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Mixed steel powder containing mn for powder metallurgy and preparation method thereof

A technology for powder metallurgy and alloy steel powder is applied in the field of Mn-containing mixed steel powder for powder metallurgy and its preparation. Good pressing performance, enhance strengthening effect, good pressing performance

Inactive Publication Date: 2016-02-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method also has the following problems: the Mn element is easy to combine with oxygen in the smelting water atomization preparation process, and when the Mn content is high, the oxygen content of the Mn-containing water atomized pre-alloyed steel powder is high, and because the Mn element has an effect on the pre-alloyed steel powder The strengthening effect of Mn-containing water atomized pre-alloyed steel powder has high hardness and lower compaction performance than that of Mn-containing mechanically mixed powder with the same composition. Higher requirements for presses and pressing molds, increasing production costs
However, under industrial production conditions, due to the high dew point of the sintering atmosphere (-30°C to -25°C), the activity of FeMn alloy or electrolytic manganese powder is high. It has been reported that when the mass percentage of Mn exceeds 2%, the mechanical In the position of FeMn alloy or electrolytic manganese powder inside the compact made of mixed powder, during the degreasing and heating process before high-temperature sintering, Mn evaporates, oxidizes and deposits on the adjacent iron-based powder particles, and is easy to connect to form a Mn-containing oxide network. Once the oxide network is formed, in the subsequent high-temperature sintering process, the sintering atmosphere cannot permeate and diffuse into the oxide network to reduce the internal oxide, resulting in high oxygen content in the final sintered product, which has a negative effect on sintering densification and The mechanical properties of the products all have negative effects. In severe cases, the Mn-containing oxides can split the matrix and be brittle when loaded, causing immeasurable serious consequences.

Method used

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  • Mixed steel powder containing mn for powder metallurgy and preparation method thereof
  • Mixed steel powder containing mn for powder metallurgy and preparation method thereof
  • Mixed steel powder containing mn for powder metallurgy and preparation method thereof

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Effect test

Embodiment 1

[0048] The composite manganese source powder was used to prepare Mn-containing mixed powder, and the composition was Fe-XMn-0.6C (wherein X was 1, 2, 2.5, 3).

[0049] Composition of Mn-containing mixed powder prepared from composite manganese source powder: 60wt.% composition is Fe-X 1 Mn-0.6C (where X 1 1, 2, 2.5, 3) simple mechanical mixing powder, composed of water atomized pure iron powder, FeMn alloy powder, graphite powder. Among them, the iron content of water atomized pure iron powder is >99.6wt%, the oxygen content is ≤0.15wt%, and the average particle size is 100-150 μm; the FeMn alloy powder has a manganese content of 50wt%, an oxygen content of ≤1.5wt%, and an average particle size of 10μm; graphite, the average particle size is 20μm. 40wt.% composition is Fe-X 2 Mn-0.6C (where X 2 1, 2, 2.5, 3) pre-alloyed steel powder mixed powder, composed of pre-alloyed steel powder (composition is Fe-X 2 Mn-0.02C), graphite powder. Among them, the average particle size ...

Embodiment 2

[0057] The Mn-containing mixed powder prepared by using composite manganese source powder is Fe-XMn-0.6C (wherein X is 1, 2, 2.5, 3).

[0058] Composition of Mn-containing mixed powder prepared from composite manganese source powder: 30% of the composition is Fe-X 1 Mn-0.6C (where X in Table 4.1 1 1, 2, 2.5, 3) simple mechanical mixing powder, composed of water atomized pure iron powder, FeMn alloy powder, graphite powder. Among them, the iron content of water atomized pure iron powder is >99.6wt%, the oxygen content is ≤0.15wt%, and the average particle size is 100-150 μm; the FeMn alloy powder has a manganese content of 70wt%, an oxygen content of ≤1.5wt%, and an average particle size of 10μm; graphite, the average particle size is 20μm. 70wt% composition is Fe-X 2 Mn-0.6C (where X 2 1, 2, 2.5, 3) pre-alloyed steel powder mixed powder, composed of pre-alloyed steel powder (composition is Fe-X 2 Mn-0.02C), graphite powder. Among them, the average particle size of the pr...

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Abstract

The invention discloses Mn-contained mixture steel powder for powder metallurgy and a preparing method. The Mn-contained mixture steel powder is composed of water atomization pure iron powder, Mn-contained water atomization pre-alloyed steel powder, FeMn alloy powder, graphite powder and a lubricant, wherein the mass percentage content of Mn is lower than or equal to 3%. The preparing method includes the steps of preparing the components and mechanically and evenly mixing the components. The pressing performance and the sintered density of the prepared mixture steel powder are superior to the pressing performance and the sintered density of the Mn-contained water atomization pre-alloyed steel powder with the same components, and compared with a finished product obtained by sintering conventional Mn-contained mechanical mixture powder with the same contents, a sintered finished product is lower in oxygen content and high in density. The content of the Mn can be as high as 3%. The Mn-contained mixture steel powder is reasonable in component matching and high in Mn content, the prepared Mn-contained mixture steel powder combines the advantages of even Mn-element distribution in the Mn-contained pre-alloyed steel powder and the good pressing performance of the conventional Mn-contained mechanical mixture powder, the pressing performance is good, the sintered finished product is low in oxygen content and high in density, and the Mn-contained mixture steel powder is suitable for industrial production.

Description

technical field [0001] The invention relates to a Mn-containing mixed steel powder for powder metallurgy and a preparation method thereof, belonging to the technical field of powder metallurgy. Background technique [0002] Due to its advantages of energy saving, material saving, and near-net shape, powder metallurgy technology is widely used in the preparation of metal parts in industrial production, of which iron-based powder metallurgy materials account for the vast majority. Due to the needs of industrial applications, simply using water-atomized pure iron powder as the raw material for the production of iron-based powder metallurgy materials cannot meet the final performance requirements, so it is usually added to water-atomized pure iron powder by mechanical mixing or pre-alloying Alloying elements to improve its properties. Water atomized pure iron powder contains a small amount of Mn, which is brought in from iron ore, and its content is generally not higher than 0....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00C22C38/04
Inventor 李松林王行李志友刘咏陈荟竹龙安平
Owner CENT SOUTH UNIV
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