20 KB741 KB17 KB200020242013Ansaripour, AmirAsefi, DavodSalimi, AhmadrezaToroghinejad, Mohammad RezaZadeh, Hossein Monajatištevilka:3letnik:47str. 385-389COBISSID:1000106ISSN:1580-2949URN:URN:NBN:SI:doc-SXIIHIXUenInštitut za kovinske materiale in tehnologijeMateriali in tehnologijemikrolegirano jeklomikrostrukturaudarna žilavostInfluence of sample direction on the impact toughness of the API-X42 microalloyed steel with a banded structure| Vpliv usmerjenosti vzorcev na udarno žilavost mikrolegiranega jekla API-X42 s trakavo mikrostrukturo|The layering of a microstructure parallel to the direction of the material flow during the hot working process is called banding. In the present paper, the severity of ferrite-pearlite banding in the API-X42 microalloyed steel and its effects on the impact energy are studied. Specifically, the impact toughness is examined in the cases of banded and non-banded samples along two directions, perpendicular and parallel to the rolling, and the obtained results are compared. Metallographic examinations, together with the Charpy impact tests at 0 °C and -18 °C, were done for both directions, parallel and perpendicular to the rolling. The results showed a dependence of the impact energy on the sample direction relative to the rolling to be larger with the banded than the non-banded sample. The difference between the impact energies for the directions parallel and perpendicular to the rolling was also noticed to be caused by the increasing anisotropy indexUsmerjanje mikrostrukture vzporedno s smerjo vročega preoblikovanja se imenuje trakavost. V članku je predstavljena študija preprostosti feritno-perlitnih pasov v mikrolegiranem jeklu API-X42 in njihov vpliv na udarno energijo. Specifično je primerjana udarna žilavost med vzorci s trakavo in netrakavo mikrostrukturo vzdolž dveh smeri, pravokotno in vzporedno s smerjo valjanja. Opravljene so bile metalografske preiskave in udarni preskusi Charpy pri 0 °C in -18 °C vzporedno in pravokotno na smer valjanja. Rezultati so pokazali odvisnost udarne energije glede na usmerjenost vzorca pri valjanju, relativno bolj v trakavih kot v netrakavih vzorcih. Pri naraščajočem indeksu anizotropije je bila opažena razlika med energijo udarca pri vzporedni in pravokotni smeri valjanjaTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije