Naslov
The influence of niobium precipitates in the cold drawing pipe

Autori
Rešković, Stoja ; Balenović, Marijan ; Jandrlić, Ivan ; Brlić, Tin

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, prošireni sažetak, znanstveni

Izvornik
Conference proceedings METAL 2019 / Different Authors - Ostrava, 2019, 102-102

ISBN
978-80-87294-91-8

Skup
28th International Conference on Metallurgy and Materials - METAL 2019

Mjesto i datum
Brno, Češka Republika, 22.05.2019. - 24.05.2019

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
niobium microalloyed steel, cold drawing tube, Lüders band, thermography, digital image cholera

Sažetak
The paper presents the results of the investigation of the influence of the microalloying element niobium at the beginning of the plastic material flow in the cold drawing of the tubes. Studies were conducted on low carbon steel and steel of the same base composition that was micro-alloyed with 0, 046% niobium. The steel strip of 370x3, 00 mm is made of both steel. Longitudinally welded tubes of 57 mm diameter and 3 mm wall thickness were made from the strip. Tubes were cold drawn to a diameter of 42 mm and wall thickness 2 mm. The tubes of both steel are cold drawing by the same parameters. The resulting results show different material behavior at the beginning of cold drawing. In the case of steel containing niobium at the beginning of cold deformation, Lüders bands appear. This phenomenon has not been noted for niobium-containing steel. Detailed structural tests have confirmed the appearance of Lüders bands in micro-alloyed steels. It has been found that niobium-containing steel occurs after non-homogeneous deformation after reaching the proportionality limit. Methods of thermography and digital image choleraeum confirmed that in the area of non- homogeneous deformations the appearance and propagation of Luders lines occurs. Only when it completes the propagation of the Lüders bands through the zone of deformation begins and the plastic deformation takes place. These changes have not been noted for niobium-containing steel.

Izvorni jezik
Engleski

Znanstvena područja
Metalurgija

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