自然科学版 英文版
自然科学版 英文版
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中南大学学报(英文版)

Journal of Central South University

Vol. 15    No. 1    February 2008

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Prediction of grain size for large-sized aluminium alloy 7050 forging during hot forming
YI You-ping(易幼平)1, FU Xin(付 欣)1, CUI Jin-dong(崔金栋)1, CHEN Hua(陈 华)2

1.Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing, Ministry of Education, Central South University, Changsha 410083, China;2. Southwest Aluminum (Group) Co Ltd, Chongqing 401326, China

Abstract:A numerical approach for process optimization and microstructure evolution of lager-sized forging of aluminium alloy 7050 was proposed, which combined a commercial FEM code Deform 3D with empirical models. To obtain the parameters of empirical constitutive equation and dynamic recrystallization models for aluminium alloy 7050, the isothermal compression tests of 7050 samples were performed on Gleeble-1500 thermo-simulation machine in the temperature range of 250−450 ℃ and strain rate of 0.01−10 s−1, and the metallograph analysis of the samples were carried out on a Leica DMIRM image analyzer. The simulation results show that the dynamic recrystallization in the central area of the billet occurs more easily than that on the edge. Repetitious upsetting and stretching processes make the billet deform adequately. Among several forging processes e.g. upsetting, stretching, rounding and flatting, the stretching process is the most effective way to increase the effective strain and refine the microstructure of the billet. As the forging steps increase, the effective strain rises significantly and the average grain size reduces sharply. Recrystallized volume fractions in most parts of the final forging piece reach 100% and the average grain size reduces to 10 m from initial value of 90 m.

 

Key words: aluminium alloy 7050; grain size; forging; FEM simulation

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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