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Preparation method of nickel-aluminum bronze

A nickel-aluminum bronze and copper plate technology, which is applied in the field of marine equipment, can solve the problems of material grain size increase and uneven composition, and achieve the effects of fine and uniform structure, improved comprehensive performance, strength and corrosion resistance

Active Publication Date: 2015-01-28
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Low temperature or short smelting time tends to cause uneven composition, while high temperature or too long smelting time tends to make the grain size of the material larger

Method used

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  • Preparation method of nickel-aluminum bronze
  • Preparation method of nickel-aluminum bronze
  • Preparation method of nickel-aluminum bronze

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Prepare pure copper plate, copper-aluminum alloy block (copper-aluminum mass ratio is 1:1), pure nickel plate, pure iron plate and manganese powder, the masses are 37.4kg, 10.5kg, 2.3kg, 2.2kg and 0.65kg respectively. Before smelting, the surface of the plate is firstly treated to remove oil stains and surface oxide scales, and then the material is put into the furnace, where the copper and aluminum alloys are placed on the top, and the furnace is closed, then vacuumed, and melted at 1250 ° C for 40 minutes. During this period Stir continuously with a stirring rod, open the furnace, sprinkle some slagging agent on top of the solution, and cast into cylindrical molds. After cooling, use a lathe to remove the scale on the surface of the casting until the large inclusions and pores are no longer visible. The tensile sample was cut by electric discharge wire to obtain the national standard cast aluminum bronze 9-4-4-2, and the tensile performance data at room temperature wa...

Embodiment 2

[0027] Other conditions are the same as in Example 1. Non-vacuum smelting is adopted in Example 2. When boiling is reached at 1250° C., some covering powder is sprinkled on the top and smelted for 40 minutes. During this period, stir with a stirring rod constantly, and the covering powder is pulled out before casting. Sprinkle in some slagging powder and cast. figure 1 It shows that nickel-aluminum-bronze alloy with less impurity and less burning loss rate can be successfully obtained by this process. The measured room temperature tensile performance data is:

[0028] Tensile strength: 597MPa, yield strength: 413MPa, elongation: 7.0%, microhardness: 170HV.

Embodiment 3

[0030] Other conditions are the same as in Example 1. In Example 3, the casting line cut by the car is cut into a 50mm × 120mm × 5mm rectangular block, the oil stain on the top is cleaned, and then the surface is smoothed with a grinder, and the surface is subjected to friction stir processing. Aiming at a rotational speed of 2000rpm / min, a processing speed of 150mm / min, and an inclination angle of 3°, argon gas is blown for cooling during processing. The microhardness measured after polishing the surface of the sample is 292HV, but the microstructure of the sample is mainly composed of widmanstatte α and residual β phase (see figure 2 ), with poor corrosion performance. Depend on figure 2 It can be seen that after surface treatment by friction stir processing, a nickel-aluminum bronze with uniform and fine structure is obtained, and the microstructure is mainly composed of Widmanstattenite.

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Abstract

The invention discloses a preparation method of nickel-aluminum bronze. The preparation method comprises the following steps: smelting a pure copper plate, a copper aluminum alloy, a nickel plate, an iron plate and manganese powder in vacuum for 30-60 minutes at 1200-1300 DEG C, performing anti-vacuum casting to obtain cast ingot, and removing the oxides on the surface of the cast ingot; stirring and rubbing the surface of the surface oxide-removed cast ingot; and annealing for 2-6 hours at 500-675 DEG C and then performing air cooling. Compared with the prior art, the comprehensive performance of the nickel-aluminum bronze prepared by a process of combining vacuum smelting anti-vacuum casting, stirring and rubbing processing and thermal treatment is obviously improved; compared with the nickel-aluminum bronze prepared in an anti-vacuum mode, the nickel-aluminum bronze disclosed by the invention is relatively fine and uniform in tissue and obviously improved in strength and corrosion resistance.

Description

technical field [0001] The invention belongs to a material preparation method in the field of marine equipment, and in particular relates to a preparation method of nickel-aluminum bronze. Background technique [0002] Nickel-aluminum bronze is an alloy developed from aluminum bronze. The steady-state binary alloy aluminum bronze contains γ” phase, which has an adverse effect on the mechanical and corrosion resistance of aluminum bronze. Nickel, iron and manganese are added to aluminum bronze Elements can not only inhibit the formation of γ” phase, but also refine the grains. Because of its high strength, good fracture toughness and corrosion resistance, it is the main material for propeller blades, pumps and valves in marine equipment. , Improving its corrosion fatigue performance under complex marine conditions is one of the cores of manufacturing high-performance marine equipment. [0003] At present, the nickel-aluminum bronze used in actual production is generally cast...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C9/01C22F1/08
Inventor 吕玉延吕维洁王立强徐小严毛建伟
Owner SHANGHAI JIAO TONG UNIV
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