CN103484739A

CN103484739A - Al-Cu-Mg-Mn series high-strength heat-resistant aluminum alloy section and manufacture method thereof

Info

Publication number: CN103484739A
Application number: CN201310348509.0A
Authority: CN
Inventors: 徐兴洪
Original assignee: Anhui Shengda Qianliang Aluminum Co Ltd
Current assignee: Jiangyin Xiehong Metal Products Co ltd
Priority date: 2013-08-12
Filing date: 2013-08-12
Publication date: 2014-01-01
Anticipated expiration: 2033-08-12
Also published as: CN103484739B

Abstract

The invention discloses an Al-Cu-Mg-Zr series high-strength heat-resistant aluminum alloy section and a manufacture method thereof. The alloy comprises the following elements in mass percentage: 3.5 to 4.2% of Cu, 0.3 to 0.4% of Mg, 0.3 to 0.4% of Zr, 0.2 to 0.3% of Mn, 0.08 to 0.12% of Mo, 0.03 to 0.05% of Ni, 0.04 to 0.08% of Ti, 0.02 to 0.03% of V, 0.03 to 0.04% of B, 0.02 to 0.03% of Fe, 0.04 to 0.07% of Ce, 0.03 to 0.05% of Er, 0.05 to 0.08% of Nd, and the balance of Al. The manufactured aluminum alloy has high strength, is outstanding in heat resistance and difficult to deform, and can be used for a long time at a relatively high temperature.

Description

A kind of Al-Cu-Mg-Mn is high strength heat resistant alloy section bar and manufacture method thereof

Technical field

The present invention relates to a kind of Al-Cu-Mg-Mn is high strength heat resistant alloy section bar and manufacture method thereof, belongs to the aluminum alloy materials technical field.

Background technology

Al-Cu-Mg is associated gold because having medium tenacity and resistance to elevated temperatures, this alloy is mainly used in being no more than the Working environment of 100 ℃, when surpassing this temperature, because its strengthening phase generation alligatoring significantly descends performance, therefore, needing a kind of new Al-Cu-Mg of exploitation is that high strength heat resistant alloy is to meet the higher temperature requirement.

Summary of the invention

The object of the present invention is to provide a kind of Al-Cu-Mg-Mn is the production technique of high strength heat resistant alloy section bar, improves the mechanical behavior under high temperature of alloy.

For achieving the above object, the technical solution used in the present invention is as follows:

A kind of Al-Cu-Mg-Zr is the high strength heat resistant alloy section bar, its each element consists of by mass percentage: Cu 3.5-4.2%, Mg 0.3-0.4%, Zr 0.3-0.4%, Mn 0.2-0.3%, Mo 0.08-0.12%, Ni 0.03-0.05%, Ti 0.04-0.08, V 0.02-0.03%, B 0.03-0.04%, Fe 0.02-0.03, Ce 0.04-0.07%, Er 0.03-0.05%, Nd 0.05-0.08%, surplus is Al.

Al-Cu-Mg-Zr is the manufacture method of high strength heat resistant alloy section bar: by above-mentioned alloying constituent, the furnace charge prepared is dropped into to smelting furnace, be heated to 740-760 ℃, treat that metal all melts, stir 25-35 minute, detect alloying constituent and adjust; Then add refining agent to carry out refining, refining temperature is 720-740 ℃, and refining time is 15-20 minute, standing 20-30 minute after refining, start casting after skimming, casting temp is 705-715 ℃, casting speed is 70-80mm/min, and cooling water flow is 1600-1800 L/min; Alloy cast ingot first is warming up to 160-180 ℃ with 80-90 ℃/h, insulation 3-4 hour, be warming up to 310-330 ℃ with 60-80 ℃/h again, insulation 2-3 hour, be warming up to 420-440 ℃ with 40-50 ℃/h again, insulation 6-8 hour, and then be warming up to 510-530 ℃ with 35-45 ℃/h, insulation 10-15 hour, finally be down to rapidly room temperature with the speed of cooling of 200-250 ℃/h; Then ingot casting is heated to 450-470 ℃, uses the extrusion machine extrusion molding, extruding rate is 6-10m/min; Aluminium alloy extrusions after extrusion molding is warming up to 530-540 ℃ with 150-180 ℃/h, insulation 40-60 minute; Be cooled to 160-190 ℃ with 300-330 ℃/h again, insulation 1-2 hour, then put into 0-3 ℃ of icy salt solution and be down to rapidly below 50 ℃; The aluminium alloy extrusions that then will take out from salt solution first is warming up to 160-180 ℃ with 70-80 ℃/h, insulation 1-2 hour; Be cooled to 60-70 ℃ with 50-60 ℃/h again, insulation 60-70 hour, finally be warming up to 160-180 ℃ with 40-50 ℃/h, and insulation 10-15 hour, obtain aluminium alloy extrusions of the present invention.

Described refining agent preparation method is as follows: a. takes the raw material of following weight part: Repone K 5-10, sodium-chlor 8-12, aluminum fluoride 5-10, magnesium nitride 8-12, titanium boride 4-8, sodium aluminum fluoride 10-15, wollastonite 4-8, wilkinite 3-5; B. above-mentioned sodium aluminum fluoride, wollastonite, wilkinite were pulverized to the 300-400 mesh sieve, after mixing, add the aluminium nitride of 2-3%, the Di(dioctylpyrophosphato) ethylene titanate of 0.5-1%, the nano-sized carbon of 1-2%, the Zinic stearas of 1-1.5%, 2000-3000rpm high-speed stirring 10-15min, take out and dry, under 1200-1600 ℃, calcine 2-3h, then shrend is cooling, grind, stand-by; C. by all the other each heating raw materials to 750-800 ℃, after its whole meltings, the clarification 1-2h, top clear liquor is poured into water to cold quenching, obtain broken particle, porphyrize is crossed the 200-400 mesh sieve, stand-by; D. mixing of materials step b, c obtained stirs and obtains described refining agent.

Beneficial effect of the present invention:

The present invention adds the elements such as micro-Zr, Mn in the Al-Cu-Mg of high Cu/Mg ratio, makes alloy separate out a kind of new ageing strengthening phase, can improve mechanical behavior under high temperature and the thermostability of alloy; Multistage aging of the present invention can improve the distribution of strengthening phase at crystal boundary while processing, thereby carries heavy alloyed intensity and elongation.The aluminium alloy that the present invention makes, not only intensity is high, and good heat resistance, not yielding, can comparatively high temps under life-time service.

Embodiment

Al-Cu-Mg-Zr is the manufacture method of high strength heat resistant alloy section bar: by above-mentioned alloying constituent, the furnace charge prepared is dropped into to smelting furnace, be heated to 750 ℃, treat that metal all melts, stir 30 minutes, detect alloying constituent and adjust; Then add refining agent to carry out refining, refining temperature is 735 ℃, and refining time is 18 minutes, after refining standing 25 minutes, start casting after skimming, and casting temp is 710 ℃, and casting speed is 75mm/min, and cooling water flow is 1750L/min; Alloy cast ingot first is warming up to 170 ℃ with 85 ℃/h, be incubated 3 hours, be warming up to 320 ℃ with 70 ℃/h again, be incubated 2 hours, be warming up to 430 ℃ with 50 ℃/h again, be incubated 7 hours, and then be warming up to 520 ℃ with 40 ℃/h, be incubated 12 hours, finally with the speed of cooling of 240 ℃/h, be down to rapidly room temperature; Then ingot casting is heated to 460 ℃, uses the extrusion machine extrusion molding, extruding rate is 8m/min; Aluminium alloy extrusions after extrusion molding is warming up to 530 ℃ with 160 ℃/h, is incubated 60 minutes; Be cooled to 175 ℃ with 320 ℃/h again, be incubated 1.5 hours, then put into 1 ℃ of icy salt solution and be down to rapidly below 50 ℃; The aluminium alloy extrusions that then will take out from salt solution first is warming up to 180 ℃ with 70 ℃/h, is incubated 1 hour; Be cooled to 70 ℃ with 60 ℃/h again, be incubated 60 hours, finally with 45 ℃/h, be warming up to 180 ℃, be incubated 10 hours, obtain aluminium alloy extrusions of the present invention.

Described refining agent preparation method is as follows: a. takes the raw material of following weight (kg): Repone K 8, sodium-chlor 10, aluminum fluoride 6, magnesium nitride 10, titanium boride 6, sodium aluminum fluoride 12, wollastonite 6, wilkinite 4; B. above-mentioned sodium aluminum fluoride, wollastonite, wilkinite were pulverized to 300 mesh sieves, after mixing, add 2% aluminium nitride, 0.6% Di(dioctylpyrophosphato) ethylene titanate, 1% nano-sized carbon, 1% Zinic stearas, 2000rpm high-speed stirring 15min, take out and dry, under 1350 ℃, calcine 2h, then shrend is cooling, grind, stand-by; C. by all the other each heating raw materials to 780 ℃, after its whole meltings, clarification 1h, be poured into water cold quenching by top clear liquor, obtains broken particle, and porphyrize is crossed 300 mesh sieves, stand-by; D. mixing of materials step b, c obtained stirs and obtains described refining agent.

Through the check mechanical property, be: tensile strength 589Mpa, yield strength is 465Mpa, elongation is 13.2%.

Claims

1. an Al-Cu-Mg-Zr is the high strength heat resistant alloy section bar, it is characterized in that: its each element consists of by mass percentage: Cu 3.5-4.2%, Mg 0.3-0.4%, Zr 0.3-0.4%, Mn 0.2-0.3%, Mo 0.08-0.12%, Ni 0.03-0.05%, Ti 0.04-0.08, V 0.02-0.03%, B 0.03-0.04%, Fe 0.02-0.03, Ce 0.04-0.07%, Er 0.03-0.05%, Nd 0.05-0.08%, surplus is Al.

2. Al-Cu-Mg-Zr as claimed in claim 1 is the manufacture method of high strength heat resistant alloy section bar, it is characterized in that: by above-mentioned alloying constituent, the furnace charge prepared is dropped into to smelting furnace, be heated to 740-760 ℃, treat that metal all melts, stir 25-35 minute, detect alloying constituent and adjust; Then add refining agent to carry out refining, refining temperature is 720-740 ℃, and refining time is 15-20 minute, standing 20-30 minute after refining, start casting after skimming, casting temp is 705-715 ℃, casting speed is 70-80mm/min, and cooling water flow is 1600-1800 L/min; Alloy cast ingot first is warming up to 160-180 ℃ with 80-90 ℃/h, insulation 3-4 hour, be warming up to 310-330 ℃ with 60-80 ℃/h again, insulation 2-3 hour, be warming up to 420-440 ℃ with 40-50 ℃/h again, insulation 6-8 hour, and then be warming up to 510-530 ℃ with 35-45 ℃/h, insulation 10-15 hour, finally be down to rapidly room temperature with the speed of cooling of 200-250 ℃/h; Then ingot casting is heated to 450-470 ℃, uses the extrusion machine extrusion molding, extruding rate is 6-10m/min; Aluminium alloy extrusions after extrusion molding is warming up to 530-540 ℃ with 150-180 ℃/h, insulation 40-60 minute; Be cooled to 160-190 ℃ with 300-330 ℃/h again, insulation 1-2 hour, then put into 0-3 ℃ of icy salt solution and be down to rapidly below 50 ℃; The aluminium alloy extrusions that then will take out from salt solution first is warming up to 160-180 ℃ with 70-80 ℃/h, insulation 1-2 hour; Be cooled to 60-70 ℃ with 50-60 ℃/h again, insulation 60-70 hour, finally be warming up to 160-180 ℃ with 40-50 ℃/h, and insulation 10-15 hour, obtain aluminium alloy extrusions of the present invention.