Abstract
An experimental investigation on the workability behaviour of sintered Fe-0. 35C steel preforms under cold upsetting, have been studied in order to understand the influence of aspect ratio and lubrication condition on the workability process. The above mentioned powder metallurgy sintered preform with constant initial theoretical density of 84% of different aspect ratios, namely, 0. 4 and 0. 6 respectively were prepared using a suitable die-set assembly on a 1 MN capacity hydraulic press and sintered for 90 min at 1 200°C. Each sintered preform was cold upset under nil/no and graphite frictional constraint, respectively. Under the condition of triaxial stress densification state, axial stress, hoop stress, hydrostatic stress, effective stress and formability stress index against axial strain relationship was established and presented in this work. Further more, attained density was considered to establish formability stress index and various stress ratio parameters behaviour.
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Abbreviations
- D 0 :
-
Initial diameter of perform
- D b :
-
Forged bulged diameter of preform
- D c :
-
Forged contact diameter of preform
- f:
-
Load
- h 0 :
-
Initial height of preform
- h f :
-
Forged height of preform
- R:
-
Relative density
- R 0 :
-
Initial relative density
- S:
-
Contact surface area
- ε θ :
-
True hoop strain
- ε z :
-
True axial strain
- σ z :
-
Axial stress
- σ θ :
-
Hoop stress
- σ r :
-
Radial stress
- σ eff :
-
Effective stress.
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Narayan, S., Rajeshkannan, A. Workability Studies in Forming of Sintered Fe-0. 35C Powder Metallurgy Preform During Cold Upsetting. J. Iron Steel Res. Int. 18, 71–78 (2011). https://doi.org/10.1016/S1006-706X(12)60012-0
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DOI: https://doi.org/10.1016/S1006-706X(12)60012-0