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Fe base alloy having layer and method for production thereof

A technology of iron-based alloys and manufacturing methods, applied in coatings, solid-state diffusion coatings, metal material coating processes, etc., can solve problems such as increasing hardness, and achieve easy-to-obtain effects

Inactive Publication Date: 2012-03-07
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of the aforementioned known surface treatment methods, although it is possible to increase the hardness throughout the entire part, it is not possible to increase the hardness of only any part of the part and improve the toughness of another part of the part.

Method used

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  • Fe base alloy having layer and method for production thereof
  • Fe base alloy having layer and method for production thereof
  • Fe base alloy having layer and method for production thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0128] Use DH31 hot forging die steel to manufacture a cylinder with a bottom diameter of 80mm and a height of 80mm.

[0129] On the other hand, the powder (particle size: 10 μm to 70 μm) of substances belonging to Groups III to VIII of the Periodic Table, according to Figure 7 The proportions indicated in , were added to a solution in acetone containing 10% epoxy resin to prepare two coatings A and B. A substance capable of improving the hardness of various steel materials generally represented by DH31 is mainly contained in the coating agent A. Substances that exist in various steel materials and do not contribute to increasing the hardness are mainly contained in the coating agent B.

[0130] After that, the coating agents A and B were respectively applied to different locations on the surface of the same cylinder. The coating was performed by a brush coating method in which the coating agents A and B each had a thickness of 1 mm.

[0131] The coating agents A and B wer...

Embodiment 2

[0136] Use SKH51 high-speed tool steel and SKD11 mold steel to manufacture a cylinder with a bottom diameter of 80mm and a height of 80mm.

[0137] On the other hand, powder (particle size: 10 μm to 70 μm) of substances belonging to Group III to Group VIII of the periodic table is prepared according to Figure 9 The proportions indicated in , were added to a solution in acetone containing 10% epoxy resin to prepare two coatings A and B.

[0138] After that, the coating agent A was applied to the entire surface of the above-mentioned cylinder composed of SKH51, and the coating agent B was applied to the entire surface of the above-mentioned cylinder composed of SKD11. The coating was performed by a brush coating method in which the coating agents A and B each had a thickness of 1 mm.

[0139] The coating agent is naturally dried, and then kept at a temperature of 1,000° C. to 1,180° C. for 2 hours to perform quenching treatment. Subsequently, the temperature is maintained at ...

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Abstract

On respective surfaces of the work pressing site and the body part of the portion (16) having a less diameter of a preliminary formed article (32) comprising SKH51 (a Fe base alloy), a powder of a material containing an element enhancing the hardness of SKH51 and a powder of a material containing an element being contained in SKH51 and not enhancing the hardness of SKH51 are applied respectively.By the heat treatment of the preliminary formed article (32) after the above application, W and the like having been contained in an application agent (34a) is diffused into the surface side in the work pressing site, whereas, in the body part of the portion (16) having a less diameter, W and the like having been contained in SKH51 is diffused into the surface side. As a result, a diffusion layer(20), wherein hardness increases as the distance from the surface decreases, is formed inside the work pressing site, and simultaneously, a concentration change portion (22), wherein toughness improves as the distance from the surface decreases, is formed in the body part of the portion (16) having a less diameter.

Description

technical field [0001] The present invention relates to a layered iron-based alloy having a portion provided with a diffusion layer in which the hardness increases from the inside to the surface, and a method for producing the layered iron-based alloy, and the toughness increases from the inside to the surface. At least one of the other sites where the layer portion is improved is provided with the concentration changing portion. Background technique [0002] By means such as physical vapor deposition (PVD), chemical vapor deposition (CVD), electroplating, or anodic oxidation, etc., coatings can be provided on the surface of steel made of iron-based alloys, thereby improving the wear resistance of materials such as properties such as durability, corrosion resistance and strength. 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, as described in Patent Document 1 a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C10/30C21D1/06C23C10/32C23C12/00
Inventor 熊木利正佐藤尚巳桑原光雄
Owner HONDA MOTOR CO LTD