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Steel piston and its preparation method

A steel piston and piston technology, applied in the field of steel piston and its preparation, can solve the problems of poor high temperature resistance and mechanical properties, and achieve good high temperature resistance and mechanical properties, avoid metallographic structure, and stable mechanical properties

Active Publication Date: 2017-04-26
湖南江滨机器(集团)有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned alloy materials are still slightly inferior in high temperature resistance and mechanical properties as piston materials.

Method used

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  • Steel piston and its preparation method

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Experimental program
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Effect test

preparation example Construction

[0033] The present application also provides a preparation method for the above-mentioned steel piston, comprising the following steps:

[0034] 0.38wt% to 0.45wt% of TiC, 0.17wt% to 0.25wt% of Si, 0.50wt% to 0.80wt% of Mn, 0.9wt% to 1.2wt% of Cr, 0.01wt% to 0.02wt% of Mo , ≤0.02wt% Ni is mixed with the rest of Fe and then ball milled;

[0035] Press the ball-milled material to obtain a piston blank;

[0036] Sintering the piston blank, and then quenching;

[0037] The quenched piston blank is subjected to solution treatment and then aging treatment to obtain a steel piston.

[0038] The steel piston prepared by the method of powder metallurgy in this application has the characteristics of dense metallographic structure and stable mechanical properties.

[0039] According to the present invention, the above-mentioned various components are firstly mixed, and then ball milled to obtain uniformly mixed materials. In the above process, the ball-to-material ratio of the ball m...

Embodiment 1

[0051] 0.40wt% TiC, 0.20wt% Si, 0.70wt% Mn, 1.0wt% Cr, 0.02wt% Mo, 0.01wt% Ni, other individual elements ≤ 0.05%, other elements total ≤ 0.15 % mixed with the rest of Fe, ground in a ball mill, the ball-to-material ratio is 2:1, the alcohol addition is 0.08%, and the ball milling time is 20 minutes;

[0052] After unloading, wash with tap water for 3 times, and then carry out precipitation for 25 minutes; carry out steam drying after the precipitation, and then carry out glue mixing after grasping the clear water in the hand, the ratio is 0.08%, and then carry out vibration drying, the time is 25 minutes;

[0053] Put the mixed and ground material into the mold and press it into a piston blank;

[0054] Put the piston blank in a vacuum sintering furnace, heat it up to 1400°C at a rate of 5°C / min and sinter for 3.5 hours, then cool it down to 860°C at a rate of 5°C / min and keep it for 3 hours, then put it out of the furnace and put it in an oil tank for quenching;

[0055] Co...

Embodiment 2

[0058] 0.38wt% TiC, 0.17wt% Si, 0.50wt% Mn, 0.9wt% Cr, 0.01wt% Mo, 0.02wt% Ni, other individual elements ≤ 0.05%, other elements total ≤ 0.15 % mixed with the rest of Fe, ground in a ball mill, the ball-to-material ratio is 2:1, the alcohol addition is 0.05%, and the ball milling time is 20 minutes;

[0059] After unloading, wash with tap water for 3 times, and then carry out precipitation for 25 minutes; carry out steam drying after the precipitation, hold it in your hand and do not squeeze clear water, then carry out glue mixing, the ratio is 0.05%, and then carry out vibration drying, the time is 25 minutes;

[0060] Put the mixed and ground material into the mold and press it into a piston blank;

[0061] Put the piston blank in a vacuum sintering furnace, heat up to 1300°C at a rate of 3°C / min and sinter for 3.5 hours, then cool down to 830°C at a rate of 8°C / min and keep it for 3 hours, then put it out of the furnace and put it in an oil tank for quenching;

[0062] Co...

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Abstract

The invention provides a steel piston and a preparation method thereof. The steel piston comprises the following chemical components: 0.38-0.45 wt% of TiC, 0.17-0.25 wt% of Si, 0.50-0.80 wt% of Mn, 0.9-1.2 wt% of Cr, 0.01-0.02 wt% of Mo, Ni not more than 0.02 wt%, and the balance of Fe. As the components and the contents of the components in the steel piston are optimized, the steel piston is better in high-temperature resistance and mechanical performance; and a powder metallurgy mode is adopted to prepare the steel piston with compact metallographic structure and stable mechanical performance.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a steel piston and a preparation method thereof. Background technique [0002] As the heart part of the internal combustion engine, the piston affects the overall performance of the internal combustion engine. In recent years, due to the continuous improvement of the degree of strengthening of internal combustion engines and the increasingly stringent emission requirements, especially the strengthening indicators such as high power, high speed, high explosion pressure, and high power rise have become the development trend of internal combustion engines, so in order to adapt to the continuous improvement of the degree of strengthening and the increasingly stringent emission requirements For strict internal combustion engines, pistons need to have good high temperature resistance and mechanical properties. [0003] Traditional aluminum alloy pistons are increasingly diffic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/44C22C38/22C22C33/02
Inventor 易绿林陈卫东杨娟娟唐建萍
Owner 湖南江滨机器(集团)有限责任公司
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