Some features on hot forging of powder metallurgy sintered high strength 4 % titanium carbide composite steel preforms under different stress state conditions

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• 作者：R. Narayanasamy ; V. Senthilkumar ; K.S. P ; ey
• 关键词：Plane stress ; Triaxial stress ; Relative density ; Poisson’ ; s ratio ; Stress ratio parameter ; Barrel radius
• 刊名：Materials and Design
• 出版年：2008
• 出版时间：2008
• 年：2008
• 卷：29
• 期：7
• 页码：1380-1400
• 全文大小：285 K

文摘

In this paper, the authors propose mathematical expressions for the determination of different stress ratio parameters under plane and triaxial stress state conditions. Experiments were carried out to evaluate the hot forging features in the high strength sintered powder metallurgy 4 % titanium carbide composite steel performs under different stress states, namely, plane stress and triaxial stress states. Cylindrical compacts with aspect ratios 0.45, 0.75 and 1.25 were prepared, sintered and forged at the temperatures of 1120 ± 10 °C. The investigation suggests that the experimentally determined relative density has a straight-line relationship with the new geometrical shape factor. The measured barrel radius of curvature is found to have a circular arc. Relationship is established between the measured barrel radius and the stress ratio parameters under plane and triaxial stress state conditions. An attempt is also made to establish a relationship between the various stress ratio parameters under plane and triaxial stress state conditions and the relative density.