Composite powder particle of high-vanadium and high-boron alloy for surfacing and application method of composite powder particle

Abstract

The invention relates to a composite powder particle of a high-vanadium high-boron alloy for surfacing, which is prepared by the following steps: sieving and weighing powder components, dry-mixing the powder, adding a liquid binder into the mixed powder for wet mixing, rotating, bonding and granulating the wet powder, blow-drying with hot air, sintering at low temperature and sieving to prepare the composite powder particle with the particle size of 10-15 meshes, and carrying out submerged arc surfacing by taking an H08A solid welding wire as an electric arc carrier. And the composite powder particle melt and the solid welding wire molten drops are fused into an integrated surfacing weld pool, and the integrated surfacing weld pool is solidified to form the high-vanadium and high-boron alloy containing the V3B2 phase with the microhardness average value reaching up to 1844 HV or above. The main wear-resistant phase of the prepared high-boron alloy comprises a blocky V3B2 phase, an M2B phase (M = Fe, V or Cr) and a VC phase, the volume fraction is up to 60% or above, and the volume fraction of metamorphic eutectic is lower than 10%. The high-vanadium and high-boron alloy composite powder particles can be applied to surfacing wear-resistant alloy layers of parts under high-temperature-resistant and low-stress abrasive particle wear working conditions, such as tooth heads of single-roll crushers for crushing high-temperature slag.

Description

technical field [0001] The invention belongs to the technical field of wear-resistant surfacing welding, and particularly relates to a composite powder of a high vanadium and high boron alloy for surfacing welding and an application method thereof. Background technique [0002] High boron alloys are used as wear-resistant parts materials, mainly because of their good economy and high wear resistance. The alloy preparation methods mainly include: sand casting, thermal infiltration and surfacing. In sand casting, due to the large structure and thick wall of the casting, the high boron alloy is brittle, and the amount of boron and other alloying elements that can be added is relatively small, and the types of high boron alloys that can be prepared are relatively limited. The thermally expanded boron alloy needs to heat the workpiece to 850~900℃ for 5 hours so that the boron atoms diffuse to the inner surface layer. For workpieces under particle wear conditions, the seepage la...

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Problems solved by technology

This is because wear-resistant surfacing materials, such as flux-cored wires and coated electrodes, are currently unable to contain 100% chromium and boron components, and there will always be more than 50% iron components, which is unavoidable High-boron alloys generally have more than 30% metamorphic eutectic ((α-Fe+Fe 3 (C,B)), which makes the melting point low, which makes it difficult for the surfacing high-boron iron-based alloy to continue to serve under high-temperature and low-stress abrasive wear conditions, resulting in its excellent forming advantages not being utilized

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