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Preparation method for surface-strengthened Fe-W alloy

A surface strengthening and alloying technology, which is applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of long carburizing time and large hardness gradient of carburizing layer, so as to reduce carburizing energy consumption, The effect of structure refinement and shortening carburizing time

Active Publication Date: 2014-04-30
INNER MONGOLIA UNIV OF SCI & TECH
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Problems solved by technology

[0005] The W-containing iron-based binary alloy is cheap and has good plasticity and toughness. After carburizing, Fe will form on the surface 3 C and WC greatly increase the hardness and wear resistance of the surface. However, after carburizing, the hardness gradient of the carburizing layer on the surface is large, and the carburizing takes a long time.

Method used

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  • Preparation method for surface-strengthened Fe-W alloy
  • Preparation method for surface-strengthened Fe-W alloy

Examples

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Embodiment 1

[0021] The mass percentage of Fe-W alloy composition is: W5.5%, Fe94.5%. The Fe-W alloy sample was made into a 20×20×50 sample with a wire cutting machine, polished with 240#, 800# and 1200# water sandpaper in turn, cleaned with ultrasonic waves in distilled water, and then dried.

[0022] Dissolve lanthanum chloride in methanol to make a rare earth mixed infiltration agent. The ratio of lanthanum chloride to methanol is 3 grams: 1000ml. Choose isopropanol as carburizing agent.

[0023] The carburizing temperature is 860°C, the carburizing time is 4 hours, and the carbon potential of the furnace gas during the carburizing stage is kept at Cp=1.15%±0.05%. After carburizing, the workpiece is water quenched.

[0024] figure 1 and figure 2 The scanning electron micrographs of the surface and longitudinal section of the alloy carburized layer made in this embodiment are respectively.

[0025] In this example, the rare earth infiltration process can refer to http: / / wenku.baidu...

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Abstract

The invention discloses a preparation method for a surface-strengthened Fe-W alloy. The Fe-W alloy is subjected to carburizing treatment by utilizing a rare earth infiltration catalysis process, and is subjected to water cooling and quenching after the carburization is completed. The Fe-W alloy prepared by the invention is low in cost; after the carburization is performed by utilizing a rare earth infiltration catalyst, the carburization time can be effectively shortened, the carburized layer depth can be increased, the carburized layer hardness gradient can be reduced, the tissue of the carburized layer is refined, the carbide dispersivity is increased, the high hardness is kept, and meanwhile, the alloy has high toughness.

Description

[0001] technical field [0002] The invention relates to a method for preparing a surface-strengthened Fe-W alloy, which belongs to the field of alloy steel and surface heat treatment. Background technique [0003] Due to its relatively low cost, iron-based alloys still play an important role in national production and life. In order to make iron-based alloys have higher hardness and wear resistance, elements such as C, W, Mo and Cr are usually added to the alloy to achieve the purpose of strengthening by forming carbides and changing the law of phase transformation. In some occasions, only the surface of the component needs to have high hardness, while the interior maintains high plasticity and toughness. The use of materials such as tool steel and high-speed steel in these occasions will bring problems such as difficult machining and high cost. [0004] In response to this demand, a low-alloy steel grade is generally developed, combined with surface strengthening technol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/46C23F17/00
Inventor 王海燕高雪云刘杰侯景利
Owner INNER MONGOLIA UNIV OF SCI & TECH
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