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

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.