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Alloy powder for laser remanufacturing of martensitic stainless steel parts and preparation method thereof

A laser remanufacturing and alloy powder technology, which is applied in the coating process and coating of metal materials, can solve problems such as unspecified damage types, achieve the effects of alleviating residual stress and cracks, good repairing effect, and improving formability

Active Publication Date: 2017-10-27
ACADEMY OF ARMORED FORCES ENG PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, most of the alloy powders developed for laser remanufacturing do not specify the applicable damage types

Method used

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  • Alloy powder for laser remanufacturing of martensitic stainless steel parts and preparation method thereof
  • Alloy powder for laser remanufacturing of martensitic stainless steel parts and preparation method thereof
  • Alloy powder for laser remanufacturing of martensitic stainless steel parts and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In this embodiment, an alloy powder for laser cladding remanufacturing of volume damage of FV520B stainless steel parts is provided, which is used for volume damage repair of FV520B stainless steel parts. The chemical composition of the alloy powder is: C: 0.03% ; Cr: 14%; Ni: 5%; Mo: 1.4%; Mn: 0.6%; Nb: 0.3%; Cu: 2%; Si: 0.35%;

[0033] The preparation method of above-mentioned alloy powder comprises the following processes:

[0034] 1. Prepare raw materials for making metal powder by mixing Fe, Cr, Si, Ni, C, Mo, Nb, Mn, and Cu according to the above weight percentages;

[0035] 2. Start smelting according to the requirements of the smelting process, and the melting temperature is about 1500-1550°C;

[0036] 3. After the metal is completely melted in the furnace, slagging is carried out to remove impurities in the molten metal;

[0037] 4. Carry out refining, and add conventional deoxidizer in this field to deoxidize before pouring;

[0038] 5. Cast steel ingots, aft...

Embodiment 2

[0045] In this embodiment, an alloy powder for laser cladding remanufacturing of FV520B stainless steel parts with volume damage is provided, which is used for surface damage repair of FV520B stainless steel parts. The chemical composition of the alloy powder is: C: 0.15% ; Cr: 16%; Ni: 5.5%; Mo: 1.4%; Mn: 0.6%; Nb: 0.3%; Cu: 1%; Si: 1.2%;

[0046] The preparation method of the alloy powder is the same as the preparation method involved in Example 1, the difference is only in the mass percentage of each element composition.

Embodiment 3 9

[0048] In the following Table 1, the composition and mass percentage of each element in the alloy powder for volume damage laser cladding remanufacturing of FV520B stainless steel parts from Embodiment 3 to Embodiment 9 of the present invention and the preparation method of the alloy powder are shown. All are the same as the preparation method involved in Example 1, the difference is only in the mass percentage of each element composition (the percentage sign %) is not shown.

[0049] Table 1

[0050]

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Abstract

The invention provides alloy powder used for laser remanufacturing of FV520B martensitic stainless steel parts and a preparation method. The chemical components of the alloy powder include, by weight percentage, 0.01-0.3% of C, 12-17% of Cr, 3-7% of Ni, 0.4-2% of Mo, 0.1-2% of Mn, 0.15-0.55% of Nb, 0-3% of Cu, 0.05-2% of Si, 0-1.6% of B and the balance Fe. The preparation method of the alloy powder is a vacuum melting-high pressure gas atomization method. The alloy powder can have the density and the thermal expansion coefficient which are similar to those of FV520B materials when precipitation hardening elements, deoxygenation slag forming elements and elements used for lowering the martensite phase transformation point are added and the weight percent content of all the elements are regulated; the residual stress level is lowered through the martensite phase transformation accompanying effect; and therefore the problems of cracks, deformation and the like are greatly relieved, and the forming property, the anti-cracking property and the process stability are achieved and improved when the FV520B parts are subjected to laser remanufacturing through the alloy powder.

Description

technical field [0001] The invention belongs to the technical field of alloy powder materials, and in particular relates to alloy powder for laser remanufacturing of FV520B stainless steel parts and a preparation method thereof. Background technique [0002] FV520B is a low-carbon martensitic precipitation-hardening stainless steel, which has the advantages of high strength, good toughness, wear resistance, corrosion resistance and easy processing. It is mainly used for impellers, blades and rotors of large compressors, blowers and aero-engines. Core components. Such parts are usually expensive, and the production cost is extremely high. Due to the harsh working environment, their lifespan is short and they are prone to failure. For example, the large centrifugal compressor blades currently used in the West-East Gas Transmission Under the influence of stress and gas corrosion, the blades are easy to initiate cracks and expand to cause fractures, resulting in overall failure...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C22C38/54C22C38/48B22F1/00B22F9/08C23C24/10
Inventor 董世运方金祥闫世兴宋超群徐滨士冯祥奕刚肖
Owner ACADEMY OF ARMORED FORCES ENG PLA
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