A high hardness and density forged molybdenum head. The forged molybdenum head is prepared by the following method: Material selection, matching, mixing, called heavy charging, shaping, pressing, turning forming, high temperature sintering, and then heating forging press to forming, turning correction, that is, the forging and pressing of the molybdenum head, wherein the heating forging step is to maintain 5 ~ 10min at the temperature of 1100 ~ 1580℃, and then forging in the forging equipment, repeat heating forging process until forming, Each forging size is 3 ~ 6mm. The hardness and density of the forged molybdenum head of the invention are high, the average density is more than 9.7g/cm3, which is 2.5 ~ 5 percentage points higher than that of the ordinary molybdenum head, and the Vickers hardness can reach more than 300, which is 30%-50% higher than that of the ordinary molybdenum head. Strong wear resistance, in the process of perforation than the ordinary molybdenum tip more than 200 wear, wear degree increased by 60 ~ 70%, greatly reducing the cost of perforated steel pipe.
Molybdenum tips are mainly used for penetrating seamless steel tubes such as stainless steel, alloy steel and high alloy steel. The existing molybdenum tips are mostly made of molybdenum alloy, with a density of 9.2 ~ 9.4g/cm3. Some molybdenum tips are also made of molybdenum powder, and the preparation method is as follows: Material selection, matching, mixing, called reloading, shaping, pressing, turning forming, high temperature sintering, and then the product inspection. Compared with alloy molybdenum tip, the density and hardness of molybdenum tip are improved. However, considering the cost reduction of perforated steel pipe, how to prepare molybdenum tip with greater hardness and density and higher wear resistance so as to reduce the cost of perforation has always been a problem that the perforation industry is committed to solving.
Ti-5Al-5Mo-5V-3Cr(Ti-5553) was mixed with 325-mesh titanium powder and 250-mesh Al-30.4Mo-28.0V-16.7Cr four-element intermediate alloy powder, which was pressed by cold isostatic pressure at 250MPa for 1min and then vacuum sintered at 1150℃ for 4.5h. The ingot billet of powder metallurgy Ti-5553 alloy was obtained.
At 1060℃(phase change point above 80℃) three upsetting three drawing forging blank, after 930℃(phase change point below 50℃) three upsetting three drawing forging Φ30mm bar blank, and then at 900℃(phase change point below 80℃) through two times rolling Φ11mm bar, the phase change point is 980℃±5℃; The bar was annealed, held at 600℃ for 1h, and air-cooled to obtain powder metallurgy β-type titanium alloy.
