Microstructure evolution modeling of square-diamond pass hot bar rolling of AISI 4135 steel

• Autorzy: Lee H. , Kwon H. , Im Y. , Hodgson P.

Warianty tytułu

PL

Modelowanie rozwoju mikrostruktury dla przepustu kwadrat-romb przy walcowaniu na gorąco prętów ze stali AISI 4135

• Języki publikacji: EN

Abstrakty

EN

In this study, kinetics of the static (SRX) and metadynamic recrystallization (MDRX) of AISI4135 steel was investigated using hot torsion tests. Continuous torsion tests were carried out to determine the critical strain for dynamic recrystallization (DRX). The times for 50% recrystallization of SRX and MDRX were determined, respectively, by means of interrupted torsion tests. Furthermore, austenite grain size (AGS) evolution due to recrystallization (RX) was measured by optical microscopy. With the help of the evolution model established, the AGS for hot bar rolling of AISI4135 steel was predicted numerically. The predicted AGS values were compared with the results using the other model available in the literature and experimental results to verify its validity. Then, numerical predictions depending on various process parameters such as interpass time, temperature, and roll speed were made to investigate the effect of these parameters on AGS distributions for square-diamond pass rolling. Such numerical results were found to be beneficial in understanding the effect of processing conditions on the microstructure evolution better and control the rolling processes more accurately.

PL

W pracy badano kinetykę statycznej (SRX) i metadynamicznej (MDRX) rekrystalizacji stali AISI4135 w próbie skręcania. Ciągłe próby skręcania wykonano w celu wyznaczenia krytycznych odkształceń dla dynamicznej rekrystalizacji (DRX). Czasy do 50% rekrystalizacji SRX i MDRX zostały wyznaczone w dwustopniowych próbach skręcania. Dodatkowo, zmiany wielkości ziarna austenitu (AGS) spowodowane rekrystalizacja były mierzone na mikroskopie optycznym. Stosując opracowany model ewolucji mikrostruktury, wyznaczona została wielkość ziania austenitu przy walcowaniu na gorąco prętów ze stali AISI4135. Wyznaczone wartości AGS został}1 porównane z wynikami otrzymanymi z dostępnego w literaturze modelu i z wynikami doświadczeń, które posłużyły do weryfikacji modelu. "Następnie określono wpływ takich parametrów jak czas przerwy, temperatura i prędkość walcowania na rozkład AGS przy walcowaniu w układzie przepustów kwadrat-romb. Wyniki numerycznej symulacji ułatwiły zrozumienie wpływu warunków procesu na rozwój mikrostruktury i bardzie] dokładne sterowanie procesem stało się możliwe.

Słowa kluczowe

EN

austenite grain size; recrystallization; hot bar rolling; numerical prediction; AISI4135

• Wydawca: Wydawnictwa AGH
• Czasopismo: Computer Methods in Materials Science
• Rocznik: 2006
• Tom: Vol. 6, No. 3-4
• Strony: 140--149
• Opis fizyczny: Bibliogr. 28 poz., rys.

Twórcy

autor

Lee H.

autor

Kwon H.

autor

Im Y.

autor

Hodgson P.

• National Research Laboratory for Computer Aided Materials Processing, Department of Mechanical Engineering, School of Mechanical, Aerospace & Systems Engineering, ME 3227, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea

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