High-chromium cast iron type iron-based self-fluxing alloy powder

Abstract

The invention belongs to the field of surface strengthening, repairing and manufacturing, and relates to high-chromium cast iron type iron-based self-fluxing alloy powder. The alloy powder is composedof the following components, in percentage by weight, of 25% to 30% of Cr, 2.8% to 3.5% of C, 1% to 3% of B, 0.5% to 2% of Si, 1% to 6% of Mo, 1% to 7% of Nb, 2% to 6% of Ni, and the balance Fe. Thealloy powder is prepared by adopting a water atomization method, and can be applied to various cladding processes such as plasma surfacing, argon arc surfacing, oxyacetylene flame surfacing, and gas metal arc welding. According to a component reinforced by cladding the alloy powder, the wear-resisting property is obviously improved, the service life is greatly prolonged, and a good application prospect is achieved.

Description

technical field [0001] The invention belongs to the field of surface strengthening and repairing manufacture, and relates to a high-chromium cast iron type iron-based self-fluxing alloy powder. Background technique [0002] There are two types of iron-based self-fluxing alloys: stainless steel type and high chromium cast iron type. Stainless steel self-fluxing alloys contain more elements such as nickel, chromium, tungsten, aluminum, etc. The strengthening phase of this alloy is mainly composed of intermetallic compounds, the size of the strengthening phase is small, the number is small, and the strengthening effect on the cladding layer is limited, and This type of alloy has a high melting point and poor liquid fluidity, so the surfacing process is poor, which limits its application in the field of surface strengthening and repair. High chromium cast iron type iron-based self-fluxing alloy is a low melting point, self-deoxidation slagging type alloy formed by adding strong...

AI Technical Summary

Problems solved by technology

[0003] (1) The toughness of the alloy is poor, and it is easy to fall off and fail in large size blocks

The microstructure of high chromium cast iron self-fluxing alloys is mainly hypereutectic, and the first precipitated carbides are larger in size, up to 200-300 microns, and in the form of lamellar sheets, which split the continuity of the matrix and significantly reduce the toughness of the cladding layer. , when subjected to impact, it is easy to fall off in large-sized blocks, causing the cladding layer to fail

[0004] (2) The carbide content of the cladding layer is unreasonable

If there are too few carbides, the hardness of the cladding layer will be low, the strengthening effect will not be achieved, and the wear resistance will be poor; if the content of carbides is too high, the toughness of the cladding layer will be reduced, and it will easily crack and fail.

[0005] (3) There are more pores in the alloy cladding layer

Iron-based powder is easily oxidized by moisture, resulting in more pores and defects in the cladding layer, and stress concentration is easy near the pores, resulting in cracking and failure of the cladding layer

[0006] (4) There are large differences in composition and uneven performance

In the domestic market, there is a large gap in the alloy composition of the same brand produced by different manufacturers, and even the alloy composition of different batches of the same brand produced by the same manufacturer is not the same, so the performance is uneven

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