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 (ρ0ρth)(h0hf)(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 (σθσz), (σzσm) and (σeffσz) under plane stress and triaxial stress state conditions. An attempt is also made to establish a relationship between the various stress ratio parameters namely (σθσz), (σzσm), and (σeffσz) under plane stress and triaxial stress state conditions and the relative density.

1.
Johnson
,
P. K.
, 2000, “
Outstanding P/M Designs Replace Stamped, Cast and Machined Parts
,”
Int. J. Powder Metall.
0020-7535,
36
, pp.
49
56
.
2.
Mocarski
,
S.
, and
William Hall
,
D.
, 1987, “
Powder Metallurgy Applications for Automotive Applications
,”
Int. J. Powder Metall.
0020-7535,
23
, pp.
109
125
.
3.
Brown
,
G. T.
, and
Jones
,
P. K.
, 1982, “
Experimental and Practical Aspects of the Powder Forging Process
,”
Modern Developments in Powder Metallurgy
,
E. N.
Aqua
, ed.,
New Jersey
, Vol.
15
, pp.
369
394
.
4.
Kuhn
,
H. A.
, and
Downey
,
C. L.
, 1971, “
Deformation Characteristics and Plasticity Theory of Sintered Powder Materials
,”
Int. J. Powder Metall.
0020-7535,
7
, pp.
15
.
5.
Green
,
R. J.
, 1972, “
A Plasticity Theory for Porous Solids
,”
Int. J. Mech. Sci.
0020-7403,
14
, pp.
215
224
.
6.
Lee
,
D. N.
, and
Kim
,
H. S.
, 1992, “
Plastic Yield Behaviour of Porous Metals
,”
Powder Metall.
0032-5899,
35
, pp.
275
279
.
7.
Doraivelu
,
S. M.
,
Gegel
,
H. L.
,
Gunasekaran
,
J. S.
,
Malas
,
J. C.
, and
Morugan
,
J. T.
, 1984, “
A New Yield Function for Compressible P/M Materials
,”
Int. J. Mech. Sci.
0020-7403,
26
, pp.
527
535
.
8.
Narayan Murty
,
S. V. S.
,
Nageswaran Rao
,
B.
, and
Kashyap
,
B. P.
, 2004, “
Improved Ductile Fracture Criterion for Cold Forming of Spheroidised Steel
,”
J. Mater. Process. Technol.
0924-0136,
147
, pp.
94
101
.
9.
Narayanasamy
,
R.
, and
Ponalagusamy
,
R.
, 2000, “
A Mathematical Theory of Plasticity for the Upsetting of Compressible P/M Materials
,”
J. Mater. Process. Technol.
0924-0136,
97
, pp.
107
109
.
10.
Pandey
,
K. S.
, 1982, “
Densification Behavior of Iron and Iron Based Alloy Powder Preforms During Hot Forging
,” Ph.D. thesis, University of Roorkee, Roorkee, UP, India.
11.
Kulkarni
,
K. M.
, and
Kalpakjian
,
S.
, 1969, “
A Study of Barreling as an Example of Free Deformation
,”
ASME J. Eng. Ind.
0022-0817,
91
, pp.
743
754
.
12.
Shey
,
J. A.
,
Venner
,
T. R.
, and
Takomana
,
S. L.
, 1982, “
Shape Changes in the Upsetting of Slender Cylinders
,”
ASME J. Eng. Ind.
0022-0817,
104
, pp.
79
83
.
13.
Narayansamy
,
R.
,
Murty
,
R. S. N.
,
Viswanathan
,
K.
, and
Chary
,
G. R.
, 1988, “
Prediction of the Barreling of Solid Cylinders Under Axial Compressive Loading
,”
J. Mech. Work. Technol.
0378-3804,
16
, pp.
21
30
.
14.
Satsangi
,
P. S.
,
Sharma
,
P. C.
, and
Prakash
,
R.
, 2003, “
An Elastic-Plastic Finite Element Method for the Analysis of Powder Metal Forging
,”
J. Mater. Process. Technol.
0924-0136,
136
, pp.
80
.
15.
Ko
,
D.-C.
,
Kim
,
D.-H.
, and
Kim
,
B.-M.
, 1999,
Int. J. Mach. Tools Manuf.
0890-6955,
39
, pp.
771
784
.
16.
Narayansamy
,
R.
, and
Pandey
,
K. S.
, 2000, “
A Study of Barreling of Sintered Iron Preforms During Hot Upset Forging
,”
J. Mater. Process. Technol.
0924-0136,
100
, pp.
84
94
.
17.
Narayan
,
R.
, 2002, Ceramic Coatings, IIT, Kanpur, India, private communication.
18.
Narayanasamy
,
R.
, and
Pandey
,
K. S.
, 1997, “
Salient Features in the Cold Upset Forming of Sintered Aluminium—3.5 Percent Alumina Powder Composite Preforms
,”
J. Mater. Process. Technol.
0924-0136,
72
,
201
207
.
19.
Narayanasamy
,
R.
, and
Pandey
,
K. S.
, 1997, “
Phenomenon of Barreling in Aluminium Solid Cylinders During Cold Upset Forming
,”
J. Mater. Process. Technol.
0924-0136,
70
, pp.
17
21
.
20.
Narayanasamy
,
R.
,
Ramesh
,
T.
, and
Pandey
,
K. S.
, 2006, “
Workability Studies on Cold Upsetting of Al–Al2O3 Composite Material
,”
Mater. Des.
0264-1275,
27
, pp.
566
575
.
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