbides dissolution occurred during the intercritical annealing at 800°C.

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Microstructural and mechanical behavior of 4.5Cr–2W–0.25V–0.1C steel

Cited by 23 publications

References 18 publications

Early stages of cementite precipitation during tempering of 1C–1Cr martensitic steel

Early stages of cementite precipitation during tempering of 1C–1Cr martensitic steel

Effects of Nb and Tempering Time on Carbide Precipitation Behavior and Mechanical Properties of Cr–Mo–V Steel for Brake Discs

Quantitative Analysis on Carbide Precipitation in V-Ti Microalloyed TRIP Steel Containing Aluminum

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