Carburized induction-hardened component

A technology of high-frequency quenching and carburizing, applied in the direction of improving energy efficiency, process efficiency, furnace type, etc., can solve the problems of poor machinability of raw materials and decreased toughness, and achieve small heat treatment deformation, good machinability of raw materials, Effect of High Fatigue Strength and Toughness

Inactive Publication Date: 2008-05-21
AISIN AW CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is still the problem of decreased toughness due to high C content
In addition, th...

Method used

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  • Carburized induction-hardened component
  • Carburized induction-hardened component

Examples

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Embodiment Construction

[0111] The present invention is specifically illustrated by the following examples. In addition, these examples are for illustrating the present invention, and do not limit the scope of the present invention.

[0112] After the hot-pressed raw materials having the chemical composition shown in Table 1 were hot-forged, they were annealed. Then, by machining, an Ono-type rotating bending fatigue specimen is made, the parallel portion of which is φ9mm, and a semicircular arc with a radius of 1.14mm. Similarly, a U-notch impact test sample (JIS Z 2202, Figure 2a) and a ring gear for gear deformation measurement (pitch circle diameter φ157mm, modulus 2.45, number of teeth 51, inner diameter φ86mm) were produced.

[0113] Next, each sample and the ring gear were processed according to the three manufacturing methods (processes 1-3).

[0114] [Process 1]: Under a reduced-pressure atmosphere of 20hPa, carburizing at 950°C for 30min → slow cooling according to the cooling rate in Table...

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Abstract

A component is subjected to carburizing treatment and then induction-hardening treatment, and is formed from steel consisting essentially of, by mass, C: minimum 0.08% and under 0.3%; Si: maximum 2.0%; Mn: from 0.2% to 3.0%; P: maximum 0.03%; S: from 0.005% to 0.05%; Ni: maximum 1.5%; Cr: maximum 3.0%; Mo: maximum 1.0%; O: maximum 0.0025%; and N: from 0.005% to 0.03%; and further including either or both of, by mass, Al: from 0.005% to 0.05%, and Ti: from 0.005% to 0.05%; and still further including either or both of, by mass, V: maximum 0.3%, and Nb: maximum 0.3%; and a residual portion includes Fe and unavoidable impurities. The hardness of a surface layer is at least 55 HRC and the hardness of a core part is from 20 to 50 HRC. A metal structure of the core part does not include a martensite structure.

Description

technical field [0001] The present invention relates to parts such as gears which are suitable for mechanical structural parts, especially power transmission parts such as automobiles, have high fatigue strength and toughness, and have small heat treatment deformation. Background technique [0002] A gear used as a mechanical structural member, such as a power transmission member of an automatic transmission, is required to have bending fatigue strength and toughness. In addition, recently, due to environmental problems, high dimensional accuracy is required in order to suppress noise during gear operation. Conventionally, surface-hardened steels such as JIS SCr420 and SCM420 have generally been used as raw materials for the above-mentioned teeth. However, in response to the growing trend of increasing the strength of automobile parts and reducing noise, in fact, conventional case-hardened steels have limitations in the above-mentioned strength and dimensional accuracy, and...

Claims

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Application Information

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IPC IPC(8): C22C38/60C21D1/06C21D1/10C21D9/32C21D9/40C22C38/00
CPCC22C38/22C21D1/06C21D7/06C21D9/40C21D1/10C22C38/02C22C38/06C22C38/04C21D1/00C22C38/001C21D9/32Y02P10/25C22C38/60
Inventor 谷口孝男白井久雄大林巧治冈田一晃蟹泽秀雄小泽修司
Owner AISIN AW CO LTD
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