Composite powder particle of submerged arc surfacing high boron alloy and application method thereof

Abstract

The invention provides a composite powder particle of a submerged arc surfacing high boron alloy and an application method thereof, 6-14 meshes of composite powder particle made by the steps of powdercomponent dry mixing, soaking mixed powder in pure water to be mixed and wetted, rotary bonding granulation, low temperature sintering, sieving and the like is prefabricated in a weld bead, and a solid welding wire is used as an arc carrier for submerged arc surfacing, so that the composite powder melt and the solid welding wire droplet are fused into an integrated surfacing weld pool. Under theaction of arc heat, most of the boron carbide and metal chromium components contained in the composite powder particle are subjected to in-situ metallurgical reaction to form a primary M2B hypereutectic high boron alloy with a large length-width ratio and a microhardness average reaching 1622 HV. The high boron alloy prepared by the composite powder particle has excellent abrasion resistance and high toughness, and can be used for submerged arc surfacing welding wear-resistant alloy layers of parts under a low stress abrasive wear condition, and can protect the open arc welding directly.

Description

technical field [0001] The invention belongs to the technical field of wear-resistant surfacing welding, and in particular relates to a composite powder of high boron alloy for submerged arc surfacing welding and an application method thereof. Background technique [0002] High-boron alloys are used as materials for wear-resistant parts, mainly because of their excellent abrasive wear resistance. Since the solubility of boron in γ-Fe and α-Fe substrates is lower than 0.02%, Fe 2 Wear-resistant phases such as B are easy to precipitate, so they are more economical than similar high-chromium cast irons. [0003] The preparation methods of high boron alloys include: sand casting, thermal expansion and surfacing. Sand casting can produce boron alloys with good wear resistance, but the castings are often too thick, the alloy borides are too brittle, and the boron and carbon atoms in the casting melt repel each other to form too many eutectic or fishbone ledeburite Such brittle p...

AI Technical Summary

Problems solved by technology

However, the (Fe,Cr) of high boron alloy 2 The microhardness of the main wear-resistant phases such as B is generally between 900 and 1300HV. The Cr content of this phase is low, and the toughness and corrosion resistance deviate, so the cost-effective potential of this type of high-boron alloy cannot be fully utilized.

[0005] Not only that, due to the complicated preparation process of welding materials such as coated electrodes and flux-cored wires used to prepare boron alloys, the research, development and utilization cycle of new boron alloys is long, and the consumption of manpower and material resources is too large. The progress of alloy research is slow, so it is urgent to simplify and improve the preparation materials and methods of this high boron surfacing alloy

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