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Some aspects of workability studies on sintered high strength P/M steel composite preforms of varying TiC contents during hot forging

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Abstract

Workability is a measure of the extent of deformation that powder metallurgy materials can withstand prior to fracture occurred in the forming or upsetting processes. Workability of a material is obtained from several parameters namely strain, strain rate and temperature. Hot upsetting of the composite steel preforms with varying TiC contents, namely, 3% and 4%, and aspect ratios, namely, 0.45, 0.71 and 1.25, was carried out at a temperature of 1120 °C and the formability behaviour of the same under triaxial stress state condition was determined. The curves plotted for different preforms were analysed and a relationship was established between the axial strain and the formability stress index (β). The influence of TiC addition, in the steel composite, on the formability stress index, the relative density (R) and various stress ratio parameters, namely, (σθ/σeff), (σm/σeff) and (σz/σeff) were studied. An attempt is also made to relate the fracture strain of the preforms with the formability stress index (β) under triaxial stress state condition.

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Abbreviations

ho :

Initial preform height

hf :

Deformed height of the preform

Do :

Initial diameter of the preform

Dc1 :

Contact diameter of the preform (top surface)

Dc2 :

Contact diameter of the preform (bottom surface)

Dc :

Contact diameter

Db :

Bulged diameter

R:

Relative density

ρo :

Initial preform density

ρth :

Theoretical preform density

ρf :

Deformed preform density

σθ :

True Hoop stress

σz :

True axial stress

σr :

True radial stress

σm :

Mean or hydrostatic stress

σeff :

Effective stress

ɛz :

True axial strain

ɛθ.:

True hoop strain

γ:

Poisson’s ratio

R1 :

Barrel radius

R 22 :

Correlation coefficient

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Authors and Affiliations

  1. Department of Production Engineering, National Institute of Technology, Tiruchirappalli, Tamil Nadu, 620 015, India

    R. Narayanasamy & V. Senthilkumar

  2. Department of Metallurgical Engineering, National Institute of Technology, Tiruchirappalli, Tamil Nadu, 620 015, India

    K. S. Pandey

Authors
  1. R. Narayanasamy
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  2. V. Senthilkumar
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  3. K. S. Pandey
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Corresponding author

Correspondence to V. Senthilkumar.

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Narayanasamy, R., Senthilkumar, V. & Pandey, K.S. Some aspects of workability studies on sintered high strength P/M steel composite preforms of varying TiC contents during hot forging. J Mater Sci 43, 102–116 (2008). https://doi.org/10.1007/s10853-007-2124-6

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  • DOI: https://doi.org/10.1007/s10853-007-2124-6

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