Microstructure, Mechanical Properties, and Thermal Stability of Carbon-Free High Speed Tool Steel Strengthened by Intermetallics Compared to Vanadis 60 Steel Strengthened by Carbides

Michalcová, Alena; Pečinka, Vojtěch; Kačenka, Zdeněk; Šerák, Jan; Kubásek, Jiří; Novák, Pavel; Vojtěch, Dalibor

doi:10.3390/met11121901

Cited by 8 publications

(5 citation statements)

References 27 publications

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“…The phase composition of coatings was confirmed by XRD, and the results are shown in Figure 7. The presence of VC and Fe9V in the coatings of both substrates was confirmed and can be identified through the XRD powder diffraction pdf card by numbers 01-073-0476 and 03-065-7509, respectively [53]. For the coating deposited onto the substrate with the highest dilution (12.5 mm), austenite was found (pdf card 00-052-0512).…”

Section: Microstructurementioning

confidence: 68%

The Effect of the Dilution Level on Microstructure and Wear Resistance of Fe-Cr-CV Hardfacing Coatings Deposited by PTA-P

et al. 2022

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Soil preparation tools are subject to severe abrasion. The wear resistance of various industrial components can be improved using the hardfacing technique. The improvement in hardfacing wear resistance depends on the microstructure, i.e., the chemical composition of the alloys, the method of overlay, and the parameters of the selected process. The Plasma Transferred Arc with Powder (PTA-P) welding process is interesting as a hardfacing technique since it promotes very low dilution of the substrate in the coating. In this article, the PTA-P welding process was used for the deposition of Fe-Cr-C-based hard coatings with the addition of vanadium onto cheap and relatively soft low-carbon steel substrates. Rubber-wheel abrasion tests were performed to compare the abrasion resistance between commercial anti-wear steel and weld-deposited Fe-Cr-C-V hard coatings. In addition, the microstructure, dilution, and wear mechanisms were investigated. The dilution of the coatings affected the microstructure, in particular, the free mean path of the vanadium carbides, but it only affected abrasion resistance when the wear mechanism involved rolling abrasion. The deposited coatings proved to be at least three times stronger than a commercial abrasion-resistant steel due to the distribution and morphology of the vanadium carbides formed in the coatings.

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Section: Microstructurementioning

confidence: 68%

The Effect of the Dilution Level on Microstructure and Wear Resistance of Fe-Cr-CV Hardfacing Coatings Deposited by PTA-P

et al. 2022

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“…The scientific and technical developments of new modifications of tool high-speed steels that have emerged in recent years strongly recommend increasing the cobalt content in steel, where it was not previously present in previous years' designs [20][21][22].…”

Section: Resultsmentioning

confidence: 99%

Cobalt application in repair tools for maintenance and modernisation of NPP equipment

Levchenko¹,

Pogosov²,

Kravchenko³

2023

Scientific Herald of Uzhhorod University Series Physics

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Relevance. The research discusses the actual risks that can arise from the formation of the radioisotope cobalt 60Co from the stable isotope 59Co during radiation neutron capture, which is specific to repair work at a nuclear power plant, but these risks are poorly understood. Aim. The research aims to analyse the possibility of additional exposure to ionising radiation for the repair personnel of a nuclear power plant due to the use of a repair tool that may contain cobalt. Methodology. The physical-theoretical and analytical approaches are used in the study. Results. A certain risk has been identified as a result of the use of drills or other tools for cutting metal containing cobalt among the repair tools. The calculation (analysis) of the activation of a cobalt-containing drill bit showed that a drill bit weighing 500 g containing 8% of 59Co in the tool steel acquires a partial activity (i.e., only cobalt activity) of 5.397 × 10-8 Ci, which leads to gamma radiation with an exposure dose rate of 0.024 mSv/year. The calculations of dose rates did not consider gamma radiation from the nuclear isomeric transition 60mCo→60Co, which could only worsen the radiation risk picture (when considering other examples). Conclusions. The use of a drill bit with the cobalt content specified in the calculations (or the location of the drill bit in the vicinity of the personnel), one way or another, contributes to the personnel exposure. It is proved that the calculation was not conservative, but rather liberal, because gamma radiation from the 60mCo isomer was not considered, otherwise, the obtained numerical values would have been higher. A practical recommendation to prohibit or reduce the use of tools containing cobalt during repairs on nuclear power plant equipment was made, theoretically, given that the analytically justified need to study the issue of radiation safety is relevant and vital for the safety of NPP maintenance personnel

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“…The traditional high-speed steels contain a high amount of carbon and other alloying elements with different functions. 1,2) Notably, Uddeholm Vanadis 60 is a high-alloyed, high-performance powder metallurgy (PM) high-speed steel with an addition of cobalt (10.5%). It is particularly suitable for cold work tooling where the highest wear resistance and compressive strength are required simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Microstructure, Strengthening Mechanism and Mechanical Properties of Vanadis 60-Ta0.5Nb0.5C-B4C High-speed Steel Composite via Vacuum Sintering, Sub-zero, and Heat Treatments

Huang,

Chang,

Chang

2024

ISIJ Int.

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This research added different ratios of Ta 50 Nb 50 C and B 4 C powders to Vanadis 60 high-speed steel powders, and then, sintered the Vanadis 60 composite from 1205 to 1225°C by vacuum sintering for 1 hour. Subsequently, a series of heat treatments were conducted, including quenching, sub-zero, and tempering processes. The study results show that the optimal sintering temperature and the additive ratio for Vanadis 60 composites were 1205°C and 0.975 mass% Ta 50 Nb 50 C-0.025 mass% B 4 C powders, respectively. Simultaneously, the transverse rupture strength (TRS) value was 2328.2±0.90.7 MPa and the hardness value was 81.3±0.1 HRA, respectively. In particular, when the optimally sintered Vanadis 60 composite underwent sub-zero plus heat treatments, the TRS and hardness values obviously increased to 2456.6±76.3 MPa and 85.7±0.3 HRA, respectively. Finally, the TEM and EBSD study results also revealed that various MC and M 6 C-type carbides significantly appeared in the Vanadis 60 composite after vacuum sintering and sub-zero plus heat treatments.

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Microstructure, Mechanical Properties, and Thermal Stability of Carbon-Free High Speed Tool Steel Strengthened by Intermetallics Compared to Vanadis 60 Steel Strengthened by Carbides

Cited by 8 publications

References 27 publications

The Effect of the Dilution Level on Microstructure and Wear Resistance of Fe-Cr-CV Hardfacing Coatings Deposited by PTA-P

The Effect of the Dilution Level on Microstructure and Wear Resistance of Fe-Cr-CV Hardfacing Coatings Deposited by PTA-P

Cobalt application in repair tools for maintenance and modernisation of NPP equipment

Microstructure, Strengthening Mechanism and Mechanical Properties of Vanadis 60-Ta<sub>0.5</sub>Nb<sub>0.5</sub>C-B<sub>4</sub>C High-speed Steel Composite via Vacuum Sintering, Sub-zero, and Heat Treatments

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