Prerna Aggarwal, Alok Srivastava and M. L. Singla
Accepted Abstracts: J Material Sci
In this work, the two hot working constitutive equation models to predict (a) the flow stresses based on Fourier series and (b) to predict the industrial loads are proposed. Results show that there is a good correlation between the predicted (MFS, roll force and the Z parameter) and the actual values from the mill logs. The multipass hot working behavior of stainless steel type AISI 321 was simulated through Gleeble simulated thermomechanical processing where the deformation temperature was varied between 800 0 C and 1200 0 C and the strain rate was also varied between 0.001/s and 5/s. The effect of hot rolling parameters such as strain, strain rate, and temperature were investigated. It was observed that at strain rates greater than 0.05s -1 , dynamic recovery as a restoration mechanism was dominant pushing the dynamic recrystallisation to dynamic recovery transition temperature (DR TT ) to higher temperatures. This implied, through extrapolation, that at typical industrial strain rates of about 60s -1 no dynamic recrystallization occurs but dynamic recovery. It was also found that when the interpass time (T ip )is increased to 20s at a strain rate of 0.01/s , the DR TT was found to be 969 0 C and when T ip was reduced to 2s, the DR TT was found to be 959 0 C at the same strain rate. Keywords: Dynamic recrystallization (DRX), Dynamic recovery (DRV), Constitutive equation, Mean flow stress (MFS), Dynamic recrystallization to dynamic recovery transition temperature (DR TT ).
Richard K. C. Nkhoma is a Ph.D. student at the University of Pretoria in the field of Physical Metallurgy. He did his B.Sc. in Malawi and his B.Sc. (Hons) and M.Sc. was done at the University of Pretoria. His background is in mechanical engineering.
Journal of Material Sciences & Engineering received 3677 citations as per Google Scholar report
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