Castable and forgeable solid solution tungsten alloy and preparation method

Abstract

The invention discloses castable and forgeable solid solution tungsten alloy and a preparation method, and belongs to the technical field of refractory alloy. According to the chemical components, thecastable and forgeable solid solution tungsten alloy comprises, by weight percentage, 20%-75% of W, 0%-20% of Mo, 0%-20% of Nb, 0%-20% of Ta, 0%-10% of Hf, 0%-10% of V, 0%-10% of Zr, 0%-10% of Ti, 0%-10% of Al, 0%-5% of Cu and the balance Ni or Co and inevitable impurity elements and microelements, specifically, the Ni element and the Co element can be partially replaced by one or two or more elements of 0%-50% of Ir, 0%-30% of Fe, 0%-20% of Cr, 0%-20% of Re and 0%-20% of Ru. The castable and forgeable solid solution tungsten alloy further comprises the following one or two or more grain boundary strengthening elements of 0.001%-1.0% of C, 0.001%-1.0% of B, 0.001%-1.0% of Y, 0.001%-1.0% of La or Ce or the rare earth element, 0.001%-1.0% of Mg and 0.001%-1.0% of Ca. The castable and forgeable solid solution tungsten alloy has the advantages of being high in density, ultrahigh in strength, high in toughness and high in hot-working performance. The alloy is castable and forgeable and canbe formed through 3D printing, the density ranges from 11.0g / cm<3> to 15.0g / cm<3>, the impact toughness is 80J / cm<2> or above, and the tensile strength is 1700MPa or above.

Description

technical field [0001] The invention belongs to the technical field of refractory alloys, in particular to a castable wrought solid solution tungsten alloy and a preparation method thereof. Background technique [0002] Prior to this, tungsten alloys were commonly used high-density materials in the world. Due to the high melting point of tungsten, such materials were usually sintered by powder metallurgy. At present, tungsten alloys widely used in the world include W90, W93, W95 and W97. etc. The density of this kind of material is very high, which can reach 15-18g / cm 3 , but the strength is low and the toughness is poor. The tensile strength of the normal sintered state reaches 800MPa, and the elongation is 20-30%. In order to achieve higher strength, large plastic deformation is required, and its strength can reach about 1400MPa, but the plasticity and toughness are greatly reduced, only about 10%. Especially the powder metallurgy process determines that the microstructur...

AI Technical Summary

Problems solved by technology

[0009] The above patents try to obtain better performance through smelting, forging and aging treatment, but the strengthening method is relatively simple, the strength is low, generally below 1500MPa, and the density is low

Unable to guarantee a certain toughness while the strength reaches 1700MPa or more

[0010] In particular, when the above-mentioned invention adopts the conventional metallurgical casting and forging process, forging cracks are very easy to appear during the forging billet opening and hot forming process, as shown in the specification figure 1 The figure shows the cracks in the Ni57W30Co10Ti2AlNi alloy during the forging process. Therefore, how to improve the hot workability of the tungsten-nickel-cobalt alloy is a prerequisite for the industrial production of this type of alloy using conventional metallurgical processes.

Images