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Preparation method of bainite-martensite automobile gear nodular cast iron

A technology of martensite and bainite, which is applied in the field of preparation of nodular cast iron for automotive gears, can solve the problems of complex preparation process, fatigue cracks, high cost, etc., and achieve simple preparation process, low preparation cost, good toughness and wear resistance Effect

Active Publication Date: 2013-02-06
齐齐哈尔市金铸良铸造有限责任公司
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the technical problems of the existing automotive engine gear material 20CrMnTi, which has complex preparation process, high cost, and fatigue cracks, and provides a method for preparing bainite-martensitic automotive gear nodular cast iron

Method used

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specific Embodiment approach 1

[0017] Specific embodiment one: the preparation method of the bainite-martensitic automotive gear ductile iron of the present embodiment is carried out according to the following steps:

[0018] 1. Smelting molten iron: First weigh 60~65 parts of Q10 pig iron, 25~30 parts of ductile iron return charge and 10~15 parts of scrap steel according to the mass parts, and then mix Q10 pig iron, ductile iron return charge and The ratio of the total mass of scrap steel is (1.5~2.0): 100, based on the ratio of the mass of electrolytic copper to the total mass of Q10 pig iron, nodular iron and scrap steel (0.6~1.0): 100, based on the mass of ferromolybdenum and Q10 pig iron , The ratio of the total mass of ductile iron return charge to scrap steel is (0.3~0.6): 100. Weigh the nickel plate, electrolytic copper and ferromolybdenum, and then weigh the weighed Q10 pig iron, ductile iron return charge, scrap steel, nickel plate, electrolytic Add copper and ferromolybdenum into the intermediate...

specific Embodiment approach 2

[0024] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the total mass of impurities in Q10 pig iron in step 1 is ≤0.1%, and the components and the mass fractions of each component in scrap steel are: C: 0.17%~0.21%, S: 0.012%~0.016%, P: 0.020%~0.024%, Mn: 0.26%~0.30%, Si: 0.30%~0.40%, and other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0025] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the mass fraction of Ni in the nickel plate in step 1 is 99.9% to 99.99%, and other steps and parameters are the same as Embodiment 1 or 2.

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Abstract

The invention provides a preparation method of bainite-martensite automobile gear nodular cast iron and relates to a preparation method of automobile gear nodular cast iron. The method provided by the invention is mainly used for solving the technical problems of the existing automobile engine gear material 20CrMnTi that the preparation process is complex, the cost is high and fatigue cracks can be easily formed; and the preparation method comprises the following steps of: firstly, smelting an iron liquid; secondly, nodulizing and inoculating; thirdly, carrying out isothermal quenching; fourthly, carrying out high frequency surface quenching; and finally, tempering and carrying out heat treatment. The bainite-martensite automobile gear nodular cast iron obtained by adopting the preparation method provided by the invention has the surface hardness of 55-65HRC, the tensile strength of 1100-1120MPa, the impact value of 85-100J and the rotating bending fatigue strength of 560-600MPa, is 20% lower in cost compared with that of 20CrMnTi, is simple in operations of the preparation process and can substitute for low-alloy steel 20CrMnTi so as to be applied to the field of automobile engine gear preparation.

Description

technical field [0001] The invention relates to a preparation method of nodular cast iron for automobile gears. Background technique [0002] Austempered nodular cast iron is a new type of material that has been paid attention to and studied deeply at home and abroad in recent years. It has excellent mechanical properties, such as high toughness, tensile strength, fracture toughness and fatigue strength, as well as better wear resistance and shock absorption and noise reduction performance than steel. In the environment of fierce competition in the market economy, high-performance, low-cost materials are the most sought after goals, and austempering ductile iron is one of such materials. In recent years, in the field of automobiles, austempering ductile iron has been used to replace forged steel or cast steel to produce auto parts, which can reduce the weight by 10-30%, reduce the cost by 15-30%, and can reduce the noise of the car from the source and reduce the exhaust gas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/04C22C33/10C21C1/10C21D5/00
CPCY02P10/20
Inventor 鲍玉龙王彬
Owner 齐齐哈尔市金铸良铸造有限责任公司
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