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A kind of tungsten carbide reinforced steel and its preparation method

A technology of tungsten carbide and steel strengthening, which is applied in metal processing equipment, transportation and packaging, coating, etc., can solve the problems of inaccurate control of size, volume fraction shape and distribution, and affect the strengthening effect of tungsten carbide, so as to achieve low cost, Effects of removal of inclusions and improvement of purity

Active Publication Date: 2021-08-03
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, tungsten carbide is mainly precipitated in iron and steel materials through the adjustment of the heat treatment process. Except that its size, volume fraction, shape and distribution cannot be precisely controlled, the tungsten in the solid solution of tungsten steel during heat treatment and high temperature use Very prone to harmful Laves phase (Fe 2 Precipitation in the form of W) affects the strengthening effect of tungsten carbide

Method used

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  • A kind of tungsten carbide reinforced steel and its preparation method
  • A kind of tungsten carbide reinforced steel and its preparation method
  • A kind of tungsten carbide reinforced steel and its preparation method

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preparation example Construction

[0033] The preparation method of the tungsten carbide strengthened steel of the present invention mainly comprises three steps of coating of tungsten carbide, encapsulation of tungsten carbide and release and dispersion of tungsten carbide:

[0034] (1) Coating of tungsten carbide

[0035] Put the pure iron powder, tungsten carbide and dispersant in the ball mill to mix the materials, so that the surface of the tungsten carbide powder is coated with a layer of metallic iron.

[0036](2) Packaging of tungsten carbide (see Figure 1(a) and Figure 1(b))

[0037] The steel to be strengthened is forged into a round rod electrode 1, and the surface of the round rod electrode 1 is polished; 4N diameters d are drilled on the surface of the round rod electrode 1 0 =1~5mm, depth h 0 = 1 to 2 cm circular packaging holes 2; each group of 4 packaging holes 2 is evenly distributed on the same circumference of the round rod electrode 1, and the round rod electrode 1 is evenly distributed in...

Embodiment 1

[0042] The steel to be strengthened in this embodiment is T91 steel, and the preparation method mainly includes three steps: coating of tungsten carbide, encapsulation of tungsten carbide and release and dispersion of tungsten carbide:

[0043] (1) Coating of tungsten carbide

[0044] Put the pure iron powder, tungsten carbide and dispersant in the ball mill to mix the materials, so that the surface of the tungsten carbide powder is coated with a layer of metallic iron.

[0045] (2) Packaging of tungsten carbide

[0046] Forge T91 steel to be strengthened into a round rod electrode 1 with a diameter of 60mm and a length of 2.5m, and polish the surface of the round rod electrode 1; On the same cross-section of the electrode 1), four circular packaging holes 2 are evenly distributed, and the diameter of the circular packaging hole 2 is d 0 = 2mm, depth h 0 = 1.5cm, the distance between two adjacent rows of packaging holes 2 = 2cm; the coated tungsten carbide powder is divided...

Embodiment 2

[0052] The strength to be strengthened in this embodiment is P92, and the preparation method mainly includes three steps of tungsten carbide coating, tungsten carbide packaging and tungsten carbide release and dispersion:

[0053] (1) Coating of tungsten carbide

[0054] Put the pure iron powder, tungsten carbide and dispersant in the ball mill to mix the materials, so that the surface of the tungsten carbide powder is coated with a layer of metallic iron.

[0055] (2) Packaging of tungsten carbide

[0056] Forge the P92 steel to be strengthened into a round rod electrode 1 with a diameter of 65 mm and a length of 3 m, and polish the surface of the round rod electrode 1; On the same cross-section), four circular packaging holes 2 are evenly distributed, and the diameter of the circular packaging hole 2 is d 0 = 5mm, depth h 0 = 2cm, the distance between two adjacent rows of packaging holes 2 = 5cm; the coated tungsten carbide powder is divided into 60 parts, and each part i...

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Abstract

The invention discloses a tungsten carbide reinforced steel and a preparation method thereof, comprising the following steps: ball milling and mixing iron powder, tungsten carbide and a dispersant so that the surface of the tungsten carbide powder is coated with an iron layer; processing the steel to be strengthened into a round rod electrode, And clean the surface, evenly open packaging holes on the electrodes, fill each packaging hole with an equal amount of coated tungsten carbide powder, and then seal all the packaging holes; for round rods packaged with tungsten carbide The electrode undergoes electroslag remelting. In the process of electroslag remelting, the steel to be strengthened is melted into droplets, and tungsten carbide is released and absorbed by the droplets, so that tungsten carbide and molten steel are evenly mixed and solidified in the water-cooled crystallizer. , making tungsten carbide uniformly dispersed in solid steel to obtain the tungsten carbide reinforced steel. In the invention, the tungsten carbide of the second-phase strengthening particles is evenly distributed in the steel through smelting, the preparation process is precise and controllable, and the size and quantity of the tungsten carbide can ensure the strengthening effect of the tungsten carbide.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a tungsten carbide reinforced steel and a preparation method thereof. Background technique [0002] The second phase strengthening is an important strengthening method of steel materials. When the second phase is uniformly distributed in the matrix phase with fine and dispersed particles, it will produce a significant strengthening effect, which is called second phase strengthening. The main reason for the strengthening of the second phase is the interaction between them and dislocations, which hinders the movement of dislocations and improves the deformation resistance of the alloy. For the movement of dislocations, the second phase contained in the alloy has the following two situations: 1. The strengthening effect of non-deformable particles; 2. The strengthening effect of deformable particles. At the same time, when the second phase particles a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12C22C33/04B22F1/02C22B9/18B22F9/04B82Y30/00
CPCC22C38/12C22C33/04B22F9/04C22B9/18B82Y30/00B22F2009/043B22F1/17
Inventor 邱国兴彭宇
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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