Subzero treatment process of hypereutectic aluminium-silicon alloy piston material
An aluminum-silicon alloy and cryogenic treatment technology is applied in the field of cryogenic treatment of hypereutectic aluminum-silicon alloy piston materials, which can solve the problem that the hypereutectic aluminum-silicon alloy piston material cannot meet the requirements of stable working of the piston, and achieves an economical treatment process. Convenience, refinement of eutectic silicon structure, and the effect of improving strength and hardness
Active Publication Date: 2020-01-17
GUIZHOU UNIV OF ENG SCI
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is to provide a hypereutectic aluminum-silicon alloy piston material that can effectively improve the strength and hardness of the material in order to solve the problem that the existing hypereutectic aluminum-silicon alloy piston material cannot meet the requirements for stable operation of the piston. cold treatment process
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Embodiment 1
[0028] Embodiment 1: A cryogenic treatment process of a hypereutectic aluminum-silicon alloy piston material, characterized in that the process comprises the following steps:
[0029] Step 1: Place the hypereutectic aluminum-silicon alloy piston material in a programmable temperature control device at a temperature of -120°C to slowly cool for 30 minutes;
[0030] Step 2: Put the hypereutectic aluminum-silicon alloy piston material into liquid nitrogen for liquid cryogenic treatment, the temperature of liquid nitrogen is -160°C, and the cooling time is 30 minutes;
[0031] Step 3: Take the hypereutectic aluminum-silicon alloy piston material directly out of the liquid nitrogen, place it in a programmable temperature control device with an initial temperature of -120°C, and slowly raise the temperature to 25°C at a heating rate of 3°C / min; Then stand still at 25°C for 30 minutes;
[0032] Step 4: Repeat steps 1 to 3 once;
[0033] Step 5: Repeat step 1 once;
[0034] Step 6:...
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Abstract
The invention relates to a subzero treatment process of a hypereutectic aluminium-silicon alloy piston material, and belongs to the technical field of hypereutectic aluminium-silicon alloy piston material heat treatment. The manner of combining of long-time subzero treatment and short-time subzero treatment is used, and the hypereutectic aluminium-silicon alloy piston material is subjected to treatment. The process has the beneficial effects of effectively improving the strength and the hardness of the hypereutectic aluminium-silicon alloy, and refining a hypereutectic structure. The treatmentprocess is economic, convenient and high in treatment efficiency.
Description
technical field [0001] The invention relates to the technical field of heat treatment of a hypereutectic aluminum-silicon alloy piston material, in particular to a cryogenic treatment process for a hypereutectic aluminum-silicon alloy piston material. Background technique [0002] Hypoeutectic and eutectic silicon-aluminum alloys are widely used in the production of automobile and motorcycle pistons. However, the fatal problems in the practical application of hypoeutectic and eutectic silicon-aluminum alloys are poor dimensional stability of the piston, poor load resistance against seizure, and irreversible expansion of the volume at high temperature, which leads to the occurrence of the "clamping" phenomenon, making the engine unable to normal work. On the basis of the eutectic aluminum-silicon alloy, increase the Si content to obtain a high-silicon hypereutectic aluminum-silicon alloy. The high-temperature mechanical properties, wear resistance, dimensional stability and ...
Claims
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IPC IPC(8): C22F1/043
CPCC22F1/043
Inventor 晋芳伟
Owner GUIZHOU UNIV OF ENG SCI