CN105925838A

CN105925838A - Production technology for alloy

Info

Publication number: CN105925838A
Application number: CN201610406730.0A
Authority: CN
Inventors: 李国升
Original assignee: Pingdingshan Power Supply Co of State Grid Henan Electric Power Co Ltd
Current assignee: Pingdingshan Power Supply Co of State Grid Henan Electric Power Co Ltd
Priority date: 2013-11-29
Filing date: 2013-11-29
Publication date: 2016-09-07
Anticipated expiration: 2033-11-29
Also published as: CN105925838B; CN105803253A; CN105803253B; CN103643079B; CN103643079A

Abstract

The invention discloses a production technology for an alloy. The alloy is used for a high-power power generator rotor slot wedge and comprises, by weight percent, 2.2 Wt%-2.4 Wt% of Ni, 0.32 Wt%-0.36 Wt% of Cr, 0.55 Wt%-0.60 Wt% of Si, 0.02 Wt%-0.03 Wt% of P and the balance Cu. The technology comprises smelting, casting, solid solution treatment and ageing strengthening. According to the technology, component matching control, technology optimization and multi-phase strengthening conduction are achieved, and the electric conductivity of the obtained alloy material is 62%-65% IACS; at the temperature of 500 DEG C, the tensile strength of the obtained alloy material ranges from 689 MPa to 692 MPa, and the yield strength of the obtained alloy material ranges from 644 MPa to 647 MPa; and the electric conductivity is high, the high-temperature resistance is good, the service life is long, and the using requirement of the alloy for the high-power power generator rotor slot wedge can be met. Meanwhile, the technology is simple, the production cost is low, pollution to the environment is small, and very good market prospects and economic benefits are achieved.

Description

A kind of production technology of alloy

Technical field

The invention belongs to generator amature slot wedge material production technical field, be specifically related to a kind of high-power generator rotor slot wedge By the production technology of alloy.

Background technology

Copper cash, insulating part and self huge centrifugal force in generator amature slot wedge rotor to be born operating time slot, electric current flows through Slot wedge can produce higher temperature rise, needs to use the alloy material that conductivity is high, resistance to elevated temperatures is excellent when producing rotor slot wedge.

In the patent " large-capacity steam turbine generator rotor copper alloy slot wedge and preparation method thereof " of Application No. 200510123011, Alloying component is: Ni:1.35～2.05%, Si:0.40～0.80%, Cr:0.05～0.25%, Be:0.15～0.40%, Cu: surplus；Production technology mainly uses 920～980 DEG C of solution treatment, 35～50% cold deformation, 450～500 DEG C of insulations 4～5h Ageing Treatment, air cooling.In this technical scheme, Be price is high, and affects the high-temperature stability of alloy, makes alloy to hold for a long time By hot operation, the dust of the alloy generation simultaneously adding Be can be poisonous；In alloy, the quality proportioning of Ni, Si is left 2.5～3.5 The right side, Si content is the most higher, and only some Si forms Ni₂Si precipitated phase, remaining Si exists with solid solution state, has a strong impact on conjunction The conductivity of gold；Gained alloy conductive rate is only 49%IACS, and the life-span is short, and resistance to elevated temperatures is unknown.Application No. In the patent " titan bronze for slot wedge on turbo generator rotor and processing technique thereof " of 200510038051.4, titan bronze uses without cobalt Designing without zirconium, its composition is: Be:0.1～0.3%, Ni:1.5～2.5%, Ti:0.4～0.6%, Cu: surplus, gained alloy Conductivity is only 47%IACS, high temperature (427 DEG C) yield strength 480～550MPa, tensile strength 540～630MPa, works the longevity Order short, it is impossible to meet the demand of high-power generator long time running.

Summary of the invention

The present invention is to make up above-mentioned deficiency, and improves composition proportion and production technology, it is provided that the life of a kind of alloy Production. art, this alloy is used for high-power generator rotor slot wedge, and conductivity is high, and resistance to elevated temperatures is good, and the life-span is long, can meet big merit The use requirement of rate generator amature slot wedge alloy, technique is simple simultaneously, and production cost is low, and environmental pollution is little, has relatively Good market prospect and economic benefit.

The production technology of a kind of alloy, this alloy is used for high-power generator rotor slot wedge, the composition of described alloy and content thereof (Wt%) including: Ni 2.2～2.4, Cr 0.32～0.36, Si 0.55～0.60, P 0.02～0.03, Cu: surplus；Including Following steps:

1. melting: first cathode copper is preheated to 250～280 DEG C, reinstalls in Ajax-Wyatt furnace, adds when starting to melt and covers Agent, makes cladding thickness reach 1.2～1.4mm, all add after fusing account for copper mass 0.5～0.7% phosphor-copper as deoxidizer, enter Row is skimmed, and after supplementing coverture, considers the physicochemical property of each element, Si, P, Ni, Cr technique routinely is added copper according to this In melt, insulation 15min comes out of the stove；

2. casting: use conventional continuous casting process, hydraulic press forges into base；

3. solution treatment: heat treatment 1.5h carries out Water Quenching again at 940～960 DEG C, cold rolling makes alloy produce 60% cold change Shape；

4. ageing strengthening: after strand is heated to 460～480 DEG C of insulation 2.5h again, be machined into required form；Described covering The composition of agent and content (Wt%) thereof is: 50% Linesless charcoal, 30% cullet, 10%NaCl, 10%CaF₂。

In the technical program, in terms of composition proportion, Cr can put forward heavy alloyed electrical conductance, forms Cr₃Si phase affects alloy High-temperature stability, and the crystal grain of alloy is grown up during suppressing solution treatment to a certain extent；Because Be and Ni in cuprio₂Si has There is similar mechanical performance, therefore, Ni can be properly increased₂The content of Si, it is thus achieved that preferably heat stability and elevated temperature strength, proportioning The weight/mass percentage composition of Ni and Si is respectively 2.2～2.6%, 0.55～0.65%, it is to avoid containing solid solution state Si in alloy, thus Improve intensity and the conductivity of alloy, both guaranteed the performance of alloy, and reduced production cost, decrease again pollution；And add After Cr, Cr will be first dissolved in Cu than Ni, Si, have the substrate at saturation, improve Ni to a certain extent₂The precipitation of Si phase Amount, in matrix, Ni, Si content reduces, and decreases the degree of distortion of lattice in matrix, improves the conductivity of alloy；Alloy is made to contain The P having weight/mass percentage composition to be 0.02～0.03%, is to, on the basis of alloy will not be made to produce obvious distortion of lattice, produce Raw Ni3P precipitation phase, puies forward heavy alloyed microhardness and tensile strength further, and suppresses precipitated phase to a certain extent Growing up, make alloy substrate obtain purification, conductivity improves.

During alloy melting, selecting Ajax-Wyatt furnace to reduce the melting consumption of copper alloy, cathode copper first preheats before adding in stove, will Si, P, Ni, Cr melt in order, and rational shove charge and fusing order shorten fusing time effectively, and coverture quality proportioning is selected With 50% Linesless charcoal, 30% cullet, 10%NaCl, 10%CaF₂, this coverture spreadability is good, can cover during alloy melting comprehensively Liquid metal liquid level, strong with the affinity of slag, there is fabulous purification liquid metal, the ability of refining alloy, make melt obtain To suitably protecting and obtain preferably melting atmosphere；Add 0.5～0.7% phosphor-copper as deoxidizer, it is possible to effectively remove molten Oxygen particle in body, is effectively improved quality and the yield rate of alloy.

Strand uses high temperature admittedly melt Quenching Treatment, aging of middle temperature processes the method separating out precipitation hardening alloy, and the method produces Technique is simple, it is simple to alloy is convenient for large-scale production.Treatment temperature during solution treatment does not produce coarse grains with alloy Premised on, improve temperature, rapid cooling after held for some time, it is ensured that the solute element of precipitated phase reaches maximum in the base as far as possible Solid solubility.When heat treatment 1.5h carries out Water Quenching, excessive phased soln again at 940～960 DEG C, obtain super saturated solid solution Body, the cold rolling cold deformation making alloy generation bigger, alloy substrate generation recrystallization, make intrinsic silicon produce a large amount of dislocations, alloy Substructure refined, but this working hardening is limited to the intensity contribution of copper alloy, needs Ageing Treatment to strengthen further, Through the Ageing Treatment of 460～480 DEG C of insulation 2.5h, alloying element is the precipitated phase phase of Dispersed precipitate, and precipitation is hardened, and makes Alloy obtains optimal performance.

The technical program is on the basis of common process, by optimizing multicomponent alloy composition, adding trace element, control composition Proportioning is to put forward heavy alloyed intensity, and is avoided as much as or reduces the harmful effect to alloy conductivity, carry out heterogeneous by force Change, gained alloy material, under room temperature, tensile strength 796～798MPa, yield strength 734～737MPa, elongation 17.9～ 18.2%, conductivity 62～65%IACS；At 500 DEG C, tensile strength 689～692MPa, yield strength 644～647MPa, lead Electricity rate is high, and resistance to elevated temperatures is good, and the life-span is long, it is ensured that the security reliability of high-power generator.High-power generator can be met The use requirement of rotor slot wedge alloy, significantly improves the security reliability of high-power generator, and technique is simple simultaneously, produces Low cost, environmental pollution is little, has preferable market prospect and economic benefit.

Specific embodiment

Embodiment one

A kind of high-power generator rotor slot wedge alloy of preparation, respectively composition and the content (Wt%) thereof of group alloy includes: 2.2% Ni, 0.32%Cr, 0.55%Si, 0.02%P, Cu: surplus；

The production technology of described high-power generator rotor slot wedge alloy, comprises the following steps:

1. melting: first cathode copper is preheated to 250 DEG C, reinstalls in Ajax-Wyatt furnace, adds coverture, covers when starting to melt Agent mass component includes 50% Linesless charcoal, 30% cullet, 10%NaCl, 10%CaF₂, make cladding thickness reach 1.2mm, all melt Add after change and account for the phosphor-copper of copper mass 0.5% as deoxidizer, skim, after supplementing coverture, consider each element Physicochemical property, adds in copper melts according to this by Si, P, Ni, Be, Cr technique routinely, and insulation 15min comes out of the stove；

3. solution treatment: heat treatment 1.5h carries out Water Quenching again at 940 DEG C, cold rolling makes alloy produce 60% cold deformation；

4. ageing strengthening: after strand is heated to 460 DEG C of insulation 2.5h again, be machined into required form.

After testing, alloy property is as shown in the table:

Embodiment two

A kind of high-power generator rotor slot wedge alloy of preparation, respectively composition and the content (Wt%) thereof of group alloy includes: 2.4% Ni, 0.36%Cr, 0.60%Si, 0.03%P, Cu: surplus；

1. melting: first cathode copper is preheated to 265 DEG C, reinstalls in Ajax-Wyatt furnace, adds coverture, covers when starting to melt Agent mass component includes 50% Linesless charcoal, 30% cullet, 10%NaCl, 10%CaF₂, make cladding thickness reach 1.3mm, all melt Add after change and account for the phosphor-copper of copper mass 0.6% as deoxidizer, skim, after supplementing coverture, consider each element Physicochemical property, adds in copper melts according to this by Si, P, Ni, Be, Cr technique routinely, and insulation 15min comes out of the stove；

3. solution treatment: heat treatment 1.5h carries out Water Quenching again at 950 DEG C, cold rolling makes alloy produce 60% cold deformation；

4. ageing strengthening: after strand is heated to 470 DEG C of insulation 2.5h again, be machined into required form.

After testing, alloy property is as shown in the table:

Embodiment three

A kind of high-power generator rotor slot wedge alloy of preparation, respectively composition and the content (Wt%) thereof of group alloy includes: 2.6% Ni, 0.40%Cr, 0.65%Si, 0.03%P, Cu: surplus；

1. melting: first cathode copper is preheated to 280 DEG C, reinstalls in Ajax-Wyatt furnace, adds coverture, covers when starting to melt Agent mass component includes 50% Linesless charcoal, 30% cullet, 10%NaCl, 10%CaF₂, make cladding thickness reach 1.4mm, all melt Add after change and account for the phosphor-copper of copper mass 0.7% as deoxidizer, skim, after supplementing coverture, consider each element Physicochemical property, adds in copper melts according to this by Si, P, Ni, Be, Cr technique routinely, and insulation 15min comes out of the stove；

3. solution treatment: heat treatment 1.5h carries out Water Quenching again at 960 DEG C, cold rolling makes alloy produce 60% cold deformation；

4. ageing strengthening: after strand is heated to 480 DEG C of insulation 2.5h again, be machined into required form.

After testing, alloy property is as shown in the table:

Shown by above three embodiment, use the technical program, gained alloy material, under room temperature, tensile strength 796～ 798MPa, yield strength 734～737MPa, elongation 17.9～18.2%, conductivity 62～65%IACS；At 500 DEG C, tension Intensity 689～692MPa, yield strength 644～647MPa, conductivity is high, and resistance to elevated temperatures is good, and the life-span is long, can meet high-power The use requirement of generator amature slot wedge alloy, it is ensured that the security reliability of high-power generator.

Claims

1. the production technology of an alloy, it is characterised in that: this alloy is used for high-power generator rotor slot wedge, described alloy Composition and content (Wt%) thereof including: Ni 2.2～2.4, Cr 0.32～0.36, Si 0.55～0.60, P 0.02～0.03, Cu: surplus；Comprise the following steps: