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TECHNICAL PAPERS

Some Aspects on Hot Forging Features of P/M Sintered High-Strength Titanium Carbide Composite Steel Preforms Under Different Stress State Conditions

[+] Author and Article Information
R. Narayanasamy1

Department of Production Engineering, National Institute of Technology, Tiruchirappalli-620015, Tamil Nadu, Indianarayan@nitt.edu

V. Senthilkumar

Department of Mechanical Engineering, Jayaram College Of Engineering & Technology, Tiruchirappalli-621 014, Tamil Nadu, Indiamrvsk@rediffmail.com

K. S. Pandey

Department of Metallurgical Engineering, National Institute of Technology, Tiruchirappalli-620015, Tamil Nadu, India

1

Corresponding author.

J. Eng. Mater. Technol 129(1), 113-129 (May 06, 2006) (17 pages) doi:10.1115/1.2400261 History: Received March 21, 2005; Revised May 06, 2006

Abstract

Experiments were carried out to evaluate the hot forging features in the high-strength sintered Powder Metallurgy TiC composite steel performs under different stress states, namely, plane and triaxial stress. Cylindrical compacts with aspect ratios 0.45, 0.75, and 1.25 were prepared, sintered and forged at the temperatures of $1120°C+10°C$. The investigation suggests that the experimentally determined relative density has a straight line relationship with the new geometrical shape factor $(ρ0∕ρth)(h0∕hf)(3D02∕(2Db2+Dc2))$. The measured barrel radius of curvature is found to have a circular arc because the above relation is a straight line one. Relationship is established between the measured barrel radius and the stress ratio parameters namely $(σθ∕σz)$, $(σz∕σm)$ and $(σeff∕σz)$ under plane stress and triaxial stress state conditions. An attempt is also made to establish a relationship between the various stress ratio parameters namely $(σθ∕σz)$, $(σz∕σm)$, and $(σeff∕σz)$ under plane stress and triaxial stress state conditions and the relative density.

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Figures

Figure 1

Upset forging test preform before and after deformation

Figure 2

The variation of fractional theoretical density ratio and exp(εz-εθ) Fe–1.0C–3TiC steel hot forged (1150°C)

Figure 3

The variation of the fractional theoretical density ratio with respect to the new geometrical shape factor for Fe–1.0C–3TiC steel hot forged (1150°C)

Figure 4

The variation of the measured barrel radius with respect to the calculated radius in Fe–1.0C–3TiC steel hot forged (1150°C)

Figure 5

(a) The variation of the barrel radius(R) with respect to the stress ratio parameter (σθ∕σz) under plane stress condition in Fe–1.0C–3TiC steel hot forged (1150°C); and (b) the variation of the barrel radius(R) with respect to the stress ratio parameter (σθσz) under triaxial stress condition in Fe–1.0C–3TiC steel hot forged (1150°C)

Figure 6

(a) The variation of the barrel radius(R) with respect to the stress ratio parameter (σz∕σm) under plane stress condition in Fe–1.0C–3TiC steel hot forged (1150°C); and (b) the variation of the barrel radius (R) with respect to the stress ratio parameter (σz∕σm) under triaxial stress condition in Fe–1.0C–3TiC steel hot forged (1150°C)

Figure 7

(a) The variation of the bulge radius with respect to the stress ratio parameter (σeff∕σz) under plane stress condition in Fe–1.0C–3TiC steel hot forged (1150°C); and (b) the variation of the bulge radius with respect to the stress ratio parameter (σeff∕σz) under triaxial stress condition in Fe–1.0C–3TiC steel hot forged (1150°C)

Figure 8

The variation of the bulge radius (R) with respect to the new Poisson’s ratio (γ1) in Fe–1.0C–3TiC steel hot forged (1150°C)

Figure 9

(a) The variation of the barrel radius(R) with respect to the stress ratio parameter (σθ∕σz) under plane stress condition in Fe–1.0C–3TiC steel hot forged (1150°C) (in natural logarithmic scale); and (b) the variation of the barrel radius(R) with respect to the stress ratio parameter (σθ∕σz) under triaxial stress condition in Fe–1.0C–3TiC steel hot forged (1150°C) (in natural logarithmic scale)

Figure 10

(a) The variation of the barrel radius(R) with respect to the stress ratio parameter (σz∕σm) under plane stress condition in Fe–1.0C–3TiC steel hot forged (1150°C) (in natural logarithmic scale); and (b) the variation of the barrel radius(R) with respect to the stress ratio parameter (σz∕σm) under triaxial stress condition in Fe–1.0C–3TiC steel hot forged (1150°C) (in natural logarithmic scale)

Figure 11

(a) The variation of the bulge radius with respect to the stress ratio parameter (σeff∕σz) under plane stress condition in Fe–1.0C–3TiC steel hot forged (1150°C) (in natural logarithmic scale); and (b) the variation of the bulge radius with respect to the stress ratio parameter (σeff∕σz) under triaxial stress condition in Fe–1.0C–3TiC steel hot forged (1150°C) (in natural logarithmic scale)

Figure 12

The variation of Poisson’s radius(γ) with respect to the new Poisson’s radius(γ1) for Fe–1.0C–3TiC steel hot forged (1150°C)

Figure 13

The variation of barrel radius(R) with respect to the new Poisson’s radius(γ1) for Fe–1.0C–3TiC steel hot forged (1150°C)

Figure 14

(a) The variation of the stress ratio parameter (σθ∕σz) under plane stress condition with respect to the relative density (ρf∕ρth) for Fe–1.0C–3TiC steel hot forged (1150°C); and (b) the variation of the stress ratio parameter (σθ∕σz) under triaxial stress condition with respect to the relative density (ρf∕ρth) for Fe–1.0C–3TiC steel hot forged (1150°C)

Figure 15

(a) The variation of the stress ratio parameter (σz∕σm) under plane stress condition with respect to the relative density (ρf∕ρth) for Fe–1.0C–3TiC steel hot forged (1150°C); and (b) the variation of the stress ratio parameter (σz∕σm) under plane stress condition with respect to the relative density (ρf∕ρth) for Fe–1.0C–3TiC steel hot forged (1150°C)

Figure 16

(a) The variation of the stress ratio parameter (σeff∕σz) under plane stress condition with respect to the relative density (ρf∕ρth) for Fe–1.0C–3TiC steel hot forged (1150°C); and (b) the variation of the stress ratio parameter (σeff∕σz) under triaxial stress condition with respect to the relative density (ρf∕ρth) for Fe–1.0C–3TiC steel hot forged (1150°C)

Figure 17

(a) The variation of the stress ratio parameter (σθ∕σz) under plane stress condition with respect to the relative density (ρf∕ρth) for Fe–1.0C–3TiC steel hot forged (1150°C) (in natural logarithmic scale); and (b) the variation of the stress ratio parameter (σθ∕σz) under triaxial stress condition with respect to the relative density (ρf∕ρth) for Fe–1.0C–3TiC steel hot forged (1150°C) (in natural logarithmic scale)

Figure 18

(a) The variation of the stress ratio parameter (σz∕σm) under plane stress condition with respect to the relative density (ρf∕ρth) for Fe–1.0C–3TiC steel hot forged (1150°C) (in natural logarithmic scale); and (b) the variation of the stress ratio parameter (σz∕σm) under plane stress condition with respect to the relative density (ρf∕ρth) for Fe–1.0C–3TiC steel hot forged (1150°C) (in natural logarithmic scale)

Figure 19

(a) The variation of the stress ratio parameter (σeff∕σz) under plane stress condition with respect to the relative density (ρf∕ρth) for Fe–1.0C–3TiC steel hot forged (1150°C) (in natural logarithmic scale); and (b) the variation of the stress ratio parameter (σeff∕σz) under triaxial stress condition with respect to the relative density (ρf∕ρth) for Fe–1.0C–3TiC steel hot forged (1150°C) (in natural logarithmic scale)

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