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A kind of anti-scratch iron-based surfacing material and preparation method thereof

A surfacing material and anti-scratch technology, which is applied in the field of surface engineering and surface wear resistance, can solve problems such as inapplicability to on-site construction, achieve good surfacing technology, good plasticity, and increase the effect of martensitic transformation temperature

Active Publication Date: 2022-07-08
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it needs to be made by hot isostatic pressing or powder sintering, which is not suitable for on-site construction

Method used

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  • A kind of anti-scratch iron-based surfacing material and preparation method thereof
  • A kind of anti-scratch iron-based surfacing material and preparation method thereof
  • A kind of anti-scratch iron-based surfacing material and preparation method thereof

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specific Embodiment

[0033] 1. A nitrogen-containing iron-based scratch-resistant surfacing flux-cored welding wire, the weight ratio of the welding wire components is: Cr: 22wt.%; Ni: 7.5wt.%; C: 1.2wt%; N: 0.1wt.%; Mn: 5 wt.%; Si: 3.3 wt.%; Mo: 2 wt.%; Nb: 0.8 wt.%; Fe balance. The flux-cored welding wire is partially filled with powder, and agglomeration is carried out by using a polyvinyl alcohol solution (pva) with a concentration of 5% by volume at a ratio of solution to powder mass ratio of 1:10, and then degumming in a vacuum tube furnace at 500 °C for 2 hours , select the powder with a particle size of 100-200 mesh with a screen, put the mixed powder into the powder mixer and mix for 40 minutes to obtain the required powder, and the core accounts for 30% of the total mass of the welding wire. The parameters of the plasma arc surfacing welding process are: plasma arc current 80A, steady arc current 50A, voltage 30V, wire feeding speed: 1000mm / min, and the plasma gas is output after mixing ...

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Abstract

A scratch-resistant iron-based surfacing material and a preparation method thereof belong to the field of surface engineering. The surfacing material is prepared by a flux-cored welding wire, and the flux-cored raw materials include: chromium carbide powder, chromium nitride powder, and electrolytic manganese powder , silicon powder, reduced iron powder, nickel powder, chromium powder, niobium powder and molybdenum powder; the composition range of each element is as follows: Cr: 22-25wt.%; Ni: 4-7.5wt.%; C: 1.0-1.2wt% ; N: 0.1-0.4wt.%; Mn: 4-5wt.%; Si: 3.3-3.5wt.%; Mo: 1-2wt.%; Nb: 0.6-0.8wt.% and Fe balance. In the present invention, on the one hand, elements with greater chemical affinity with nitrogen, such as Cr, Mn, V, Nb, are added to the surfacing material to increase the content of nitrides; The loss of nitrogen increases the dissolved amount of nitrogen in the surfacing layer, and finally a low-nickel austenite surfacing layer is obtained. Due to the increase of nitrogen content, the scratch resistance of the surfacing layer is significantly improved.

Description

Technical field: [0001] The invention belongs to the field of surface engineering, and is mainly applied to the valve sealing surface and the similar surface wear-resistant field that bears heavy loads under medium and low temperature working conditions below 400°C. Background technique: [0002] Valve sealing is the key to the fluid conveying pipeline system, but when the valve sealing surface is subjected to excessive load, the surface is often stuck and scratched or even locked, which affects the sealing effect. This problem is in nuclear power, thermal power and other energy equipment. extremely important. According to statistics, accidents caused by valve sealing surface failures in nuclear power plants account for 1 / 4 of the world. For a long time, the surfacing material on the valve sealing surface has been occupied by cobalt-based alloys (stellite alloys). Cobalt-based alloys have high hardness, good corrosion resistance, cavitation resistance, adhesion resistance a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K35/40
CPCB23K35/3086B23K35/40Y02P10/20
Inventor 李辉王梦宇郭许航林健符寒光
Owner BEIJING UNIV OF TECH
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