Method suitable for directly testing and evaluating quenching effect of aluminum alloy material

An aluminum alloy material and aluminum alloy technology, which is applied in the preparation of test samples, analysis materials, and test material hardness, etc., can solve the problems of large waste, difficult operation, and difficulty in measuring residual stress at the same time, and achieve strong operability , to ensure the consistency of the effect

Active Publication Date: 2012-05-09
GRIMAT ENG INST CO LTD
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Problems solved by technology

These methods can quickly reflect the level of material hardenability through comparative tests, but due to the large difference between the test conditions and the actual production conditions, they cannot directly and accurately reflect the actual hardenability of the material under specific quenching conditions. It is also difficult to measure the corresponding residual stress at the same time, an

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  • Method suitable for directly testing and evaluating quenching effect of aluminum alloy material
  • Method suitable for directly testing and evaluating quenching effect of aluminum alloy material
  • Method suitable for directly testing and evaluating quenching effect of aluminum alloy material

Examples

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Embodiment 1

[0038] This embodiment is to test and evaluate the quenching effect of 210 mm thick Al-7.6Zn-1.8Mg-1.4Cu-0.12Zr (wt%) alloy forgings immersed in water at room temperature. Cut a quenched sample with a size of 210mm high x 150mm wide x 150mm long from a whole forging with a specification of 210mm thick x 600mm wide x 2000mm long, such as figure 1 as shown, figure 1 The dotted line in the figure shows the outline of the cube quenched sample, except that the upper and lower planes in the thickness direction are used as the quenching surface, and the other sides are heat-insulated. After solid solution treatment, it is quenched by water immersion at room temperature; and a thermocouple is embedded in the sample for real-time temperature monitoring. figure 1 A schematic diagram of the immersion and quenching sample and the position of the embedded thermocouple for temperature measurement is given. In order to obtain the cooling rate at different positions in the direction of samp...

Embodiment 2

[0042] Al-7.5Zn-1.7Mg-1.4Cu-0.12Zr (wt%) alloy thick plate, the specification of the whole thick plate is 120mm thick × 1000mm wide × 2500mm long, and the dimensions cut from it are 120mm high × 150mm long × 150mm For the wide quenched sample, except for the upper and lower planes in the thickness direction as the quenching surface, the other sides are heat-insulated. After solid solution treatment, spray quenching with water at room temperature, followed by T76 aging treatment; and a thermocouple is embedded in the sample for real-time temperature monitoring. Using this method, the maximum difference in strength in the thickness direction of the sample is 3.9%, and the maximum difference in conductivity is 2.1%. At the same time, the equivalent surface residual stress of the sample is measured to be 203MPa; the whole thick plate is tested in actual production. Spray quenching treatment, after aging treatment, the maximum difference in strength along the thickness direction of...

Embodiment 3

[0044] Al-7.5Zn-1.7Mg-1.4Cu-0.12Zr (wt%) alloy thick plate, the specification of the whole thick plate is 120mm thick × 800mm wide × 2000mm long, and the dimensions cut from it are 120mm high × 150mm long × 150mm For the wide quenched sample, except for the upper and lower planes in the thickness direction as the quenching surface, the other sides are heat-insulated. After solution treatment, immerse in 25% PAG quenching solution at room temperature, and then perform T76 aging treatment; and pre-embed thermocouples in the sample for real-time temperature monitoring. Using this method, the maximum difference in strength in the thickness direction of the sample is 9.2%, and the maximum difference in conductivity is 4.7%. At the same time, the equivalent surface residual stress of the sample is 61MPa; the whole thick plate is tested in actual production. Quenching treatment, after aging treatment, the maximum difference in the strength of the central part of the plate along the t...

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Abstract

The invention discloses a method suitable for directly testing and evaluating the quenching effect of an aluminum alloy material. The method comprises the following steps of: (1) cutting a quenching sample, filling a thermocouple into a characteristic position, and performing heat insulating treatment on the side face of the sample; (2) performing solution heat treatment on the treated sample and monitoring the temperature; (3) performing quenching tests under different quenching conditions and monitoring the quenching cooling speeds of the sample at different positions; (4) testing residual stress on the characteristic position, determining the tensile properties, hardness and electric conductivities of positions of different depth distances way from the quenching surface, drawing a curve and performing microstructure observation and analysis; and (5) determining an appropriate quenching process for practical material production according to a test result obtained in the step (4). In the invention, a sample heat insulating treatment method is adopted, and the temperature is monitored in real time with a thermocouple filling method, so that the practical quenching state of a material can be simulated directly and accurately, the consistence between the test result and a test result of a large-specification workpiece under overall quenching is high, and a quenching process suitable for practical production can be optimized and determined.

Description

technical field [0001] The invention relates to a method suitable for directly testing and evaluating the quenching effect of aluminum alloys, belonging to the field of heat treatment of metal materials. Background technique [0002] Heat treatment can strengthen aluminum alloys, mainly including 7XXX series aluminum alloys, 2XXX series aluminum alloys and 6XXX series aluminum alloys, etc., which are widely used in aerospace, transportation and other fields. The high strength and hardness of the alloy are mainly obtained through solid solution, quenching and subsequent aging; quenching is a key process, quenching makes the high-temperature state of the alloy fix the supersaturated state to room temperature by rapid cooling, the purpose of which is to make the quenching A large number of vacancies and supersaturated solid solutions remain in the structure, providing thermodynamic and kinetic conditions for aging precipitation. Then there is a problem of hardenability in this...

Claims

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Application Information

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IPC IPC(8): G01N3/60G01N3/00G01N3/40G01N1/44G01N1/42C22F1/04
Inventor 张永安李锡武熊柏青李志辉朱宝宏王锋刘红伟
Owner GRIMAT ENG INST CO LTD
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