High-hardness non-cracking martensite iron-based alloy powder for laser cladding layer and preparation method for high-hardness non-cracking martensite iron-based alloy powder

Abstract

The invention discloses high-hardness non-cracking martensite iron-based alloy powder for a laser cladding layer and a preparation method for the high-hardness non-cracking martensite iron-based alloy powder. The high-hardness non-cracking martensite iron-based alloy powder for the laser cladding layer consists of the following components in percentage by mass: 16-17% of Cr, 2.0-5.0% of Ni, 0.05-0.15% of B, 0.1-0.7% of Si, 0.1-0.3% of C and the balance of Fe. The alloy with the components is subjected to vacuum smelting and gas atomization to obtain the high-hardness non-cracking martensite iron-based alloy powder for the laser cladding layer. According to the special martensite iron-based alloy powder for laser cladding, the cladding layer is obtained by virtue of a laser quick forming technology, wherein average Rockwell hardness of the cladding layer is 58.58HRC, and the surface and the section of the cladding layer are free of defects such as cracks, air holes and the like; by utilizing volumetric expansion effect generated by martensite phase transformation, residual stress of the laser cladding layer is pressure stress, so that initiation and propagation of cracks are effectively restrained, and high-hardness non-cracking use requirements of the laser cladding layer can be met.

Description

technical field [0001] The invention belongs to the technical field of laser remanufacturing, and relates to a high-hardness non-cracking laser cladding layer martensitic iron-based alloy powder, and also relates to a preparation method of the powder. Background technique [0002] Laser cladding technology is an emerging surface modification method in recent years. The use of laser cladding technology to prepare high-hardness cladding layers can greatly improve the service life of parts, and has great potential in industrial applications. Relevant research has a history of nearly 40 years, and there are many related theoretical and experimental studies. However, this technology has not been widely promoted and applied in industrial production. The main reason is that the laser cladding layer is easy to crack, and the laser cladding Especially when the hardness of the formed part is high. [0003] At present, the commonly used laser cladding alloy powders are mainly iron-bas...

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Problems solved by technology

[0004] At present, the methods of controlling residual stress mainly include reducing the temperature gradient, using micro-forging, ultrasonic vibration, etc., but these methods are complicated in process and cannot effectively prevent the generation of cracks.

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