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Layered fe-based alloy and process for production thereof

A technology of iron-based alloys and manufacturing methods, applied in the directions of manufacturing tools, coatings, solid-state diffusion coatings, etc., can solve problems such as difficulty in improving various properties of metal materials, and achieve less brittle failure, less stress concentration, excellent hardness and the effect of strength

Inactive Publication Date: 2008-07-30
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it is difficult to improve various characteristics deep inside the metal material

Method used

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  • Layered fe-based alloy and process for production thereof
  • Layered fe-based alloy and process for production thereof
  • Layered fe-based alloy and process for production thereof

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Embodiment Construction

[0070] The layered iron-based alloy of the present invention will be described in detail below with reference to the accompanying drawings, which illustrate preferred embodiments of the present invention in relation to the method of manufacture thereof.

[0071] FIG. 1 is a schematic perspective view showing a complete punch for hot forging work formed from the layered iron-based alloy according to the first embodiment. The punch 10 for hot forging was manufactured using SKH51 as a raw material (base metal). The punch 10 for hot forging has a large-diameter portion 12 , a reduced-diameter portion 14 connected to the large-diameter portion 12 and whose diameter decreases in a tapered shape, a small-diameter portion 16 , and a curved protrusion 18 protruding from one end of the small-diameter portion 16 . The curved protrusion 18 and the side wall of the front end of the small diameter portion 16 are used to press the workpiece (which is accommodated in a cavity of a mold, not s...

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Abstract

The surface of a pre-molded article made of SKH51 (Fe-based alLoy) is coated with a powder of Al, Cr and the like. The coating may be performed by applying a coating agent which is prepared by dispersing the powder in an organic solvent. The coating agent may contain a reducing agent. After coating, the pre-molded article is subjected to heat treatment to form a carbonized product of the metal. The pre-molded article may be further treated with nitrogen, thereby forming a layered Fe-based alloy which has a diffusion layer (20) which is formed by the diffusion of the carbonized product, a nitrided product and AIN in the base material. Subsequently, the article may be subjected to finishing process to give a punch (10) having a predetermined shape for use in a hot-roll forging process.

Description

technical field [0001] The present invention relates to a layered iron-based alloy provided with a diffusion layer on the surface of a base material composed of an iron-based alloy, the diffusion layer containing carbides and nitrides and having an The high hardness of the base metal is described. Background technique [0002] In order to improve various characteristics of the material such as wear resistance, corrosion resistance and strength, for example, on iron-based alloys by physical vapor deposition (PVD), chemical vapor deposition (CVD), electroplating or anodic oxidation, etc. A coating is provided on the surface of the steel material. However, in the above method, it takes a long time to form the coating, and the cost of forming the coating is high. [0003] In view of the above, for example, in Japanese Patent Laid-Open No. 2003-129216 and Japanese Patent Laid-Open No. 2003-239039 , processes such as carburizing, sulfurizing, nitriding, and carbon Various surfa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C12/00C21D1/06C21D9/00C23C8/26C23C8/38C23C8/50C23C8/66C23C10/30C23C10/32
CPCC21D9/00C23C8/32C21D1/06C21D6/00C23C8/26
Inventor 熊木利正松下和男桑原光雄小杉雅纪
Owner HONDA MOTOR CO LTD