Preparation method of alloy powder and coating layer for preparing iron-base cladding layer

Abstract

The invention relates to a preparation method of alloy powder and a coating layer for preparing an iron-base cladding layer, and belongs to the technical field of coating layers. The alloy powder comprises the following components in percentage by weight: 12-18% of Cr, 20-28% of Mo, 1-1.8% of C, 2.5-4.5% of B, 0.3-1.2% of Si, 0.5-1.2% of Mn and the balance of Fe. The coating layer is prepared through the following step of: firstly pretreating a base body, wherein process parameters are as follows: a transferred arc voltage is 29-32 V, a transferred arc current is 70-80 A, a spraying distance is 12-14 mm, an ion gas is 4-4.5 L / h, a power delivery gas is 4-4.5 L / h, a protective gas is 6.5-7 L / h, and a power delivery voltage is 6.0-6.5 V. The cladding layer prepared by the method disclosed by the invention has the advantages of high rigidity, good abrasion resistance and less tendency of crack generation and other cladding defect generation.

Description

technical field [0001] The invention belongs to the technical field of coating layers, and in particular relates to an alloy powder material for an iron-based cladding layer and a preparation method for the coating layer. Background technique [0002] In mining, oil and gas drilling and other industrial fields, the wear of key components under harsh working conditions has caused huge economic losses and seriously affected production efficiency. Reasonable surface protection technology is usually used to endow it with better wear resistance than the base material, thereby prolonging the service life of the overall component. Among them, plasma transferred arc-welding (PTAW) technology has the advantages of high deposition rate, low dilution rate, and wide application range of powder. It is considered to solve the problem of component wear under similar service conditions, and to achieve surface strengthening and One of the more economical and effective technical means combin...

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Problems solved by technology

However, since both Ni and W are rare metals with high cost, the development of low-cost, high-performance alternative materials for Fe cladding layer has become one of the hot issues in this field of research in recent years.

After searching, there is currently no patent report on the preparation of Fe-based multi-element alloy cladding layer containing Mo-rich boride reinforcement phase by plasma arc surfacing welding method.

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