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Microstructure and Properties of Composite Produced by Vacuum Sintering of Vanadis 4 Extra Steel Powder with Tantalum Carbides and Following Heat Treatment

Huang Kuo-Tsung, Chang Shih-Hsien, Chuang Chan-Yu

Archives of Metallurgy and Materials

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2020

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Vol. 65, iss. 2

555--563

EN

In this study, different amounts of tantalum carbide (TaC) powders (5, 10 and 15 wt.%) are added to Vanadis 4 Extra steel powders. The composite powders are sintered at 1260, 1280, 1300, 1320, 1340 and 1360°C for 1 h, respectively. The experimental results showed that good mechanical properties (hardness 79.7 HRA, TRS 2246 MPa) were obtained by the addition of 10% TaC sintered at 1320°C for 1 h. Furthermore, the optimal sintered V4ES/TaC (Vanadis 4 Extra steel / TaC) composites after sub-zero treatment possess the highest hardness (80.9 HRA) and transverse rupture strength (TRS) values (2445 MPa), as well as a better polarization resistance (658.99 Ω·cm2). After sub-zero treatment, the VC carbides decompose and re-precipitate refined VC carbides within the grains (VC carbides are formed in steel powder); moreover, the TaC particles are still uniformly distributed around the grain boundaries, which results in dispersion strengthening and precipitation hardening. The results clearly reveal that sub-zero heat treatment effectively improves the microstructure and strengthens the V4ES/TaC composite.

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Domieszkowanie warstwy wierzchniej cegły węglikiem tantalu za pomocą światła lasera rubinowego

Klemm K., Klemm P., Rożniakowski K.

Fizyka Budowli w Teorii i Praktyce

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2010

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T. 5, nr 3

21-25

PL

W pracy przedstawiono charakterystyczne wyniki badań domieszkowania warstwy wierzchniej cegły pochodzącej z obiektów zabytkowej Łodzi przemysłowej. Proces domieszkowania przeprowadzono za pomocą światła lasera rubinowego pracującego w układzie generacji swobodnej. Jako substancji domieszkującej użyto węglika tantalu w postaci proszku. Zaobserwowano w obszarze laserowego oddziaływania obszary w których węglik tantalu został wtopiony w warstwę wierzchnią a także obszary, w których występuje zjawisko laserowego platerowania.

EN

The work presents the results of experimental examinations of the chemical composition of the brick samples (covered of tantalum carbide) before laser beam interaction. The samples are genesis from Łódź old age buildings, placed Wólczańska 215 street. The electron microscopy (SEM) end Energy Dispersive X-ray methods were used. Large differences between chemical composition of the surface layer melted by laser beam and before laser exposition were observed.

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Structure and properties of surface layer of hot-work tool steels alloyed using high power diode laser

Dobrzański L. A., Jonda E., Labisz K.

Journal of Achievements in Materials and Manufacturing Engineering

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2009

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Vol. 37, nr 2

617-621

EN

Purpose: In this paper the results of remelting and alloying laser parameters on the structure and properties of the surface layer of the X40CrMoV5-1 and 32CrMoV12-28 hot work tool steels, using the high power diode laser (HPDL) are presented. Design/methodology/approach: The effect was determined of the main alloying parameters on hardness, abrasive wear resistance and roughness. The hot work tool steels conventionally heat treated were used as reference material and the tantalum carbide was used as an alloying material. The remelted layers which were formed in the surface of investigated hot work tool steels were metallographically examined and analyzed using a hardness testing machine. Findings: It was found out in examinations of the surface layer that it can be possible to obtain high quality top layer with higher hardness and abrasive wear resistance compared to material after conventional heat treatment. Research limitations/implications: The surface layer and its properties are elements which are critical for lifetime of tools and parts of machines and also for lifetime of whole technical equipment. If the working surface of a tool or its part is exposed to rough friction, an intensive mass and volume loss occurs. In this case it is reasonable to produce a surface layer which is extremely wear resistant to avoid the mass and volume loss. Originality/value: The research results of this type of heat treatment show that there is a possibility of applying the worked out technology to manufacturing or regeneration of chosen hot working tools.

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Laser surface treatment of the hot work tool steel alloyed with TaC and VC carbide powders

Dobrzański L. A., Jonda E., Klimpel A.

Archives of Materials Science and Engineering

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2009

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Vol. 37, nr 1

53-60

EN

Purpose: The paper presents investigation results of the structure and properties of alloying surface layer of the X40CrMoV5-1 hot work tool steel, using the high power diode laser HPDL. Tantalum and vanadium carbides powders were used for alloying and the X40CrMoV5-1 conventionally heat treated steel was used as reference material. Design/methodology/approach: Metallographic examinations of the material structures after laser alloying surface layer were made on light microscope and transmission electron microscope. The resistance research has been done with the use of the pin-on-disc method. Hardness tests were made with Rockwell method in C scale. Findings: It was found out in examinations of the surface layer that it can be possible to obtain high quality top layer with better properties compared to material after a standard heat treatment. Research limitations/implications: In this research two powders (TaC and VC) were used for alloying of the surface layer of investigated steel. Practical implications: The structure as well as improvement of mechanical properties is a practical aim of this work as well as improvement of hardness as a very important properties for practical use. Originality/value: The research results of this type of heat treatment show that there is a possibility of applying the worked out technology to manufacturing or regeneration of chosen hot working tools.