Wear-resistant alloy cast iron cylinder liner and preparation method thereof
A wear-resistant alloy and cylinder liner technology, which is applied in casting molding equipment, metal processing equipment, cylinders, etc., can solve difficult problems such as electrochemical corrosion and loss of hardness of wet cylinder liners
Active Publication Date: 2022-02-18
FUZHOU UNIV +1
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Problems solved by technology
However, in actual production, this technology also has shortcomings. For example, because the thermal stress and tissue stress of high-frequency quenching are much larger than those of laser or plasma quenching, low-temperature tempering is required after high-frequency quenching to reduce residual stress and brittleness, and improve Toughness, which loses some of the hardness gained during quenching
At the same time, surface high-frequency quenching is difficult to solve the problem of electrochemical corrosion in the service process of wet cylinder liners
Method used
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[0027] A wear-resistant alloy cast iron cylinder liner, comprising a cylinder liner body and a QPQ infiltrated layer in an inner hole, the preparation method comprising the following steps:
[0028] 1) Centrifugal casting: Add 40kg of iron filings, 50kg of scrap steel, 175kg of returned charge to the furnace, and add 0.5kg of ferrochrome, then add a recarburizer of 1% of the charge weight to increase the carburization, and then add 0.5% of the charge weight after melting After the secondary carburization of SiC, the temperature was increased to 1550°C for smelting, and then 0.3% of the weight of the furnace charge was added to the rare earth ferrosilicon inoculant for 30s inoculation treatment, and then it was released from the furnace. After frequency conversion centrifugal casting, mold release, and material inspection, the cylinder was obtained. cover body;
[0029] 2) QPQ (Quenching-Polishing-Quenching) treatment: After cleaning the oxide film and oil stains on the surface...
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Abstract
The invention discloses a wear-resistant alloy cast iron cylinder liner and a preparation method thereof. The cylinder liner body is obtained by smelting and centrifugal casting, and then the cylinder liner body is subjected to QPQ treatment and high-frequency quenching to obtain the wear-resistant alloy cast iron cylinder liner. Ground alloy cast iron cylinder liners. The cylinder liner obtained by the invention has good hardness, small friction coefficient and high corrosion resistance.
Description
technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a wear-resistant alloy cast iron cylinder liner and a preparation method thereof. Background technique [0002] The working environment of the cylinder liner is extremely harsh, and its surface is subject to strong friction and wear in a high temperature environment, especially the wet cylinder liner is also subject to electrochemical corrosion. At present, the development of cylinder liner technology at home and abroad is mainly focused on: 1. Cylinder liner material development: The cylinder liner materials developed at home and abroad include boron alloy cast iron, copper-chromium-molybdenum cast iron, bainite cast iron, high-strength synthetic cast iron, and QT70 ductile iron; 2. Development of surface treatment technology, such as phosphating, nitriding, coating, coating, quenching treatment, etc. The development of new materials is a long-term process, and it i...
Claims
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IPC IPC(8): B22D13/02B22C3/00C21D1/18C21D9/00C22C37/06C22C37/10C23C8/50F02F1/00
CPCB22D13/02B22C3/00C23C8/50C22C37/10C22C37/06C21D9/0068C21D1/18F02F1/00Y02P10/20
Inventor 刘东林少阳程超增
Owner FUZHOU UNIV