A kind of argon arc surfacing welding FECRC iron-based powder alloy and its preparation process

Abstract

Disclosed is a Fe-based alloy powder for argon arc overlay welding, the powder consisting of Fe-Cr, graphite, and iron powder. A process for preparing the Fe-based alloy powder for argon arc overlay welding comprises: uniformly mixing Fe-Cr, graphite, and iron powder according to a certain ratio, and preparing same into flakes with sodium silicate as a binder; the flakes are naturally dried for 10 h and then placed in a drying oven and dried at 200°C for 1.5 h, and oven cooled. With a tungsten electrode argon arc as a heat source, the obtained substance is overlay welded on the surface of a material to form a wear- and corrosion-resistant molten cladding layer. The molten cladding layer has a uniform texture, and can generate new phases such as chromium-carbon compounds; the deposit welded layer has a hardness greater than HRC55 and can effectively improve material performances such as wear-, corrosion-, and high temperature-resistance, so as to extend the service life of parts. In addition, the Fe-based alloy powder for argon arc overlay welding is simple to prepare, low in cost, and thus has a relatively high use value.

Description

technical field [0001] The invention relates to the technical field of material surface, in particular to an iron-based alloy powder alloy for argon arc surfacing welding, a preparation process thereof and an argon arc surfacing welding technology. Background technique [0002] With the rapid development of energy, chemical, transportation and other industries and the development of modern engineering technology, the performance requirements of materials have also increased accordingly, especially in petrochemical, electric power, hydraulic, metallurgical and other industries, equipment is mostly under high temperature, high pressure, and heavy load , strong corrosion and other complex and harsh working environments, material wear, fatigue, corrosion and other failure phenomena are more serious. According to incomplete statistics, 1 / 3 to 1 / 2 of energy is consumed in wear and tear. Nearly 30% of the steel produced in the world every year is scrapped due to corrosion. The wear...

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Problems solved by technology

[0003] At present, surface treatment technologies such as thermal spraying, electroplating, laser strengthening technology, and surfacing welding are widely used at home and abroad to improve the service performance and life of mechanical parts, but thermal spraying technology can only prepare coatings that are mechanically bonded and cannot achieve metallurgical bonding; electroplating The degree of automation of process repair is not high, the labor intensity is high, the electroplating layer is generally very thin, and it is difficult to repair the damaged parts

Laser strengthening technology has been widely used in the preparation of surface cladding layers, but the required equipment and maintenance costs are high, the one-time investment is large, the energy utilization rate is low, the workplace is fixed, and it is not suitable for on-site operation

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