Method for improving wear resistance of surface of iron-based powder metallurgy product by electron beam remelting

An iron-based powder metallurgy and electron beam remelting technology, applied in the field of powder metallurgy, can solve the problems of insufficient surface mechanical properties of iron-based powder metallurgy products, and achieve the effects of small deformation of the workpiece, small heat input, and small thermal influence.

Inactive Publication Date: 2019-07-05
常熟市华德粉末冶金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention is aimed at the problem of insufficient surface mechanical properties of iron-based powder metallurgy products, and provides a method for effectively improving the hardness and surface wear resistance of iron-based powder metallurgy products

Method used

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  • Method for improving wear resistance of surface of iron-based powder metallurgy product by electron beam remelting
  • Method for improving wear resistance of surface of iron-based powder metallurgy product by electron beam remelting
  • Method for improving wear resistance of surface of iron-based powder metallurgy product by electron beam remelting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] First, the metal powder is formed by 23T pressure, and then sent to the mesh belt type sintering iron furnace for sintering. It is kept at 1000°C and 1080°C for 6 minutes, and at 1120°C for 30 minutes, and then slowly cooled in the furnace. During the sintering process, the furnace Into the hydrogen, prepared into iron-based powder metallurgy products.

Embodiment 2

[0028] First, the metal powder is formed by 23T pressure, and then sent to the mesh belt type sintering iron furnace for sintering. It is kept at 1000°C and 1080°C for 6 minutes, and at 1120°C for 30 minutes, and then slowly cooled in the furnace. During the sintering process, the furnace Hydrogen is introduced into the medium to prepare iron-based powder metallurgy products.

[0029] Fix the sintered powder metallurgy product on the workbench, seal the molding cavity and pump it to a high vacuum state; then use an electron beam with a current of 8mA to scan the surface of the sample with a voltage of 60kV, a scanning speed of 10mm / s, and maintain a heat output of 3J / mm , and then cut out a small middle part for inlaying, so as to observe the change of its cross-sectional properties later.

Embodiment 3

[0031] The difference between this embodiment and Embodiment 2 is that a 9 mA electron beam is used, and the voltage, scanning speed, and heat output of the electron beam remain unchanged.

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Abstract

The invention relates to a method for improving the wear resistance of a surface of an iron-based powder metallurgy product by electron beam remelting. The method comprises the following steps that firstly, iron-based alloy powder is pressed and sintered to prepare the iron-based powder metallurgy product; the sintered powder metallurgy product is fixed to a workbench, and a molding cavity is sealed and pumped to a high vacuum state; and high-energy electron beam scanning is performed on the surface of the product, so that the surface of the product is molten, and rapidly solidified. Accordingto the electron beam surface remelting iron-based powder metallurgy product prepared through the method, a martensite remelting layer structure with fine grains and uniform structures is formed aftercooled to the room temperature, and the hardness and the wear resistance of the product can be remarkably improved by the surface remelting layer.

Description

technical field [0001] The invention relates to the field of powder metallurgy, in particular to a method for improving the surface wear resistance of iron-based powder metallurgy products through electron beam remelting. Background technique [0002] Powder metallurgy is a process technology for preparing metal materials, composite materials and various types of products by taking metal powder as raw material, forming and sintering it. Due to the advantages of high raw material utilization rate, low manufacturing cost, near-net shape and high product precision, powder metallurgy technology has been more and more widely used in the automobile industry. However, due to problems such as low densification and uneven distribution of powder metallurgy products, their mechanical performance indicators have been reduced, and they cannot meet the performance requirements for parts with high load bearing and high friction and wear resistance. [0003] At present, the most commonly u...

Claims

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Application Information

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IPC IPC(8): B22F3/24B22F3/02B22F3/10C22C38/16C22C38/08C22C38/12
CPCB22F3/02B22F3/10B22F3/24C22C38/08C22C38/12C22C38/16
Inventor 张莎莎杨海屹刘子利姚正军陶学伟陆贤文邹德华
Owner 常熟市华德粉末冶金有限公司
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