CN101477073A - Fast detection method for aluminum alloy hardenability by electro-conductibility - Google Patents
Fast detection method for aluminum alloy hardenability by electro-conductibility Download PDFInfo
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- CN101477073A CN101477073A CNA2009100766274A CN200910076627A CN101477073A CN 101477073 A CN101477073 A CN 101477073A CN A2009100766274 A CNA2009100766274 A CN A2009100766274A CN 200910076627 A CN200910076627 A CN 200910076627A CN 101477073 A CN101477073 A CN 101477073A
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Abstract
The invention provides a method for rapidly detecting the hardenability of aluminum alloy by utilizing electrical conductivity. The method comprises the following steps that: an aluminum alloy material comprises an aluminum alloy board or forging; after the aluminum alloy material is subjected to solution treatment, the solid-solution state aluminum alloy material is subjected to end quenching treatment; the electrical conductivity of the positions on the solid-solution state aluminum alloy material after end quenching treatment is measured, wherein the positions are at different distances from an end quenching surface where a quenching end is; and by taking a distance from the quenching end as abscissa and taking the electrical conductivity of the positions at different distances from the quenching surface as ordinate, the measured electrical conductivity of the positions at different distances from the quenching surface is connected into a curve so as to determine the hardenability of the aluminum alloy material. Due to the detection method, the hardenability of wrought aluminum alloy can be rapidly and accurately evaluated.
Description
Technical field
The present invention relates to a kind of method of utilizing conductivity fast detecting wrought aluminium alloy quenching degree.
Background technology
Al-Zn-Mg-Cu and Al-Cu-Mg line aluminium alloy belong to 7000 respectively, are typical ageing strengthening aluminium alloys, have a wide range of applications at aerospace field.But major part ageing strengthening aluminium alloy needs at first to carry out solution treatment before timeliness thermal treatment.Solution treatment whether fully directly have influence on follow-up timeliness thermal treatment, and then have influence on the final performance of alloy.Since aluminium alloy coefficient of heat conductivity height, rapid heat dissipation, and there is not the problem of quenching degree in the aluminum alloy junction member that therefore has the small bore size.But the fast development of aerospace industry requires to adopt monoblock high strength alumin ium alloy slab or stamp work to substitute traditional riveting parts as load spare.Therefore, the also the same problem that is faced with a quenching degree of high strength alumin ium alloy with steel.Sheet alloy, forging thickness are thick more, and the quenching degree problem is serious more.Therefore, set up a cover and be applicable to the appraisement system of heavy in section size distortion aluminum alloy hardenability, all significant for the heat treatment regime of the selection of aerospace industry, aluminium alloy.
The quenching degree of so-called aluminium alloy is meant that alloy is through keeping the ability of solid solution structure after the solution treatment in quenching process.Because aluminium alloy has higher coefficient of heat conductivity, therefore when alloy thickness during less than 60mm, alloy generally can both obtain solid solution structure completely in quenching process, and can not produce the phenomenon of " it is not saturating to quench ".Along with the alloy sectional dimension increase, in the quenching process after solid solution, the not saturating phenomenon of quenching appears in the heart portion of alloy probably, thereby influences the follow-up ag(e)ing process and the mechanical property of alloy.
Summary of the invention
Purpose of the present invention just is to develop a kind of method of utilizing conductivity fast detecting aluminum alloy hardenability.
To achieve these goals, the present invention takes following technical scheme:
A kind of method of utilizing conductivity fast detecting aluminum alloy hardenability, this method comprises the steps:
(1), aluminum alloy materials quenching degree is detected, this aluminum alloy materials comprises aluminum alloy plate materials or forging;
(2), aluminum alloy materials is through after the solution treatment, the aluminum alloy materials of solid solution attitude is carried out end quenching handles;
(3), the aluminum alloy materials of the solid solution attitude after handling for end quenching, measure its conductivity apart from the position of the end quenching face different distance at quenched end place;
(4), the distance with the distance quenched end is a horizontal ordinate, with the conductivity on the position of distance end quenching face different distance is ordinate, the conductivity of measuring in the step (3) apart from the position of end quenching face different distance is connected into curve, thereby determine the quenching degree of aluminum alloy materials.
The conductivity of solid solution aging enhanced type aluminium alloy and the solid solution degree of alloy have substantial connection.The solid solution degree is abundant more in the alloy, and the distortion of lattice of alloy is serious more, and the obstruction degree that electron motion is subjected to is just big more, is reflected in that to show as conductivity values on the conductivity low more; Otherwise when the alloy solid solution degree is more little, distortion of lattice is also just more little, and the suffered resistance of the motion of electronics between lattice is just more little, is reflected in that to show as conductivity values on the conductivity high more.When the quenching degree of alloy was better, in quenching process, the whole solid solution degree of alloy was close, so the conductivity variations of alloy different parts is little; Otherwise if alloy quenching degree is relatively poor, in quenching process, it is just poor more that alloy heart portion keeps the ability of solid solution structure, so distortion of lattice is more little, and the resistance that electron motion is subjected to is just more little, thereby conductivity is high more.Utilize this variation characteristics of conductivity, can detect the quenching degree of aluminium alloy fast and effectively.
In described step (1), described aluminum alloy plate materials or forging are to obtain through hot rolling or open die forging or die forging.
In described step (2), the solution heat treatment of described solution treatment under 400～550 ℃ of conditions, carrying out, and after solution heat treatment, carry out the timeliness heat treatment reinforcement again.
In described step (2), salt bath solution treatment or resistance furnace solution treatment are adopted in solution treatment.
In described step (3), the measurement of conductivity is from the end quenching face, measures conductivity on every plane apart from end quenching face 3～5mm; Conductivity measurement is carried out according to corresponding GB; For the aluminum alloy materials of the solid solution attitude after the same end quenching processing, its testing length is not less than 60mm, and promptly the last plan range from the end quenching face to measured conductivity is not less than 60mm.
Solution treatment is a kind of important means that improve aluminium alloy capability, utilizes the quenching degree of conductivity indices fast detecting aluminium alloy, for selecting suitable hardening media, improves Technology for Heating Processing, and the quenching degree that improves aluminium alloy has significance.The present invention is directed to wrought aluminium alloy quenching degree detection method and carried out number of research projects, obtained certain test figure, result of study shows, adopt method of the present invention aluminium alloy to be carried out the evaluation of quenching degree, can estimate out the quenching degree of aluminium alloy quickly and efficiently, thereby provide technical support for aerospace industry selection and aluminium alloy optimization of Heat Treatment Process.
A kind of advantage of the method for conductivity fast detecting wrought aluminium alloy quenching degree of utilizing that the present invention relates to is:
(1), operation is simple for method of the present invention.Can utilize portable conductivity meter to detect in real time.
(2), method of the present invention detects fast effectively.The conductivity test requires low to sample surfaces, the conductivity values that records can reflect the quenching degree variation tendency of material effectively, thereby can estimate the quenching degree of aluminium alloy apace.
Description of drawings
Fig. 1 is for adopting method of the present invention to 7B04 and 7150 aluminum alloy hardenability appraisal curves.
Fig. 2 is for getting the synoptic diagram of cylindric sample along the aluminium alloy thick plate thickness direction.
Fig. 3 is the cylindric sample synoptic diagram of cutting.
Fig. 4 is for being cut into cylindric sample the synoptic diagram of the slice of cylinder of equal height.
Embodiment
The present invention mainly may further comprise the steps:
(1), aluminium alloy cast ingot become through hot rolling or open die forging or die forging and have certain thickness aluminum alloy materials (〉=60mm);
(2), (thickness direction of 〉=60mm) aluminum alloy materials is got the cylindric sample that a diameter is 50mm along having certain thickness.It materialses process as shown in Figure 2, gets the cylindric sample 2 that a diameter is 50mm along the thickness direction of aluminum alloy materials 1, and wherein, the cylinder height of cylindric sample 2 equals the thickness of aluminum alloy materials 1.
(3), sample is put into the solid solution stove and carried out solution treatment;
(4), behind molten the finishing, sample is transferred to the end quenching platform rapidly carry out end quenching and handle.Require hardening media to spray to an end face of sample from bottom to top below sample, hardening media should cover sample fully and can not be splashed to other positions of sample.
(5), after the sample cooling, begin from the end quenching face, along short transverse, adopt the per 3～5mm length intercepting of the mode disk of line cutting, as shown in Figure 3, Figure 4, the face bottom of right cylinder sample 2 is the end quenching face, be benchmark with the end quenching face, one section of every h altitude line cutting intercepting, distance between every line of cut 8 is that h highly is identical, like this, right cylinder sample 2 is cut into the slice of cylinder 3 that several have identical h height, the h of each slice of cylinder 3 highly is 3～5mm (Fig. 4 is a synoptic diagram, figure draw 4 slice of cylinder).As shown in Figure 4, on the top face 7 of end quenching face, cut surface 4,5,6 and right cylinder sample 2, measure conductivity value, and be depicted as curve; The measurement of conductivity is carried out according to corresponding national standards.
Embodiment 1:
7B04 and 7150 aluminium alloy thick plates have a wide range of applications in aircraft manufacturing, wherein 7150 aluminium alloys are high purity aluminum alloy, be one of aluminum alloy materials first-selected in the type aircraft, the quenching degree of therefore studying alloy plate has significance for the safety that guarantees aircraft.For 7B04 and 7150 aluminium alloy thick plates (thickness is 150mm), by the mode of aforesaid sampling, cut-off directly is the cylindric sample of 50mm respectively; And respectively the sample of being got is carried out solid solution, the solid solution system adopts 450 ℃ of following solid solutions 3 hours respectively, carries out shrend afterwards respectively; After the sample cooling, the right cylinder sample is cut into 30 5mm slice of cylinder highly respectively, on the top face of end quenching face, cut surface and right cylinder sample, measures conductivity value respectively, and be depicted as curve; The measurement of conductivity is carried out according to corresponding national standards.Fig. 1 is that thickness is the conductivity curve of end quenching after thick 7B04 aluminium alloy thick plate of 150mm and the solution treatment of 7150 aluminium alloy thick plates process.As seen from Figure 1, along with the increase of distance quenched end distance, 7B04 alloy quenching attitude conductivity increases sharply, and the amplitude of variation is big; And under identical quenching condition, the amplification of 7150 aluminium alloy quenching attitude conductivity values is little, illustrates that the quenching degree of 7150 alloys is better than the 7B04 aluminium alloy.By to the conductivity tracing analysis, for the 7B04 alloy, the depth capacity of shrend is 20mm, and the maximum through hardening thickness of workpiece is about 40mm; The full hardening deepness of 7150 alloys is 55mm, and the maximum through hardening thickness of workpiece is about 110mm.
Claims (5)
1, a kind of method of utilizing conductivity fast detecting aluminum alloy hardenability, it is characterized in that: this method comprises the steps:
(1), aluminum alloy materials quenching degree is detected, this aluminum alloy materials comprises aluminum alloy plate materials or forging;
(2), aluminum alloy materials is through after the solution treatment, the aluminum alloy materials of solid solution attitude is carried out end quenching handles;
(3), the aluminum alloy materials of the solid solution attitude after handling for end quenching, measure its conductivity apart from the position of the end quenching face different distance at quenched end place;
(4), the distance with the distance quenched end is a horizontal ordinate, with the conductivity on the position of distance end quenching face different distance is ordinate, the conductivity of measuring in the step (3) apart from the position of end quenching face different distance is connected into curve, thereby determine the quenching degree of aluminum alloy materials.
2, the method for utilizing conductivity fast detecting aluminum alloy hardenability according to claim 1 is characterized in that: in described step (1), described aluminum alloy plate materials or forging are to obtain through hot rolling or open die forging or die forging.
3, the method for utilizing conductivity fast detecting aluminum alloy hardenability according to claim 1 and 2, it is characterized in that: in described step (2), the solution heat treatment of described solution treatment under 400～550 ℃ of conditions, carrying out, and after solution heat treatment, carry out the timeliness heat treatment reinforcement again.
4, the method for utilizing conductivity fast detecting aluminum alloy hardenability according to claim 1 and 2 is characterized in that: in described step (2), salt bath solution treatment or resistance furnace solution treatment are adopted in solution treatment.
5, the method for utilizing conductivity fast detecting aluminum alloy hardenability according to claim 1 and 2, it is characterized in that: in described step (3), the measurement of conductivity is from the end quenching face, measures conductivity on every plane apart from end quenching face 3～5mm; Conductivity measurement is carried out according to corresponding GB; For the aluminum alloy materials of the solid solution attitude after the same end quenching processing, its testing length is not less than 60mm, and promptly the last plan range from the end quenching face to measured conductivity is not less than 60mm.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101788438B (en) * | 2010-01-27 | 2011-08-17 | 湖南大学 | Experimental method for measuring harden ability of large-sized aluminium alloy |
| CN101929967B (en) * | 2010-01-19 | 2012-06-06 | 南京钢铁股份有限公司 | Method for detecting Nb (C, N) dissolving temperature of low-carbon microalloy steel by resistivity |
| CN104297300A (en) * | 2014-10-23 | 2015-01-21 | 西南铝业（集团）有限责任公司 | Method for determining head and tail reference saw cutting quantity of aluminum alloy round ingot |
| CN109536859A (en) * | 2018-10-24 | 2019-03-29 | 郑州明泰实业有限公司 | The method for quickly adjusting production technology by 7075 alloyed aluminum solution hardening effect of on-line checking |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2834658B2 (en) * | 1993-12-02 | 1998-12-09 | 住友ベークライト株式会社 | Conductive resin paste for semiconductors |
| CN1250749C (en) * | 2002-08-08 | 2006-04-12 | 上海交通大学 | Tail end quenching equipment of medium-high hardenability steel and hardenability testing method |
| CN101206167A (en) * | 2006-12-18 | 2008-06-25 | 北京有色金属研究总院 | Method for detecting high-strength distorted aluminium alloy thick plate hardenability |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101929967B (en) * | 2010-01-19 | 2012-06-06 | 南京钢铁股份有限公司 | Method for detecting Nb (C, N) dissolving temperature of low-carbon microalloy steel by resistivity |
| CN101788438B (en) * | 2010-01-27 | 2011-08-17 | 湖南大学 | Experimental method for measuring harden ability of large-sized aluminium alloy |
| CN104297300A (en) * | 2014-10-23 | 2015-01-21 | 西南铝业（集团）有限责任公司 | Method for determining head and tail reference saw cutting quantity of aluminum alloy round ingot |
| CN109536859A (en) * | 2018-10-24 | 2019-03-29 | 郑州明泰实业有限公司 | The method for quickly adjusting production technology by 7075 alloyed aluminum solution hardening effect of on-line checking |
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Effective date of registration: 20190628 Address after: 101407 No. 11 Xingke East Street, Yanqi Economic Development Zone, Huairou District, Beijing Patentee after: Research Institute of engineering and Technology Co., Ltd. Address before: 100088, 2, Xinjie street, Beijing Patentee before: General Research Institute for Nonferrous Metals |
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