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Novel drawing technology for high area reduction manufacturing of ultra-thin brass wires

Kustra Piotr, Wróbel Mirosław, Dymek Stanisław, Milenin Andrij

Archives of Civil and Mechanical Engineering

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2023

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Vol. 23, no. 3

art. no. e144, 2023

EN

A significant increase in roughness of dieless-drawn wires due to the strain-induced roughness phenomenon has been documented. For small-diameter wires, even a slight surface relief creates stress concentrations that may contribute to the wire breakage during cold drawing. This, in turn, significantly limits the achievable diameter of the product and the efficiency of drawing process. The present study, however, demonstrates that reducing the wire roughness is possible by combining the dieless and conventional drawing methods. Thus, it is possible to improve the process workability threefold when compared to dieless drawing alone, and the product quality is simultaneously improved. In addition, the surface defects typical to the dieless-drawn wires have been significantly reduced, resulting in an increase in the wire strength. This new combined technology enables a significant reduction in the wire diameter and facilitates an economical large-scale production of ultra-thin wires. In addition, based on the classic drawing and dieless drawing process, a brass wire with a diameter of 0.017 mm has been manufactured. Six times thinner than a human hair, it is believed to be the thinnest long brass wire currently manufactured in the world.

2

Microstructure of 309 and 310 Austenitic Stainless Steel CMT Overlays on the 16Mo3 Pressure Vessel Steel

Rozmus-Górnikowska Magdalena, Dymek Stanisław, Blicharski M., Cieniek Łukasz, Kusiński Jan

Archives of Metallurgy and Materials

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2021

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Vol. 66, iss. 2

645--649

EN

The aim of this work was to characterize the changes in microstructure and chemical composition of the austenitic overlays on a pressure vessel steel that occur in the vicinity of the interface between the overlay and the base material. The investigations were carried out on a 16Mo3 boiler pipes weld overlaid by 309 and 310 steels. The microstructural examinations were performed on longitudinal cross-sectioned samples. The qualitative and quantitative chemical composition analyses on metallographic samples were determined on Scanning Electron Microscopy (SEM) by means of Energy Dispersive Spectrometry (EDS). The article analyzes the influence of the solidification sequence in both types of steel on final microstructure.

3

Mikrostruktura złącza spawanego

Blicharski Marek, Dymek Stanisław

Hutnik, Wiadomości Hutnicze

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2019

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Vol. 86, nr 4

108--116

PL

Mikrostruktura złącza spawanego cechuje się bardzo dużą niejednorodnością na jego przekroju, a ponadto jest zależna od materiału spawanego, użytego spoiwa oraz od zastosowanej metody i warunków spawania. Ze względu na dużą różnorodność materiałów spawanych oraz parametrów spawania w artykule przedyskutowano tylko podstawowe zasady tworzenia się mikrostruktury spoiny. Szczególną uwagę zwrócono na redystrybucję pierwiastków rozpuszczonych oraz na kształt i stabilność frontu krystalizacji podczas krzepnięcia spoin. Scharakteryzowano poszczególne strefy złącza spawanego oraz omówiono szczegółowo czynniki wpływające na mikrostrukturę spoiny oraz strefy wpływu ciepła.

EN

Weld microstructure observed on the weld cross-section is highly inhomogeneous and depends on joined materials, filler metals, welding methods as well welding conditions. Due to large variety of welded materials and applied welding parameters the paper discusses only the basic principles that govern the evolution of microstructure during welding. In particular, the redistribution of alloying elements during solidification as well as the shape and stability of the crystallization front were addressed in detail. Also, particular regions of weld were described in a thorough manner with an emphasis on factors influencing the weld microstructure.