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Preparation method of high silicon nickel-copper alloy casting

A technology for alloy castings, high-silicon-nickel-copper, applied in the field of preparation of high-silicon-nickel-copper alloy castings, can solve the problems of limited use, poor processing performance, low plasticity of alloy castings, etc., to reduce internal stress generation and process formability Good, the effect of alloy performance improvement

Active Publication Date: 2015-02-25
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Some domestic departments have also developed similar alloys, but compared with foreign countries in terms of alloy technology and comprehensive performance, there is a big gap in performance
The main problem is that there are serious brown fractures in the castings, and some castings even have the phenomenon of overall fracture, which is difficult to cast and process.
In addition, high-silicon-nickel-copper alloys are mainly used for engine fuel control systems, whose parts have complex shapes and high precision requirements
However, due to the low plasticity and poor processing performance of the alloy castings prepared by the existing technology, the finished product rate of the parts is extremely low, which limits its use.

Method used

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  • Preparation method of high silicon nickel-copper alloy casting

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The alloy is smelted in a 10Kg vacuum induction furnace, and the alloy test rod is cast. The refining temperature is 1450°C, the refining time is 3min, the vacuum degree is 0.1Pa, and the pouring temperature is 1300°C.

[0034] The solidification control process is adopted in the solidification process of the alloy test rod: the initial cooling rate is 120°C / s, after the casting temperature reaches 1000°C, the cooling rate is reduced to 0.04°C / s, when the alloy casting is cooled below 400°C, the casting is naturally After cooling to room temperature, the alloy solidification process curve is as follows figure 1 . The alloy composition of this embodiment is shown in Table 1.

[0035] Table 1 Composition of high-silicon-nickel-copper alloy (wt%)

[0036] chemical composition

Cu

Si

Fe

mn

C

Ni

Content (wt.%)

31.5

3.9

1.98

1.13

0.021

margin

[0037] Table 2 is the tensile properties of the alloy cas...

Embodiment 2

[0049] The alloy composition of this embodiment is shown in Table 4.

[0050] Table 4 Composition of high-silicon-nickel-copper alloy (wt%)

[0051] chemical composition

Cu

Si

Fe

mn

C

Ni

Content (wt.%)

30.9

4.05

2.12

0.98

0.025

margin

[0052] The alloy adopts the solidification control process to cast and form the tensile test bar, and heat treatment at the same time, the process is as follows:

[0053] (1) The alloy is smelted in a 10Kg vacuum induction furnace, and the alloy test rod is cast. The refining temperature is 1480°C, the refining time is 5min, the vacuum degree is 0.1Pa, and the pouring temperature is 1280°C.

[0054] (2) The solidification control process is adopted in the solidification process of the alloy test rod: the initial cooling rate is 150 ° C / s, after the casting temperature reaches 1000 ° C, the cooling rate is reduced to 0.05 ° C / s, when the alloy casting is cooled to belo...

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Abstract

The invention discloses a preparation method of high silicon nickel-copper alloy casting, which comprises the following steps: burdening according to chemical component and ratio of the high silicon nickel-copper alloy, employ a vacuum induction furnace for melting and casting to obtain mother alloy ingot, then employing the vacuum induction furnace for fusing the mother alloy ingot, refining for 3-7 minutes at 1450-1550 DEG C, then cooling to 1260-1320 DEG C for casting, obtaining the alloy casting which gradually approaches to molding; solidifying and controlling, wherein the initial cooling speed is 90-180 DEG C / s, reducing the cooling speed to 0.01-0.1 DEG C / s after the casting temperature reaches 900-1100 DEG C, cooling the alloy casting to less than 400 DEG C, and then naturally cooling to room temperature to obtain the high silicon nickel-copper alloy casting. The preparation method can effectively improve the plasticity and machining performance of the high silicon nickel-copper alloy.

Description

technical field [0001] The invention relates to the technical field of preparation of non-ferrous alloy castings, in particular to a preparation method of high-silicon-nickel-copper alloy castings that can effectively improve the plasticity and machining performance of high-silicon-nickel-copper alloys. Background technique [0002] Nickel-copper alloy (GB5235-38), a type of alloy based on 70 / 30 nickel-copper solid solution, has a long history in engineering applications. The alloy has the characteristics of easy forming, easy brazing, easy cutting, etc., and also has high strength and hardness, and excellent heat resistance and corrosion resistance. Therefore, it is widely used in aviation, navigation, chemical industry, atomic energy, and other fields. [0003] High-silicon-nickel-copper alloy material is a dispersion-strengthened alloy combined with Cu, Fe, Mn and other solid-solution strengthening. The similar grades in Russia are НМКЖМц30-4-2-1, and the corresponding ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03B22D27/04
Inventor 郑启韦华张洪宇王志辉张朝威金涛孙晓峰胡壮麒
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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