End surface quenching test device of hardenability of aluminum alloy, and method thereof

Abstract

The invention provides an end surface quenching test device of the hardenability of an aluminum alloy, and a method thereof. The device comprises: a fixed frame; a sample support; an end surface quenching unit having a water spray support, a water nozzle and a water tank; a hardness measuring unit used for detecting hardness signals at a plurality of hardness measuring positions on a sample rod; atemperature measuring unit used for detecting temperature signals at a plurality of temperature measuring positions on the sample rod; a data acquisition card used for receiving the hardness signalsand the temperature signals; and a data analyzing unit used for analyzing the hardness signals and the temperature signals to obtain the relation curve of the hardness of the sample rod and a distance, the relation curve of the cooling rate and the distance, the relation curve of the hardness and the cooling rate and the distance from the position corresponding to 90% of a maximum hardness value to the quenching end, wherein the distance is the hardening depth. The sample rod is vertically arranged, the fixed end of the sample rod is connected with the sample support, the quenching end is provided with a cylindrical groove, and the central axis of the water nozzle coincides with the central axis of the groove.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and in particular relates to an end face quenching test device and method for the hardenability of aluminum alloys. Background technique [0002] As a structural material widely used in the aviation industry and the automobile industry, aluminum alloy has high strength after aging. In order to obtain the best aging strengthening effect, the material must be rapidly quenched after solid solution. However, as the thickness increases, or due to the need to control the residual stress, the quenching rate of the central part of the material often does not reach the required critical cooling rate, the performance decreases, and the phenomenon of hardenability occurs. Therefore, the hardenability of aluminum alloy thick section materials has aroused widespread concern. [0003] Quenching of aluminum alloy is to fix the supersaturated state to room temperature by rapid cooling in the high tempe...

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Problems solved by technology

[0007] Although there are a small number of literature reports involving the hardenability of aluminum alloys, due to the differences in the analysis and testing methods adopted by different authors, the parameters obtained are not comparable. Alloy hardenability analysis test method

In the past, when this type of test was used to measure the hardenability of aluminum alloys, due to the relatively simple test equipment, the test results were greatly affected by water pressure, water flow height and water temperature fluctuations, and it was difficult to accurately meet the test requirements.

Therefore, there is no unified standard for the diameter of water spray nozzle, water spray height, and sample size of the end quenching-hardness test method used in the study of aluminum alloy hardenability. It is necessary to establish a set of reasonable and recognized aluminum alloy quenching Permeability test device and test method

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