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Method for the manufacture of a metal part
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A technology of metal parts and parts, applied in the direction of metal processing equipment, transportation and packaging, etc.
Active Publication Date: 2013-10-16
METAL ADDITIVE TECH
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Problems solved by technology
However, when it is desired to produce net-shape or near-net-shape products with no or only minor subsequent deformation processing, there is no possibility of destroying the defective structure
Method used
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Embodiment 1
[0089] Embodiment 1 (comparison)
[0090] A tool steel containing the following analysis components was made into atomized powder: C 0.49wt%, Si 1.2wt%, Mn 0.34wt%, Cr 7.3wt%, Mo 1.4wt%, V 0.57wt%.
[0091] Powders were produced and agglomerated according to the method described above.
[0092] Before agglomeration, the tool steel powder is soft annealed in the green stage after compaction in order to obtain the highest possible density. Typical hardness after softening annealing is 250 HB max.
[0093] Use 600N / mm 2 The powder was pressed into a cylinder with a diameter of 150 mm and a height of 22 mm. The density was determined by dividing weight by volume to be 83.5% TD. The pressed samples were sintered at 1300°C in hydrogen.
[0094] After the sintering process, the density has increased to 87.7% TD. This density is insufficient to obtain the desired mechanical properties. Especially due to the low density caused by porosity, the impact properties are impaired.
[0...
Embodiment 2
[0100] Another test was performed using the same material as in Example 1. After the same pressing operation and sintering at 1250° C., the density is 85% TD. The material was soften annealed and then subjected to a further uniaxial pressing to a final green density of 92.3% TD. After this operation, the pressed product was sintered again at 1250° C. to a density of 95.2% TD. The sintered product was then inserted into a hot isostatic press and pressed to full density without encapsulation at a temperature of 1150° C. and a pressure of 1500 bar.
[0101] The microstructure of the product shows a homogeneous structure with uniformly dispersed carbides. After normal hardening and tempering to a hardness of 56HRC, the impact value of the test reaches 120-132J, which is a satisfactory value for many industrial production applications.
Embodiment 3
[0103] The same green product with 92.3% TD as in Example 2 was directly subjected to hot isostatic pressing at 1150°C. The product has a density of 99.2% TD. The microstructure reveals regions of high porosity, while other regions are fully dense. After the same hardening and tempering, the impact value is 15-85J, depending on the dispersed porosity of the product.
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Abstract
A method for the manufacture of a metal part, the method including the steps: a) compacting agglomerated spherical metal powder to a preform, b) debinding and sintering the preform to a part at a temperature not exceeding 1275° C., c) performing one of the following steps: i) compacting the part to a density of more than 95% of the theoretical density, or ii) compacting the part to a density of less than 95% of the theoretical density and sintering the part at a temperature not exceeding 1275° C. to a density of more than 95% of the theoretical density, and d) subjecting the part to hot isostatic pressing at a temperature not exceeding 1200° C. The method provides an industrial process to produce fully dense parts from alloys which normally cannot be produced and still give good impact properties, which is vital for many applications where there alloys are used.
Description
technical field [0001] The present invention relates to a method of manufacturing metal parts from agglomerated spherical metal powders. Background technique [0002] As we all know, powder metal technology has shown significant advantages in the manufacture of near net shape (near net shape) products. Products that cost less than traditional forged, cast and / or machined parts. In many cases, the properties of the powder metal products are superior. [0003] Due to the economy and energy saving of full density sintering of steel powder, this method has gained more and more attention. This method usually requires high sintering temperatures unless the steel powder is mixed with low melting point additives which act as a binder for the more high melting point powders. Two typical low melting point additives are copper and boron. However, these additives have adverse effects on some characteristics of steel products, such as welding and corrosion, and these kinds of additiv...
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