Naslov
Distribution of residual stress during straightening of cold drawn tube.

Autori
Novosel-Radović, Vjera ; Radović, Nikol ; Hrvatov-Crljenica, Nada

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

Izvornik
Materials structure in chemistry, biology, physics and technology / Kužel, Radomir ; Lhotka, Jaroslav ; Dobiašova, Ludmila - Prag : Czech and Slovak Crystallographic Association, 1998

Skup
XVIII. european crystallographic meeting

Mjesto i datum
Prag, Češka Republika, 15.08.1998. - 20.08.1998

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
residual stress; cold drawn tube; wall thickness; bar straightener

Sažetak
In practical manufactoring conditions, it is assumed that the residual stress present can be either removed or uniformly distributed across the tube wall thickness by applying additional annealing and straightening treatments. To verify this hypothesis residual stresses across the wall thickness were measured in finished rolled tube, a link, a finished rolled tube that had been dead annealed at 760 C in a RD - DR 1900/600 type Nassheur furnace in stream of protective gas (air + max. 4 percent of H2 + CO mixture) and in finished rolled tube that had been annealed and straightened on a bar straightener with three pairs of hyperbolic rollers. Samples for analysis were pieces of a tube /link which were successively removed as 1 mm thick layers and mounted on a specimen holder specifically built for the purpose. Before measurement the sample surface was prepared by grinding with a rough/ fine abrasive paper and by etching. The x-ray diffraction patterns were collected by means of the back reflection method. The x-ray powder patterns obtained were analysed visually and by the method of Warren and Averbach.The results of investigation pointed to a decrease in residual stress in the streightened tube/link in comparison with that in the finished rolled tube.

Izvorni jezik
Engleski

Znanstvena područja
Metalurgija

POVEZANOST RADA