Alloy steel powder for powder metallurgy and method of producing iron-based sintered body
An alloy steel powder and powder metallurgy technology, applied in metal processing equipment, coating, transportation and packaging, etc., can solve the problems of reduced compressibility, reduced density of compressible sintered body, large characteristic deviation, etc., to achieve high compressibility. Effect
Inactive Publication Date: 2016-05-04
JFE STEEL CORP
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Problems solved by technology
However, there is a problem that due to the large segregation of each alloy element powder, the variation in properties is large, and the alloy element is not sufficiently diffused in Fe, resulting in a non-uniform structure, and effective matrix strengthening cannot be achieved.
However, in this alloying, the alloy steel powder as the raw material is hardened, the compressibility is lowered, and there is a problem that the burden on the equipment in the press forming is increased.
In addition, the decrease in the compressibility of the alloy steel powder causes a decrease in the density of the sintered body, which will offset the increase in strength.
Method used
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Embodiment
[0082] Hereinafter, the present invention will be described in further detail through examples, but the present invention is not limited in any way by the following examples.
[0083] In this embodiment, as the iron-based powder, an apparent density of 2.65Mg / m 3 Or the apparent density is 2.80Mg / m 3 , the apparent density is 3.25Mg / m 3 The atomized raw powder, and the apparent density of 2.60Mg / m 3 Or the apparent density is 2.75Mg / m 3 The reduced iron powder, in addition, using the apparent density of 2.60Mg / m 3 Or the apparent density is 2.80Mg / m 3 , the apparent density is 3.30Mg / m 3 atomized iron powder.
[0084] Mo oxide powder (average particle size: 10 μm) was added to these iron-based powders at a predetermined ratio, mixed with a V-type mixer for 15 minutes, and then heat-treated in a hydrogen atmosphere with a dew point of 30°C (holding temperature: 880°C , holding time: 1h), the alloy steel powder for powder metallurgy that is diffused and adhered to the sur...
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Abstract
According to the present invention, an alloy steel powder for powder metallurgy is regulated to have a specific surface area of 0.100 m2 / g or larger, contain Mo in an amount in the range of 0.2-1.5 mass%, and contain a graphite powder in an amount in the range of 0.1-1.0 mass% per 100 mass% the alloy steel powder for powder metallurgy. Thus, a sintered body which combines strength and toughness on a high level can be obtained from the alloy steel powder for powder metallurgy.
Description
technical field [0001] The present invention relates to an alloy steel powder for powder metallurgy suitable for use in powder metallurgy technology, and particularly seeks to improve the strength and toughness of a sintered material using the alloy steel powder. [0002] In addition, the present invention relates to a method for producing an iron-based sintered body excellent in strength and toughness, which is produced using the alloy steel powder for powder metallurgy. Background technique [0003] Powder metallurgy technology can greatly reduce cutting costs because it can manufacture parts with complex shapes in a shape very close to the shape of the product (so-called near net shape) and with high dimensional accuracy. Therefore, powder metallurgy products are used in many fields as various mechanical structures or parts thereof. [0004] In addition, recently, in order to realize the miniaturization and weight reduction of parts, it is strongly desired to increase th...
Claims
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IPC IPC(8): B22F1/00C22C33/02C22C38/00B22F1/05B22F1/107
CPCC22C38/00C22C38/02C22C33/0264C22C38/002C22C38/12C22C38/16B22F1/05B22F1/107B22F1/00C22C33/02B22F1/17B22F3/16B22F9/02B22F2301/35B22F2304/10
Inventor 前谷敏夫宇波繁尾野友重尾崎由纪子
Owner JFE STEEL CORP