CN105506323A

CN105506323A - Performance improving method for Cu-Ni-Al alloy

Info

Publication number: CN105506323A
Application number: CN201410504683.4A
Authority: CN
Inventors: 杨佳
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-09-26
Filing date: 2014-09-26
Publication date: 2016-04-20

Abstract

The invention discloses a performance improving method for a Cu-Ni-Al alloy. Smelting is carried out in a frequency induction furnace; electrolytic Cu, Ni blocks, iron nails, a Cr-Fe intermediate alloy and pure Al ingots are sequentially added into the furnace; the smelting temperature is about 1400 DEG C; and pouring is carried out at the temperature of about 1300 DEG C. In the Cu-17Ni-3Al alloy, the element Fe is added, so that grains of the alloy can be refined, and the distance between secondary dendrites is reduced; Fe and Cr are added simultaneously, so that the distance between secondary dendrites and the grain size of the alloy are remarkably reduced, and the mechanical performance of the Cu-17Ni-3Al alloy can be improved; and the tensile strength of the alloy in which Fe and Cr are added simultaneously can reach 795 MPa, and the hardness (HBS) is 269.

Description

A kind of Cu-Ni-Al system alloy property method for improving

Technical field

The present invention relates to a kind of Cu-Ni-Al system alloy property method for improving, belong to alloy property optimisation technique field.

Background technology

Cu-Ni alloy has excellent mechanical property, conductivity, corrosion resistance nature, resistance toheat etc., is widely used in the industry such as shipbuilding, oil, chemical industry, electrical instrument, medicine equipment.The research of Cu-Ni alloy is mainly concentrated both ways: one is the copper alloy with high strength and high conductivity that is representative with Cu-Ni-Si and Cu-Ni-Sn alloy, is applied to lead frame, elastic element etc. mainly as electrical material; Two is high-strength, the Vulcan metals based on Cu-10Ni, Cu-30Ni etc., is mainly used in various heat exchanger and water pipe.Large quantity research shows, in Cu-Ni alloy, add Al, can make to form Ni3Al in αsolidsolution, reaches the effect of strengthening matrix, significantly improves intensity and the hardness of alloy.Initial research shows, in Cu-15Ni alloy, add the Al of 3%, the mechanical property of alloy is greatly enhanced.Also have research think Cu and Ni ratio be about 10: 1 Cu-Ni alloy there is best over-all properties.In order to improve the performance of aluminium White brass alloy further, interpolation different-alloy element is an important approach.The elements such as Mn, Fe, Cr, Nb are added on Cu-19Ni-1.8Al alloy basis, and make tensile strength reach 930MPa, yield strength reaches 750MPa, and elongation reaches 18%.For Cu-(4.7 ~ 9.4) Ni-(1 ~ 3) Al alloy, adds Ti and Ni3Al can be suppressed when ageing treatment to separate out at the discontinuous precipitation of grain boundaries, thus put forward heavy alloyed mechanical property.After deformation processing and thermal treatment, the intensity of alloy can reach 1185MPa, and hardness (HBS) is 280.In Cu-(2 ~ 6) Ni-(1 ~ 3) add Si in Al alloy, make the tensile strength of alloy reach 860MPa, hardness (HBS) is 272.

At present, the research both at home and abroad for aluminium White brass alloy mainly concentrates on distortion aluminium copper-nickel alloy, and the acquisition of material excellent mechanical performance relies on viscous deformation and follow-up thermal treatment process thereof, and in addition, Ni content or the Al content of this kind of distortion aluminium copper-nickel alloy are all lower.In fact, by suitable Composition Design and process optimization, the White brass alloy with high Ni and high Al content also can be applicable to some occasions needing to have excellent anticorrosive performance and wear resisting property.As based on Cu-17Ni-3Al alloy, by adding multiple alloying element, a kind of cast copper alloy more excellent than conventional wear-resistant copper alloy (as albronze QAl 10-4-4-4-4) wear resisting property can be obtained.But the impact of the micro-alloy performance of adding in this alloy also needs to carry out deep research.

Summary of the invention

The problem to be solved in the present invention: a kind of Cu-Ni-Al system alloy property method for improving is provided, is intended to put forward heavy alloyed performance, to meet industrial requirements.

Technical scheme of the present invention:

A kind of Cu-Ni-Al system alloy property method for improving, melting is carried out in frequency induction furnace, be sequentially added into electrolysis Cu, Ni block, iron nail, Cr-Fe master alloy and pure Al ingot, smelting temperature is about 1400 DEG C, and pours into a mould at about 1300 DEG C.

Described Fe counts 1.2% with massfraction.

Described Cr counts 0.85% with massfraction.

Beneficial effect of the present invention:

In Cu-17Ni-3Al alloy, adding Fe element can the grain-size of refining alloy and secondary dendrite arm spacing, add Fe and Cr simultaneously, in alloy except secondary dendrite arm spacing and grain-size significantly reduce, add the mechanical property that Fe and Cr can improve Cu-17Ni-3Al alloy, the strength of alloy simultaneously adding Fe and Cr can reach 795MPa, and hardness (HBS) is 269.

embodiment:

Embodiment:

Alloy melting carries out in medium-frequency induction furnace, be sequentially added into electrolysis Cu, Ni block, iron nail, Cr-Fe master alloy and pure Al ingot, melting amount is 30kg, smelting temperature is about 1400 DEG C, be poured in metal mold at about 1300 DEG C, obtain the sample of the different 60mm × 130mm of 3 kinds of compositions, the Cu-17Ni-3Al alloying constituent after spectroscopic analysis is in table 1.

Sample all takes from position, ingot casting concentrically ringed outer with Linear cut.Tensile property is measured sample and is adopted diameter to be 8mm, and gauge length is the pole of 40mm, tests and carries out on CMT5105 electronic universal tester, and draw speed is 2mm/min, gets the mean value of 3 samples.Hardness test is carried out on HB-3000 Brinell tester, and select diameter to be the steel ball of 5mm, pressure is 7355N, pressurize 30s, gets the flat value of 5 points.

Table 2 is the mechanical property of 3 kinds of alloys.As can be known from Table 2, the tensile strength of No. 3 alloys is the highest, reaches 795MPa; The tensile strength of No. 2 alloys is 786MPa; The tensile strength of No. 1 alloy is minimum.Add the reduction that Fe and Cr causes No. 1 alloy elongation, wherein the elongation of No. 3 alloys is 4.7%, reduces 14.5%, reduce 39.0% than the elongation of No. 1 alloy than No. 2 alloys.

Table 3 is the hardness of 3 kinds of alloys.As can be seen from Table 3, add Fe, Cr and all improve the hardness of alloy and the hardness of matrix, particularly add Fe and Cr simultaneously, the hardness of alloy (HBS) can be made to reach 269.

Table 4 is secondary dendrite arm spacing and the average grain size of 3 kinds of alloys.As known from Table 4, the secondary dendrite arm spacing of No. 2 alloys and average grain size are than No. 1 alloy difference little 43% and 41%, and the secondary dendrite arm spacing of No. 3 alloys and average grain size are than No. 1 alloy difference little 43% and about 59%.

Claims

1. a Cu-Ni-Al system alloy property method for improving, it is characterized in that: in frequency induction furnace, carry out melting, be sequentially added into electrolysis Cu, Ni block, iron nail, Cr-Fe master alloy and pure Al ingot, smelting temperature is about 1400 DEG C, and pours into a mould at about 1300 DEG C.

2. a kind of Cu-Ni-Al system according to claim 1 alloy property method for improving, is characterized in that: described Fe counts 1.2% with massfraction.

3. a kind of Cu-Ni-Al system according to claim 1 alloy property method for improving, is characterized in that: described Cr counts 0.85% with massfraction.