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Mixed powder for powder metallurgy, sintered body and method for producing sintered body

A technology of powder metallurgy and mixed powder, which is applied in metal processing equipment, transportation and packaging, etc., can solve the problems such as not easy to oxidize, and achieve the effect of excellent compressibility

Active Publication Date: 2021-10-29
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because: as an alloy element having the effect of improving hardenability, Mn, Cr, Si, etc. are known in addition to Mo, but among these elements, Mo is relatively difficult to oxidize, so the manufacture of alloy steel powder is very difficult. Easy

Method used

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  • Mixed powder for powder metallurgy, sintered body and method for producing sintered body
  • Mixed powder for powder metallurgy, sintered body and method for producing sintered body
  • Mixed powder for powder metallurgy, sintered body and method for producing sintered body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] Mixed powders for powder metallurgy were produced using iron-based powders and alloy steel powders containing only Si and Mn as unavoidable impurities, and their properties were evaluated. The specific steps are as follows.

[0089] (a) Iron-based powders were produced by performing a final reduction treatment at 900°C for 60 minutes in a hydrogen atmosphere to decarburize and deoxidize iron powders produced by the water atomization method, and crushing the resulting lumps , from which it is produced. Table 1 shows the component composition of the obtained iron-based powder. In addition, each element shown in Table 1 is an element contained as an unavoidable impurity in iron-based powder.

[0090] As (b) alloy steel powder, two types of pre-alloyed steel powder and composite alloy steel powder were used. The pre-alloyed steel powder is produced by the same method as the iron-based powder described above except that a raw material containing Mo is used as the melt for...

Embodiment 2

[0103] Mixed powders for powder metallurgy were produced in the same manner as in Example 1 except for using Mn-containing iron-based powders and alloy steel powders, and their performances were evaluated. Table 3 shows the composition of the iron-based powder and alloy steel powder used, and Table 4 shows the compounding ratio of each component and the evaluation results.

[0104] From the results shown in Table 4, it can be seen that, similar to the case of Example 1, as the mixing ratio of the iron-based powder increases, the molding density increases, and the tensile strength first increases and then decreases. In addition, in the examples satisfying the conditions of the present invention, 7.00 Mg / m was obtained 3 Above molding density and above 500MPa tensile strength.

[0105]

[0106]

Embodiment 3

[0108] Mixed powders for powder metallurgy were produced by the same method as in Example 1 except for using iron-based powders and alloy steel powders containing Si and Mn, and their performances were evaluated. Table 5 shows the composition of the iron-based powder and alloy steel powder used, and Table 6 shows the compounding ratio of each component and the evaluation results.

[0109] From the results shown in Table 6, it can be seen that, as in Examples 1 and 2, as the mixing ratio of the iron-based powder increases, the molding density increases, and the tensile strength first increases and then decreases. In addition, in the examples satisfying the conditions of the present invention, 7.00 Mg / m was obtained 3 Above molding density and above 500MPa tensile strength. In addition, it can be seen that, in Examples 2 and 3 using raw material powders containing one or both of Si and Mn, the sintered body compared with Example 1 while maintaining a high density of the molded ...

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Abstract

Provides a mixed powder for powder metallurgy that has higher compressibility than partial diffusion alloyed steel powder and can obtain a high molding density. A mixed powder for powder metallurgy, which contains: (a) an iron-based powder containing Si: 0-0.2% by mass and Mn: 0-0.4% by mass, with the balance being Fe and unavoidable impurities; and (b) containing An alloy steel powder of Mo: 0.3 to 4.5% by mass, Si: 0 to 0.2% by mass, and Mn: 0 to 0.4% by mass, with the balance being Fe and unavoidable impurities, (b) the alloy steel powder relative to the above (a) The ratio of the total of the iron-based powder and (b) alloy steel powder is 50 to 90% by mass, and the ratio of Mo to the total of the above-mentioned (a) iron-based powder and (b) alloy steel powder is 0.20% by mass or more and less than 2.20% by mass. quality%.

Description

technical field [0001] The present invention relates to a mixed powder for powder metallurgy, in particular to a mixed powder for powder metallurgy with excellent compressibility. Moreover, this invention relates to the manufacturing method of the sintered body (sintered body) which used the said mixed powder for powder metallurgy, and a sintered body. Background technique [0002] Powder metallurgy technology is a method that can be formed in a shape that is extremely close to the shape of the product (so-called near-net shape), and can also manufacture parts with complex shapes with high dimensional accuracy. According to powder metallurgy technology, cutting costs can be greatly reduced. Therefore, powder metallurgy products are used in many fields as various machines and components. [0003] In addition, in recent years, in order to reduce the size and weight of parts, it is strongly desired to increase the strength of powder metallurgy products, especially for iron-bas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00C22C33/02C22C38/00B22F1/10B22F1/12
CPCC22C38/02C22C38/04C22C38/12C22C33/0207C22C33/0264B22F2998/10B22F1/10B22F1/09B22F1/12B22F3/02B22F3/10B22F3/12C22C33/02B22F2301/35C22C38/16B22F2301/10B22F2302/40
Inventor 小林聪雄中村尚道
Owner JFE STEEL CORP
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