Consolidation and Mechanical Properties of High Strength Rapidly Solidified Al-TM-Ln Alloy Powder.
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Abstract:
Rapidly solidified AI-TM-Ln base alloy has excellent mechanical properties such as high specific strength or specific modulus. In this study, Al92Ni4.5Ti1.5CulZr0.8Ce0.2 (at%) alloy powders were directly forged using a double action forging press without preparing a compact preform that is difficult to consolidate because of the spherical shape and hardness of the powder. The tensile strength of above test pieces preheated at 723K for 3600s shows 670MPa and 2% elongation, which is comparable with the test pieces prepared by extrusion from the same powder. This process gives near net shape parts with excellent mechanical properties using the rapidly solidified Al-TM-Ln base alloy.Keywords:
Consolidation
Elongation
Tensile testing
Powder Metallurgy
Vickers hardness test
Elongation
Tensile testing
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In this paper,the current status of study and application of precise forging technology is reviewed and analyzed.The current status of application and developing direction of precise forging process including hot forging,cold forging,warm forging,compound forging is introduced.The characteristic and present application status of precise forging equipment is analyzed.The characteristic of precise forging mould is summarized and some advanced designing and manufacturing technologies for mould are introduced.The application and existing problems of numerical simulation on forming in precise forging is reviewed from forward simulation and backward simulation.The present research status of process optimization for precise forging is introduced.Finally the trends of precise forging technology are presented briefly.
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Using Forge 2D/3D forging finite element simulation software,the forging environment and deformation process of large forging case were simulated and analyzed.The influences of forging temperature,die design,forging equipment and other factors on the forging blank were discussed.The stress and strain,rule of metal flowing,forging flaw,metal lines,the final geometrical shape of finished forging,etc.during forging were analyzed.The important parameters,such as the weight of cropping,forging energy,heating times,die design,etc.in forging technology design were determined,which provide a reference for forging technology design in actual production.
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The paper presents the results of research on two new forging processes for producing bicycle hub forgings in a three-slide forging press. The first process is related to producing a forging with an axial cavity by flashless forging. The other one concerns the production of a forging from a tube billet. The potential benefits offered by these two new forging processes compared to the conventional hammer forging method for producing hubs are discussed. The designed processes are verified theoretically via numerical simulations. The first of the proposed processes is also subjected to experimental verification. The results demonstrate that the new technologies allow obtaining good quality products. A comparison is made between material and energy consumption in the two analyzed processes and in conventional hammer forging. It is found that the application of the forging process in a three-slide forging press leads to a considerable decrease in manufacturing costs.
Hammer
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Elongation
Tensile testing
Textile
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Industrial pure iron specimens with a thickness that varied from 0.2 to 2.0 mm were investigated in tensile tests to examine the influence of specimen thickness on the percentage elongation and deformation energy.
Elongation
Tensile testing
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Packaging steel is characterized by low thickness (0.1 mm – 0.5 mm) and ferritic microstructure resulting from low carbon contents. In combination with continuous annealing processes and temper rolling, this results in only little elongation observed in tensile tests. However, as in real forming processes much higher deformation occurs, it is important to receive true stress-true strain data up to a highest possible level e.g. to characterize material for finite element analysis. Therefore, tensile tests with three different measuring lengths (80 mm, 50 mm, 20 mm) were conducted for the packaging steel TH415. Likewise, the testing speed was reduced to investigate the possibility to receive more elongation under the condition of a constant stress level. The results revealed a significant increase in elongation when using smaller tensile test geometries. As well, the reduction in testing speed leads to much higher elongation while showing only little strain rate influence. While for the 80 mm geometry and standard speed no homogenous forming condition could be reached due to early failure before Lüders strain, this could be improved by using smaller testing specimens and a lower strain rate. Combining the influence of strain rate and geometry a significant increase of more than ten percentage points in elongation was reached.
Elongation
Tensile testing
Strain (injury)
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The connecting rod cap 150 of the forging process,the process of greening of the forging process,introduced forging die(especially the pre-chamber and the final forging die forging die bore) design,effectively improved the forging process insured the connecting rod cap 150 formed and super exactitude size precision,improved the quality of forgings,forgings qualified product rate,efficiency and service life of forging die forging,reduce cast of forgings.
Service life
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Necking
Elongation
Tensile testing
Strain (injury)
Diffusionless transformation
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