Medical titanium material The manufacturer introduced that although the inherent characteristics of the material will affect the difficulty of the extrusion process, the thickness of the extrusion jacket and the extrusion method will also affect the quality of the extruded products, the extrusion temperature is an important factor in controlling the hot extrusion parameters. Excessive hot extrusion temperature may damage the microstructure of titanium plate products and shorten the life of extrusion tools; Low hot extrusion temperature will make extrusion difficult.

Compared with the low strain rate of hot isostatic pressing of titanium plate, powder forging has higher high temperature strain rate. Through hot forging, not only compact product shape and size can be obtained, but also uniform thread grain structure can be obtained, which significantly improves the strength and toughness of the product. At the same time, it can keep the advantages of less powder metallurgy and no chip, and has the characteristics of accurate forming, high material utilization rate, low forging energy, long die life and low cost.

In plastic flow, the behavior of porous compacts is the main concern of powder forging.

Powder forging is the combination of densification and flow in the process of uniaxial pressing. In powder forging, reducing friction is very important to improve the density and performance uniformity of forged products. Without lubrication, forged powder products will show low density in the radial area. The friction in the forging process will produce tensile stress around, resulting in microcracks.

In powder compacts, high porosity means that the material is fragile and has low Poisson's ratio.

At high temperature, due to the low strength and work hardening of titanium material, the metal shows good fluidity under stress. The stress required for green billet deformation to full density at room temperature is much higher than the actual stress. To achieve full density, it can be pressed by heating. The green billet with high hole clearance is much more fragile than the cast plated product. If green billet is densified by hot forming, its properties can be similar to those of casting silver products. Although hot forging to full density is difficult, eliminating the hole gap is very beneficial to product performance. The main high strain (generally greater than 50%) is conducive to eliminating the pore gap and good bonding between particles. Of course, excessive principal high strain may lead to microcracks., The size of the titanium plate compactor must be sufficient to fill the part shape with full density. The hot forging temperature depends on the stress required to obtain sufficient deformation. The size and density of the briquette depend on the shape of the transverse part of the mold. Excessive ratio of original height to diameter may cause wrinkles, so the ratio of height to diameter is also limited.

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