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The impact of microstructural non-conformities on microhardness of EN AW 5754 aluminium alloy welded joints made with the use of the TIG method

(beam welding excluded) – Quality levels for welding non-conformities]. 8. PN-EN ISO 9015-2:2016-04, Badania niszczące złączy spawanych metali – Badanie twardości – Część 2: Badanie mikrotwardości złączy spawanych łukowo [Destructive tests of the welded metal joints – Hardness testing – Part 2: Microhardness testing of the arc-welded joints]. 9. Woźny P., Błachnio J., Quality requirements regarding aircraft maintenance and repair service. Research Works of Air Force Institute of Technology, No. 35, 2014. 10. Woźny P., Qualitative analysis of

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Surface condition, microstructure and microhardness of boronized layers produced on Vanadis-6 steel after modification by diode laser

.S., Ucar N., Effect of boronizing on microhardness and wear resistance of steel AISI 1050 and chilled cast iron. Metal Science and Heat Treatment, 56 (2014) 89 - 92. [5] Muhammad W., Boriding of high carbon high chromium cold work tool steel. IOP Conference Series: Materials Science and Engineering, 60 (2014) 1-6. [6] Jurči P., Hudáková M., Diffusion boronizing of H11 hot work tool steel. J. Mater. Eng. Perform. 20 (2011) 1180-1187. [7] Balandin Yu. A., Boronitriding of die steels in fluidized bed. Metal Science and Heat

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Examination of the Structure and Micro-Hardness of a Laser-Constituted Surface Layer Deposited on the Constructional Steel

Examination of the Structure and Micro-Hardness of a Laser-Constituted Surface Layer Deposited on the Constructional Steel

The paper has been intended to present results of the micro- and macroscopic examination of the structure, as well as measurements of micro-hardness of surface layers of specimens made from the toughening (heat-treatable) constructional steel 50H subjected to laser hardening. Basing on X-ray examination with the DRON-4 and the Seifert XRD 3003 diffractometers, parameters of crystalline lattice and quantitative contents of particular phases have been found.

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Microstructure and selected properties of boronized layers produced on C45 and CT90 steels after modification by diode laser

-Popowska D., Bartkowska A., Wpływ borowania dyfuzyjnego na mikrostrukturę i wybrane właściwości stali konstrukcyjnej. Journal of Research and Applications in Agricultural Engineering, 1 (2013) 147-150. [5] Uslu I., Comert H., Ipek M., Ozdemir O., Bindal C., Evaluation of borides formed on AISI P20 steel. Materials and Design, 28 (2007) 55 - 61. [6] Calik A., Simsek M., Karakas M.S., Ucar N., Effect of boronizing on microhardness and wear resistance of steel AISI 1050 and chilled cast iron. Metal Science and Heat Treatment, 56 (2014) 89 - 92

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Statistical Analysis of Results Obtained in the Hardening Surface of the Metal Powder Materials with Optical Radiation Impulses

“. Buletinul ştiinţific nr. 2 (32), (Sibiu, 2011):178-182. Virca, I. „Experimental studies on roughness and microhardness determination of some sintered parts, superficially treated with the optical radiation impulse“. Revista Academiei Forţelor Terestre, vol XV, nr. 4 (60), (Sibiu, 2010): 495-502. Virca, I. „The study of process sizes determining the durification of the sintered pieces with pulsed optiques radiations“, Revista de tehnologii neconvenţionale nr. 1, (Timişoara, 2004): 83-84. Virca, I. “The analyze of the final

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The Selected Measurement Problems in the Aspect of the Non-Destructive Testing of the Gear Wheels and the other Parts

of eddy current and microhardness methods. [in Polish]. Przegląd Spawalnictwa 3 (2014), 11-17. 7. Dybiec M., Nakonieczny A., Włodarczyk S.: Practical application of eddy current method for estimation of value and direction of stresses. NDT in antiquity and nowadays skills - applications - innovations, Hellenic Society of NDT, Chania - Crete, Greece, 2003, 109-113. 8. Babul T., Dybiec Cz., Jończyk S., Włodarczyk S.: Eddy current assessment of the stress caused by the penetration of hydrogen. [in Polish]. Inżynieria Powierzchni 2 (2013

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Comparative Study of Wear Resistance of the Composite with Microhybrid Structure and Nanocomposite

Abstract

The aim of the study was to compare microhardness and wear resistance of ceramic-polymer composites with micro and nano-hybrid structure. For the studies commercial composites were used, containing filler particles of the same type but different sizes, nano-sized (Filtek Ultimate) and micro-sized (Filtek Z250) composites. Tribological testing was conducted using ball-on-disc micro-tribometer. Vickers testing method was applied for microhardness studies with the use of Futertech FM 700 device. It has been demonstrated that the wear of Filtek Ultimate is almost twice lower in comparison to wear of Filtek Z250 composite. It has been concluded that the use of filler nanoparticles significantly increased wear resistance of the material. Additionally, lack of correlation between material microhardness and wear resistance has been demonstrated.

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Investigation on nonlinear optical and dielectric properties of L-arginine doped ZTC crystal to explore photonic device applications

. Hitherto, not a single researcher has reported the influence of LA on TONLO properties of ZTC crystal. This short communication is aimed to investigate the spectroscopic, mechanical, SHG efficiency and third order nonlinear optical and dielectric properties of 1 wt.% LA doped ZTC (LA-ZTC) crystal using SEM, EDS, microhardness, Kurtz-Perry SHG test, Z-scan and dielectric characterization techniques to explore the integrated optics and photonic device applications. Fig. 1 Photograph of LA-ZTC crystals. 2 Experimental The pure ZTC complex has been

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Effect of heat treatment on microstructure, microhardness and corrosion resistance of ZE41 Mg alloy

Abstract

Magnesium and its alloys are now attracting a great attention as promising materials for several light weight engineering applications. ZE41 is a new Mg alloy contains Zinc, Zirconium and Rare Earth elements as the important alloying elements and is widely used in aerospace applications. In the present study, heat treatment has been carried out at two different temperatures (300 and 335 °C) to assess the effect of heat treatment on microstructure and corrosion behavior of ZE41 Mg alloy. The grain size was observed as almost similar for the unprocessed and heat treated samples. Decreased amount of secondary phase (MgZn2) was observed after heat treating at 300 °C and increased intermetallic phase (Mg7Zn3) and higher number of twins appeared for the samples heat treated at 335 °C. Microhardness measurements showed increased hardness after heat treating at 300 °C and decreased hardness after heat treating at 335 °C which can be attributed to the presence of higher supersaturated grains after heat treating at 300 °C. The samples heat treated at 335 °C exhibited better corrosion resistance compared to those of base materials and samples heat treated at 300 °C. From the results, it can be understood that the selection of heat treatment temperature is crucial that depends on the requirement i.e. to improve the microhardness or at the loss of microhardness to improve the corrosion resistance of ZE41 Mg alloy.

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Surface Layer Properties of Low-Alloy High-Speed Steel after Grinding

Abstract

Investigations of the surface layer characteristics of selected kinds of low-alloy high-speed steel after grinding were carried out. They were carried out on the flat-surface grinder with a 95A24K grinding wheel without cooling. The influence of grinding parameters was defined especially for: the quantity of secondary austenite, surface roughness, microhardness and grinding efficiency with a large range of grinding parameters: grinding depth 0.005–0.035 mm, lengthwise feed 2–6 m/min, without a cross-feed on the whole width of the sample. It was found that improvement of grinding properties of low-alloy high-speed steels is possible by efficient selection of their chemical composition. The value of the grinding efficiency is conditioned by grinding forces, whose value has an impact on the grinding temperature. To ensure high quality of the tool surface layer (i.e. a smaller amount of secondary austenite, lack of wheel burn and micro-cracks) in the case of sharpening of tools made of low-alloy high-speed steel, the grinding temperature should be as low as possible.

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