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Grain refining method of aluminium bronze

A technology of grain refinement and aluminum bronze, which is applied in the field of metal materials, can solve the problems of grain growth, non-metallic inclusions, segregation, etc., and achieve uniform and fine grain structure, enhanced strength and wear resistance, and easy process control Effect

Inactive Publication Date: 2010-06-23
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are the following methods for refining grains: (1) Adding alloy elements: this method is easy to be popularized and applied in industry, but it will increase the cost of materials, and there are strict requirements on the heat treatment system, especially the temperature. During the subsequent heat treatment, the grains will grow
In addition, due to the addition of alloying elements will introduce impurity elements, due to various reasons during the solidification process, resulting in uneven segregation of chemical components and structures, and even the formation of non-metallic inclusions
(2) Rapid solidification method: The advantage of this method is that the finished product can be obtained directly after the alloy is melted without going through an intermediate process, and the refinement effect is good, but it reduces the order degree of the copper alloy, and the phase transition temperature is unstable during aging. There are also limitations in size and shape, and only thin ribbon and filament products can be obtained
(3) Powder metallurgy method: the copper-based memory alloy prepared by this method has anti-cycle attenuation and good ductility, but its process parameters are difficult to control
(5) Electric pulse inoculation treatment: it has an effective thinning effect, and the equipment and process of this technology are simple and easy to operate, but the thinning effect for products with larger cross-sections is not obvious enough, and it only stays in the experimental stage

Method used

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  • Grain refining method of aluminium bronze
  • Grain refining method of aluminium bronze
  • Grain refining method of aluminium bronze

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] According to the grain refinement method described in the present invention, a kind of aluminum bronze alloy has been carried out grain refinement treatment, and its chemical composition (mass fraction wt%) is, Cu 88.26%, Al 11.54%, Bi 0.14%, the rest 0.06% impurity. Using oxygen-free copper (purity 99.99%), aluminum powder (purity 99.7%) and bismuth powder (purity 99.9%) as raw materials, it is melted in a 2Kg vacuum induction furnace. At ~1180°C, it is cast into a medium ф50×100mm ingot in a graphite mold.

[0018] The obtained aluminum bronze alloy samples were subjected to high-pressure experiments on a CS-IIB six-sided top press. The pressure is 6GPa, the heating temperature is 700°C, the holding time is 5min, the power is turned off and the pressure is kept to cool to room temperature (about 25°C), and then the sample after high pressure treatment is heat-treated in the STA449C thermal analyzer, and the heating temperature is 650°C , the holding time is 1min, an...

Embodiment 2

[0020] The composition, preparation and process of the experimental materials are the same as in Example 1, only the parameters of the high-pressure treatment are different. In this embodiment, the pressure is 1 GPa, the heating temperature is 900° C., the holding time is 20 minutes, and the power is turned off and the pressure is maintained to cool to room temperature (about 25° C.). This embodiment uses lower pressure and higher temperature and holding time. Observation by a metallographic microscope shows that the refinement effect of the aluminum bronze alloy structure is relatively obvious, and the grain size of the α phase is about 15-20 μm, which is basically the same as the refinement effect of Example 1.

Embodiment 3

[0022] The composition, preparation and process of the experimental materials are the same as in Example 1, only the heat treatment parameters are different. In this embodiment, the heating temperature is 750° C., the holding time is 0.5 min, and the cooling rate is 20° C. / min to cool to room temperature. This embodiment uses higher temperature, shorter holding time and faster cooling rate. Observation by metallographic microscope shows that the refinement effect of the aluminum bronze alloy structure is also relatively significant, and the grain size of the α phase is about 12-18 μm, and its grain size is 1 / 6-1 / 3 of the grain size of the aluminum bronze alloy before treatment. 12. Only the acicular α in the processed aluminum bronze alloy structure is more than that in Example 1, and the granular α is less than that in Example 1.

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Abstract

The invention discloses a method for thinning aluminium bronze crystal grains. The invention is characterized in that: the method comprises two parts of high pressure treatment and heat treatment, wherein, in the high pressure treatment, aluminium bronze is treated in a solid-state phase change region; the high pressure treatment comprises the following process parameters that: the pressure is between 1 and 6 GPa; the treatment temperature is between 700 and 900 DEG C and the heat preservation time is between 5 and 20 minutes; and the aluminium bronze is naturally cooled to the room temperature through power cutoff and pressure maintenance; in the heat treatment: the treatment temperature is between 600 and 750 DEG C; the heat preservation time is between 0.5 and 2 minutes; and the cooling speed is between 5 and 30 DEG C / min; and the aluminium bronze is cooled to the room temperature. The Al content in the aluminium bronze is between 10 and 15 weight percent. In the method, the aluminium bronze can acquire thinner and evener crystal grains by a combination of high pressure treatment and heat treatment, thereby achieving the perfect effect of crystal grain thinning.

Description

technical field [0001] The invention belongs to the field of metal materials, and relates to a process method for refining aluminum bronze alloy structure. Background technique [0002] Aluminum bronze alloys have excellent mechanical properties, wear resistance, corrosion resistance and oxidation resistance, and have been widely used in machinery, instrumentation, automobiles, ships and marine fields. With the rapid development of modern industry, various fields have put forward higher requirements for aluminum bronze materials. Refining the grains can improve the performance of the alloy in many aspects at the same time. At present, there are the following methods for refining grains: (1) Adding alloy elements: this method is easy to be popularized and applied in industry, but it will increase the cost of materials, and there are strict requirements on the heat treatment system, especially the temperature. During the subsequent heat treatment, the grains grow. In additi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/08
Inventor 张瑞军刘建华
Owner YANSHAN UNIV