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Manufacturing method of forged products

A manufacturing method and hot forging technology are applied in the manufacturing field of forged products, which can solve the problems of reducing manufacturing cost and difficulty in obtaining target strength, and achieve the effects of reducing manufacturing cost, suppressing hydrogen embrittlement, and achieving good strength.

Inactive Publication Date: 2015-12-02
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, when forging is performed in the blue brittle region, heat treatment for recovery from embrittlement is required, making it difficult to reduce manufacturing costs
On the other hand, in the case of adopting a temperature range of 600°C or more, due to the approach of Ar 1 Heating the transformation point, so the ferrite+pearlite structure obtained originally begins to grow, and the pearlite grains become coarse. In addition, based on the deformation after processing, ferrite is precipitated in the pearlite grains, thereby, Difficulty achieving target intensity

Method used

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  • Manufacturing method of forged products
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  • Manufacturing method of forged products

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Embodiment Construction

[0021] In the method of manufacturing a forged product according to an embodiment of the present invention, the temperature of 350 to 600° C. The forging process is performed in the area, and instead of using steel containing N as a chemical composition as shown in the existing manufacturing method, using steel with N less than or equal to the unavoidable solid solution amount is based on a completely different from the existing technology. based on technical ideas.

[0022] In the technical field of conventional forged products, steel materials containing N are easily age-hardened, and although high-strength forged products can be obtained, there is a possibility that hydrogen adheres to the age-hardened N to cause hydrogen embrittlement. If the number of hydrogen embrittlement sites on the forged product increases, it will be easily cracked and damaged.

[0023] In addition, for example, in the case of adding Al as a deoxidizing material, since the Al combines with N to pre...

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Abstract

A forging process is conducted in a temperature range of 350-600 °C on at least a portion that is required to have a fatigue strength in an intermediate forged product having a ferrite and pearlite texture obtained by conducting a hot forging on a steel in which N is not greater than an amount at which N is unavoidably dissolved as a solid, thereby improving strength of the portion that is required to have a fatigue strength. With this, there is provided a forged product having a good strength and a low price.

Description

technical field [0001] The present invention relates to a method of manufacturing a forged product. Background technique [0002] In order to improve the strength (yield performance and fatigue strength) of forged products and to omit heat treatment, element V is added to the material, but there are problems of price fluctuation and addition cost due to depletion of V resources. [0003] Therefore, through the cooling process after hot forging, at less than or equal to Ar 1 In the temperature range from the transformation point to 200° C., forging is performed on parts requiring high strength to ensure good strength (for example, refer to Patent Document 1). [0004] However, when forging is performed in the blue brittle region, heat treatment for recovery from embrittlement is required, making it difficult to reduce manufacturing costs. On the other hand, in the case of adopting a temperature region of 600°C or higher, since the approach to Ar 1 Heating the transformatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/00C22C38/00C22C38/38C22C38/60
CPCC21D7/13B21K1/08C21D1/02C21D9/30C21D2211/005C21D2211/009C22C38/00C22C38/02C22C38/04C22C38/38C22C38/42C22C38/60Y10T29/49286
Inventor 吉田纯金子大辅岩田范之
Owner NISSAN MOTOR CO LTD
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