Boron strengthened high-density and high-strength tungsten, nickel and cobalt alloy and preparation method

Abstract

The invention discloses a boron strengthened high-density and high-strength tungsten, nickel and cobalt alloy and a preparation method. The chemical components of the boron strengthened high-density and high-strength tungsten, nickel and cobalt alloy comprise by, weight percentage, 20-55% of W, 0.001-0.1% of B, 0-40% of Co, 0-10% of Nb, 0-20% of Ta, 0-10% of V, 0-4% of Zr, 0-20% of Mo, 0-10% of Ti, 0-10% of Al, 0-20% of Fe, 0-20% of Cr, and the balance Ni and inevitable impurity elements and micro elements. The alloy has high density, super-high strength and high toughness, and is especially good in heat machining process performance, cogging forging can be performed within a wide temperature range, good surface quality is achieved, and cracks are avoided. The alloy can be cast and forged, can also be formed through the 3D printing technology, the density reaches 11.0-13.0 g / cm<3>, the tensile strength can reach 1200 MPa or above, and the impacting toughness reaches 80 J / cm<2> or above.

Description

technical field [0001] The invention belongs to the technical field of high-density alloys, and in particular relates to a boron-strengthened high-density high-strength tungsten-nickel-cobalt alloy and a preparation method thereof. The alloy has high density, ultra-high strength and high toughness, and especially has good thermal processing performance, and can be used at a wide temperature Range open blank forging with good surface quality to avoid cracks. It can be cast and forged, and can also be shaped by 3D printing technology, with a density of 11.0-13.0g / cm 3 , The tensile strength can reach more than 1200MPa, and the impact toughness can reach 80J / cm 2 above. Background technique [0002] Prior to this, the high-density materials commonly used in the world are mainly tungsten alloys. Due to the high melting point of tungsten, such materials are usually sintered and formed by powder metallurgy. At present, the widely used tungsten alloys in the world include W90, W9...

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Problems solved by technology

[0007] The above-mentioned patents all attempt to introduce strengthening elements such as Al, Ti, Nb, etc. into the Ni-W or Ni-Co-W alloy system to obtain high strength and high toughness, although the above-mentioned alloys can be obtained by smelting, forging and aging treatment using conventional metallurgical processes Good performance, but because the W content is too high, when the conventional metallurgical process is used, forging cracks are very easy to appear during the forging billet and hot forming process, such as figure 1 Shown is the cracks that appear in the forging process of W30Co10Ti2AlNi alloy. Therefore, improving the hot workability of tungsten-nickel-cobalt alloys is a prerequisite for the industrial production of this type of alloys using conventional metallurgical processes

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