| Autor: |
Bernik, Matic, Gregori, Noel, Foder, Jan, Bradaškja, Boštjan, Šuštarič, Primož, Šuštar, Tomaž, Zgonc, Dejan |
| Předmět: |
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| Zdroj: |
Materials & Technologies / Materiali in Tehnologije; Sep/Oct2023, Vol. 57 Issue 5, p96-96, 1p |
| Abstrakt: |
Prior austenite grain size (PAGS) of hot rolled quarto plates has major influence on final mechanical and workshop properties of structural steels, either in as-rolled or in off-line quenched and tempered condition. Thus, it is of great importance to obtain fine and evenly distributed PAGS after the rolling, which is related to the plate thickness. To evaluate the effect of plate thickness on through-thickness PAGS distribution of industrial hot-rolled structural quarto plates, PAGS distribution was determined in thickness range from 10 to 85 mm. PAGS in as-rolled condition was evaluated using manual method on micrographs obtained on scanning electron microscope, considering at least 400 grains in longitudinal direction in 5 positions across the thickness profile. The results confirm that the plate thickness majorly affects the through-thickness distribution, as also the average and maximum PAGS. Coarser grains and wider distribution can be linked to the limited total reduction ratio for thicker plates which is related to the partial static recrystallization during the passes, which is further related to the through-thickness thermo-mechanical conditions. Thus, a fully implicit finite element thermo-mechanical model was used to calculate the through-thickness temperature, strain, and strain rate. The results of the thermo-mechanical model show temperature heterogeneity and limited through-thickness strains and strain rates, which can result in anisotropic and sluggish softening kinetics, producing coarser grains and wider PAGS distribution. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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