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Carburized component and manufacturing method thereof

A manufacturing method and component technology, applied in the field of carburized components and their manufacturing, can solve the problems of generation of coarse crystalline carbides, manufacturability (deterioration of workability, reduction of toughness, etc.)

Inactive Publication Date: 2007-10-24
DAIDO STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there is a method of improving softening resistance by dispersing carbides in martensite by high carbonization of the material. In this case, deterioration of manufacturability (machinability) and occurrence of Problems such as coarse crystalline carbides and reduced toughness

Method used

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  • Carburized component and manufacturing method thereof
  • Carburized component and manufacturing method thereof
  • Carburized component and manufacturing method thereof

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Experimental program
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Effect test

Embodiment Construction

[0060] Hereinafter, tests performed to confirm the effects of the present invention will be described.

[0061] First, steels with chemical compositions shown in Table 1 were melted in a 150kg high-cycle vacuum induction furnace. The obtained steel block is rolled or hot forged in a round bar with a diameter of 90 mm. In addition, if necessary, a steel bar with a diameter of 22 mm to 32 mm can also be hot forged as a base material for the test.

[0062]

C

Si

mn

Cr

Mo

V

Nb

retreat

fire

hard

Spend

surface

noodle

C

strong

Spend

the carbon

change

thing

noodle

accumulate

Rate

≤

10μm

noodle

accumulate

Rate ...

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Abstract

The carburized component of the present inventions is characterized by having a base metal containing: C: 0.10% to 0.40%; Si: 0.05% to 0.8%; Mn: 0.35% to 1.2%; Cr: 2.0% to 6.0%; and remnant including Fe and inevitable impurities, having a carburized layer formed on a surface layer portion of said base metal, having a grain boundary oxidized layer depth of 1[mu]m or less on a surface thereof and an average C concentration SC of 1. 5% to 4. 0% at 25[mu]m deep from the surface, and adjusted so as to satisfy: 1.76SC-1.06 C22C 38 / 18 B32B 15 / 01 C23C 8 / 22 C22C 38 / 24 C22C 38 / 26 C21D 7 / 06 4 15 1 2007 / 4 / 20 101058864 2007 / 10 / 24 000000000 Daido Steel Co., Ltd. Japan Hattori Atsushi Kano Takashi lougao chao 32200 The Patent Agency of the South-East University No.2 Sipailou, the City of Nanjing, Jiangsu Province 210018 Japan 2006 / 4 / 20 2006-116308 Japan 2007 / 2 / 16 2007-035632

Description

technical field [0001] The present invention relates to carburized components and methods for their manufacture. Background technique [0002] Gears, which are power transmission parts such as bicycles, have problems such as damage to the dedendum caused by bending stress and damage near the pitch point due to slipping (pitting phenomenon). Among them, in order to meet the characteristics of durability, a method of improving surface fatigue strength by carburizing the surface of parts is widely used, and further improvement is attempted by combining various materials and heat treatment. In addition, in recent years, materials for suppressing the intergranular oxide layer and abnormal carburization layer during carburization, which are considered harmful due to root damage, have been developed, and high strength has been achieved by bead peening. [0003] On the other hand, regarding the pitting phenomenon, it was found that if the gear surface repeatedly slipped, the temper...

Claims

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Application Information

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IPC IPC(8): C22C38/18B32B15/01C23C8/22C22C38/24C22C38/26C21D7/06
Inventor 服部笃狩野隆
Owner DAIDO STEEL CO LTD
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