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Інтелектуальні транспортні технології

Mon, 01 Jan 2024 00:00:00 GMT

Title: Інтелектуальні транспортні технології Abstract: Збірник містить тези доповідей науковців вищих навчальних закладів України та інших країн, підприємств транспортної та машинобудівної галузей за чотирьма напрямками: розвиток інтелектуальних технологій при управлінні транспортними системами; транспортні системи та логістика; інтелектуальне проектування та сервіс на транспорті; функціональні матеріали та технології при виготовленні та відновленні деталей транспортного призначення.

Mechanical properties of thick sheets of X70 API 5L grade steel produced from heavy slab

Mon, 01 Jan 2024 00:00:00 GMT

Title: Mechanical properties of thick sheets of X70 API 5L grade steel produced from heavy slab Authors: Efremenko, B.V.; Chabak, Yu.G.; Efremenko, V.G.; Mironenkova, D.A. Abstract: This work investigated the microstructure and mechanical properties of 40 mm thick sheets of low-carbon (0.06-0.07 wt.%C) (Cr, Ni, Mo, V, Nb)-micro-alloyed steel, produced from heavy slab in order to comply with the requirements of X70 (API 5L) grade. It was found that applying a heavy slab of increased thickness is feasible for the production of thick ( 30 mm) steel sheets intended for oil/gas pipelines. Using a 300 mm thick slab increases its rolling reduction by 12-36 % when producing 40 mm thick sheets which enabled the better deformation to eliminate the cast structure in the axis zone of the billet. This resulted in structure refining which enhances the lowtemperature impact behaviors (Charpy V-notch test, DWTT) of steel ensuring compliance with an X70 (API 5L) grade.

Enhancing abrasive wear resistance of hybrid multicomponent cast irons by high-temperature quenching

Mon, 01 Jan 2024 00:00:00 GMT

Title: Enhancing abrasive wear resistance of hybrid multicomponent cast irons by high-temperature quenching Authors: Chabak, Yu.G.; Efremenko, V.G.; Golinskyi, M.A.; Petryshynets, I.; Kudin, V.V.; Kalinichenko, A.S. Abstract: In this work, enhancing the tribological characteristics of the novel cast metallic materials – hybrid multi-component cast irons (MCCIs) – by applying a strengthening heat treatment is described [1, 2]. The experimental materials were the cast alloys of a nominal composition (5 wt.% W, 5 wt.% Mo, 5 wt.% V, 10 wt.% Cr, 2.5 wt.% Ti, Fe is a balance) added with 0.3-1.1 wt.% C and 1.5-2.5 wt.% B (total 9 alloys). Heat treatment was an oil-quenching followed by 200 oC-tempering. The quench temperature (QT) was varied in the range of 900-1200 oC with a step of 50 oC (with a 2-hour holding at QT). The correlation of QT with microstructure and properties was estimated using microstructure/worn surface characterization, differential scanning calorimetry, hardness measurement, and three-body-abrasive wear testing (using Al2O3 particles).

Surface hardening of 3D-printed Ti-6Al-4V alloy through complex treatment

Mon, 01 Jan 2024 00:00:00 GMT

Title: Surface hardening of 3D-printed Ti-6Al-4V alloy through complex treatment Authors: Efremenko, B.V.; Chabak, Yu.G.; Efremenko, V.G.; Balalayeva, E.Yu.; Tsvetkova, E.V.; Simonov, A.A. Abstract: The object of this work is a study of the microstructure and hardness evolution of LPBF-manufactured biomedical alloy Ti-6Al-4V superficially modified by pack carburization and subsequent laser melting [1]. Ti-6Al-4V alloy specimens of 5x10x25 (mm) in size were fabricated by Laser Powder Bed Fusion process using a “ProX DMP 320” (3D Systems) equipment with a 500 W fibre laser (1070 nm wavelength, 0.5 mm beam diameter). The powder feedstock (particle size is 39±3 μm) was an EOS Titanium Ti64ELI powder of nominal chemical composition (wt. %): Al (5.5-6.75), V (3.5-4.5), O < 0.2, N < 0.05, C < 0.08, H < 0.015, Fe < 0.3, Ti - balance.