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Soft-nitrided induction-quenched steel component

一种高频淬火、软氮化的技术，应用在提高能源效率、工艺效率的提高、涂层等方向，能够解决压缩残余应力小、不优选、淬火应变大等问题，达到面疲劳强度优异的效果

Inactive Publication Date: 2015-10-14
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the compressive residual stress near the surface is small, and the quenching strain becomes large, which is not preferable as part characteristics.

Method used

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  • Soft-nitrided induction-quenched steel component
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  • Soft-nitrided induction-quenched steel component

Examples

Experimental program
Comparison scheme
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Embodiment

[0106] Next, examples of the present invention will be described. The conditions of the examples are examples used to confirm the practicability and effects of the present invention, and the present invention is not limited to this example. In the present invention, various conditions can be adopted as long as the object of the present invention is achieved without departing from the gist of the present invention.

[0107] Each steel material having the chemical composition shown in Table 1 was heated to 1250° C., hot forged, left to cool to room temperature, heated again, and normalized at 850° C. for one hour. Thereafter, for use in the roller pitting fatigue test piece, a small roller test piece having a cylindrical portion with a diameter of 26 mm and a width of 28 mm and a large roller test piece with a diameter of 130 mm and a width of 18 mm were produced by machining. Furthermore, hardness and residual stress measurement test pieces having a diameter of 26 mm and a len...

Embodiment 30

[0110] In Example 30, no nitrocarburizing treatment was performed, and only induction hardening was performed. In addition, in Example 31, only nitrocarburizing treatment was performed under the above-mentioned conditions (soft nitrocarburizing time: 2 hours), and induction hardening was not performed.

[0111]Using the fabricated large and small rollers, a roller pitting fatigue test was performed as a standard surface fatigue test. The roller pitting fatigue test is carried out as follows: set the surface pressure to the Herbschel stress of 3500 MPa to press the large roller against the small roller, so that the direction of the peripheral speed of the two rollers on the contact part is set to the same direction, and the The slip ratio was set to -40% (the peripheral speed of the contact portion of the large roller was 40% greater than that of the small roller) and it was rotated. The oil temperature of the gear oil supplied to the contact portion was set at 80°C. The serv...

Embodiment 26

[0116] Examples 26 and 27 are examples in which the concentration of solid solution N in the surface layer after induction hardening deviates from the present invention. The steel material of Example 26 is the same as that of Example 1, but the nitrocarburizing treatment time is shorter. Therefore, the concentration of solid solution N in the surface layer did not reach 0.05%, the 300°C tempering hardness of the surface layer showed a low value less than Hv600, and the life was short. The steel material of Example 27 is the same as that of Example 4, but the nitrocarburizing treatment time is long. Therefore, the concentration of solid solution N in the surface layer exceeds 1.5%, and a large amount of retained austenite exists, so the tempering hardness of the surface layer at 300°C is low, and the compressive residual stress near the surface is reduced due to the small volume change during quenching, so the life is short .

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Abstract

　A soft-nitrided induction-quenched steel component having excellent surface fatigue strength, characterized in having a predetermined chemical composition, a solid solution N concentration of 0.05 to 1.5% to a depth of 0.2 mm from the surface, a Vickers hardness of Hv 600 or higher to a depth of 0.2 mm from the surface following tempering at 300°C, an effective hardening layer depth (t) of 0.5 mm or more, and a ratio t / r ≰ 0.35, where r (mm) is the radius or half the thickness of a location liable to be damaged.

Description

technical field [0001] The present invention relates to nitrocarburized induction hardened steel parts, and in particular to soft nitriding high-frequency hardened steel parts used in gears with high surface fatigue strength suitable for power transmission parts such as automobiles, continuously variable transmissions, constant velocity joints, hubs, etc. Nitriding induction hardened steel components. Background technique [0002] For steel parts such as gears of automatic transmissions, pulleys of continuously variable transmissions, constant velocity joints, power transmission parts such as hubs, high surface fatigue strength is required. Generally, for the above-mentioned parts, case-carburized steel with C of about 0.2% such as JIS SCr420 and SCM420 is used as the raw material, and the case-carburized steel is subjected to carburizing and quenching treatment to form a C of about 0.8% on the surface of the part. The hardened layer of the martensitic structure can be used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D1/06C21D1/10C21D9/32C22C38/38C22C38/60C23C8/32C23C8/80
CPCC21D1/06C21D1/10C21D9/32C22C38/00C22C38/38C22C38/60C23C8/32C23C8/80C21D1/74C21D1/42C21D1/18C21D6/004C21D6/005C21D6/007C21D6/008C21D9/0068C22C38/001C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/30C22C38/32C22C38/40C22C38/46C22C38/50C23C8/26Y02P10/25
Inventor 小山达也吉田卓
Owner NIPPON STEEL CORP
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