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Iron-Based Sintered Alloy, Iron-Based Sintered-Alloy Member and Production Process for Them

a technology production processes, applied in the direction of coatings, etc., can solve the problems of increasing the production cost of iron-based sintered alloys naturally, high unit costs, and high employment amounts etc., and achieves low oxide-formation free energy. , the effect of reducing the recyclability of iron-based sintered alloys

Inactive Publication Date: 2008-01-31
TOYOTA CENT RES & DEV LAB INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0019] Other than Cu, Ni is available as an element, which has been used heavily in iron-based sintered alloys. Ni too, similarly to Cu, is an element, which is effective for improving the strength, and the like, of iron-based sintered alloys. However, Ni powders are expensive as well, and raise the production costs of iron-based sintered alloys. Moreover, Ni is an allergic element, and accordingly there are cases where its employment is not preferable.
[0103] The iron-based sintered-alloy member of the present invention, without ever having Cu contained, is of high strength, and is good in terms of the dimensional stability. Namely, in accordance with the present invention, it is possible to make it a Cu-free iron-based sintered-alloy member, which does not include Cu, which is removed with difficulty by means of smelting, and the like, substantially. Therefore, the present invention improves the recyclability of iron-based sintered-alloy members, and is preferable in view of environmental protections. Further, by suppressing the employment of Cu, the material-cost reduction of iron-based sintered-alloy members can be intended, and additionally the hot brittleness of iron-based sintered-alloy members, which results from Cu, can be avoided. However, the iron-based sintered-alloy member, which is set forth in the present description, according to the present invention does not exclude the case of containing Cu entirely. The case of containing an appropriate amount of Cu in addition to the above-described Si and C is involved in the scope of the present invention as well.

Problems solved by technology

However, Cu powders are such that the unit costs are high and the employment amounts in iron-based sintered alloys, too, are great comparatively.
Accordingly, they result in raising the production costs of iron-based sintered alloys naturally.
Further, Cu is an element, which becomes the cause of hot brittleness of iron / steel materials, but is an element, which is difficult to remove by smelting, and the like.
Consequently, iron-based sintered alloys employing Cu are such that the mingling into scraps, and so forth, is disliked, their recycling is difficult, and the employment of iron-based sintered alloys, which include Cu, are not necessarily preferable for environmental protection.
However, Ni powders are expensive as well, and raise the production costs of iron-based sintered alloys.

Method used

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  • Iron-Based Sintered Alloy, Iron-Based Sintered-Alloy Member and Production Process for Them
  • Iron-Based Sintered Alloy, Iron-Based Sintered-Alloy Member and Production Process for Them
  • Iron-Based Sintered Alloy, Iron-Based Sintered-Alloy Member and Production Process for Them

Examples

Experimental program
Comparison scheme
Effect test

sixth example-eighth example

B: Sixth Example-Eighth Example

[0275] (Production of Samples)

[0276] (1) Iron alloy powders (AstaloyCrM, produced by HEGANESE Co., Ltd., Particle Diameters: 20-180 μm, and AstaloyMo, produced by HEGANESE Co., Ltd., Particle Diameters: 20-180 μm), Fe-system powders, the above-described pure iron powder (ASC100.29 produced by HEGANESE Co., Ltd.), the above-described FMS powders, strengthening powders, and the above-described Gr powder, a C-system powder, were prepared. The composition of AstaloyCrM, an iron alloy powder, is Fe-3Cr-0.5Mo (% by mass), and the composition of AstaloyMo is Fe-1.5Mo (% by mass). The FMS powders employed the above-described #VI, #VII and #VIII powders in Table 6. The production method, classification, particle diameters, and the like, of the FMS powders are the same as described above.

[0277] These various powders were blended so as to make a desired composition, and a raw material powder, which was composed of a uniform mixture powder for each of samples, w...

first example

(1) First Example

Sample Nos. HS9-HS12

[0331] Raw material powders with various compositions were prepared by blending and admixing the above-described Astaloy Mo powder, the graphite (Gr) powder and the#I FMS powder. These raw material powders were compacted with various compacting pressures by means of the die wall lubrication warm compaction method, and the obtained respective powder compacts were sintered, thereby obtaining sintered bodies of Sample Nos. HS9-HS12 set forth in Table 12. The characteristics of the respective powder compacts and respective sintered bodies are set forth in Table 12 along with the blended composition of each of the raw material powders.

[0332] As can be understood from Sample No. HS9, when the blended amount of the FMS powder was such an extremely trace amount as 0.01%, blistering occurred in the samples whose compacting pressure was 1,568 MPa or more, regardless of the blended amounts of the Gr powder. As can be understood from Sample No. HS10, when ...

second example

(2) Second Example

Sample Nos. HS13-HS16

[0335] Raw material powders with various compositions were prepared by blending and admixing the above-described Astaloy Mo powder, the graphite (Gr) powder and the #II FMS powder. These raw material powders were compacted with various compacting pressures by means of the die wall lubrication warm compaction method, and the obtained respective powder compacts were sintered, thereby obtaining sintered bodies of Sample Nos. HS13-HS16 set forth in Table 13. The characteristics of the respective powder compacts and respective sintered bodies are set forth in Table 13 along with the blended composition of each of the raw material powders.

[0336] As can be understood from Sample No. HS13, when the blended amount of the FMS powder was such an extremely trace amount as 0.01%, blistering occurred in the samples whose compacting pressure was 1,568 MPa or more, regardless of the blended amounts of the Gr powder.

[0337] As can be understood from Sample No....

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Abstract

An iron-based sintered alloy of the present invention is an iron-based sintered alloy, which is completed by sintering a powder compact made by press forming a raw material powder composed of Fe mainly, and is such that: when the entirety is taken as 100% by mass, carbon is 0.1-1.0% by mass; Mn is 0.01-1.5% by mass; the sum of the Mn and Si is 0.02-3.5% by mass; and the major balance is Fe. It was found out that, by means of an adequate amount of Mn and Si, iron-based sintered alloys are strengthened and additionally a good dimensional stability is demonstrated. As a result, it is possible to suppress or obsolete the employment of Cu or Ni, which has been believed to be essential virtually, the recyclability of iron-based sintered alloys can be enhanced, and further their cost reduction can be intended.

Description

TECHNICAL FIELD [0001] The present invention relates to an iron-based sintered alloy and an iron-based sintered-alloy member, which are made by sintering a raw material powder including manganese (Mn) and (Si), and a production process for them. Specifically, the present invention relates to an iron-based sintered alloy, which is good in terms of the strength or dimensional stability and which makes Cu free or Ni free possible at reduced costs, and a production process for it (hereinafter, these inventions are referred to as a “first invention”) Moreover, the present invention relates to a high-density iron-based sintered-alloy member, which is of high strength and which is good in terms of the dimensional stability, and a production process for it (hereinafter, these inventions are referred to as a “second invention”). BACKGROUND ART [0002] (Background of the First Invention) [0003] In order to reduce the production costs of structural members, such as mechanical component parts, i...

Claims

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Application Information

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IPC IPC(8): C22C38/04B22F1/00B22F3/16C22C33/02C22C38/22C22C38/12C22C38/00C22C38/02B22F3/02B22F3/035B22F3/10C22C22/00C22C38/44
CPCB22F2003/145B22F2998/10B22F2999/00C22C33/0264C22C38/02C22C38/04C22C38/22B22F1/0003B22F3/02B22F3/10B22F2201/02B22F1/09B22F1/12
Inventor KONDOH, MIKIOMATSUMOTO, NOBUHIKOMIYAKE, TOSHITAKETAKEMOTO, SHIGEHIDETANINO, HITOSHI
Owner TOYOTA CENT RES & DEV LAB INC