Hydrostatic radial forward tube extrusion as a new plastic deformation method for producing seamless tubes

作者：Jamali S S; Faraji G^*; Abrinia K

来源：International Journal of Advanced Manufacturing Technology, 2017, 88(1-4): 291-301.

DOI：10.1007/s00170-016-8754-6

• Radial forward extrusion
• Hydrostatic pressure
• Mechanical properties
• Aluminum
• Effective strain

Hydrostatic radial forward tube extrusion (HRFTE) as a new and innovative method is developed for producing large-diameter seamless tubes from smaller hollow billets. The HRFTE process is based on hydrostatic pressure, and radial forward tube extrusion provides the possibility of producing a large-diameter tube with low hydraulic oil pressures. In this procedure, a movable punch placed inside the hollow billet plays the main role in reducing the required hydrostatic pressure. The HRFTE process was applied to pure aluminum at room temperature, and the mechanical properties, material flow behavior, and microstructural evolution were examined. Since the large effective strains were applied to the material during the process, the strength and hardness were significantly improved. Yield and ultimate strength were increased, respectively, about 2.48 and 1.86 times compared to the initial values. Microhardness was also increased to 59 Hv from the initial value of 28 HV. Good homogeneity of effective strain and microhardness in the longitudinal section was observed, but there is an inhomogeneity along the tube thickness. The HRFTE process seems to be an extrusion process with a high capability of industrialization for producing a large-diameter seamless tube with superior mechanical properties using low hydrostatic pressures.

• 出版日期2017-1