Preparation method of high-chromium cast iron powder dispersion distribution wear-resistant composite material

Abstract

The invention discloses a preparation method of a high-chromium cast iron powder dispersion distribution wear-resistant composite material, and belongs to the technical field of metal wear-resistant composite material preparation. The method is characterized by comprising the following steps: (1) polishing the surface of a carbon steel plate, removing oxide skin and other impurities, and milling grooves; (2) compacting high-chromium cast iron powder, filling the high-chromium cast iron powder into the groove to form a composite plate blank, and welding and sealing the composite plate blank; and (3) the composite plate blank is subjected to multi-pass hot rolling deformation, so that the filled high-chromium cast iron is fused into a base body in the carbon steel deformation process, a composite material with high-chromium cast iron powder distributed in the carbon steel base body in a dispersed mode is formed, and therefore the abrasion-resistant composite material with the high-chromium cast iron distributed in the dispersed mode is prepared. The prepared composite material has good wear resistance and toughness. The production efficiency can be improved, the production period is shortened, the product quality is optimized, and the method is suitable for batch production.

Description

Technical Field

[0001] The invention belongs to the technical field of preparation of metal wear-resistant composite materials, and in particular relates to a method for preparing a high-chromium cast iron powder dispersed distribution wear-resistant composite material. Background Art

[0002] Metal wear-resistant materials are widely used in mining, construction, coal power, petroleum and other fields. As a metal wear-resistant material with excellent performance, high chromium cast iron has high hardness and good wear resistance and is widely used in various industrial fields. However, due to its low toughness, its use in working conditions with large impact is limited.

[0003] In order to give full play to the wear resistance of high chromium cast iron and improve its toughness, high chromium cast iron is combined with low carbon steel with good toughness, and high chromium cast iron powder with good wear resistance is used as a reinforcement layer, and a bimetallic composite plate is composited by surfacing and other methods. However, the layered composite material prepared by the above method has low bonding strength, complex production process, low production efficiency, and is not suitable for mass production. Summary of the invention

[0004] The purpose of the present invention is to provide a method for preparing a wear-resistant composite material with dispersed distribution of high-chromium cast iron powder, so as to realize mass production of continuous composite materials.

[0005] The implementation steps of the present invention are as follows:

[0006] 1) High chromium cast iron powder is selected and mixed with 50-100 mesh, and the surface of the carbon steel layer slab is mechanically polished to remove oxide scale and impurities, and cleaned with nitric acid and alcohol and blown dry, and a groove of a certain depth is evenly milled on the carbon steel plate, and the high chromium cast iron powder is filled into the groove and vibrated to compact, and another carbon steel plate is taken to cover the assembly, and welded along the joint surface to form an assembly;

[0007] 2) The combined slab is rolled through a rolling mill, and multiple hot rolling is performed according to the plate specifications, with a reduction of 20% to 40% per pass and a rolling temperature of 1100 to 1200° C.;

[0008] 3) Air cooling after rolling.

[0009] Advantages and positive effects of the present invention:

[0010] The present invention provides a method for preparing a wear-resistant composite material with dispersed high-chromium cast iron powder that is easy to operate. The specifications of the composite material are increased by selecting the thickness of the assembly plate layer and controlling the proportion of the mesh size of the high-chromium cast iron powder. During the rolling process, the carbon steel plate with a large thermal deformation amount is used to flow, so that the filled high-chromium cast iron is integrated into the matrix during the deformation of the carbon steel, forming a composite material in which the high-chromium cast iron powder is dispersed in the carbon steel matrix, and the composite material combines the good wear resistance of the high-chromium cast iron and the good toughness of the carbon steel matrix. Compared with the prior art, the present invention can improve production efficiency, shorten production cycle, optimize product quality, and is suitable for mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the assembly method;

[0012] Figure 2 This is a schematic diagram of rolling production;

[0013] In the figure: 1 is high chromium cast iron powder; 2 is carbon steel plate substrate; 3 is composite plate assembly. DETAILED DESCRIPTION

[0014] A high chromium cast iron dispersion composite material is prepared by using a three-layer composite slab composed of high chromium cast iron (KmTBCr26) and carbon steel (Q235). The preparation steps are as follows:

[0015] 1) If Figure 1 As shown, carbon steel plates with thicknesses of 2 mm and 6 mm are taken respectively, grooves of the same depth are evenly milled on the 6 mm carbon steel plate, high chromium cast iron powder is filled into the grooves and pressed until dense, the 2 mm carbon steel plate is covered, and welding is performed along the joint surface to form a composite plate assembly structure.

[0016] 2) The assembled composite slab is placed in a heating furnace and heated to 1300°C and kept warm for 1 hour, and then rolled using a two-roll mill. The rolling temperature is between 1100°C and 1200°C, and three hot rolling passes are performed. The reduction in each pass is 30%, and the rolling speed is 0.1 m / s. Figure 2 As shown, the low carbon steel layer is extended and deformed by rolling deformation, and the high chromium cast iron powder enters the low carbon steel matrix under the action of the roller, forming a composite material of high chromium cast iron dispersed in the carbon steel matrix;

[0017] 3) Air cooling after rolling.

Claims

1. A method for preparing a wear-resistant composite material of dispersed high chromium cast iron powder, which is formed by rolling, characterized in that: 1) Considering the economic requirements of the production process, high chromium cast iron powder is selected to be mixed with 50-100 mesh, the carbon steel surface is mechanically polished to remove oxide scale and impurities and evenly milled, and it is cleaned with dilute nitric acid and alcohol and blown dry, and the high chromium cast iron powder is vibrated and filled into the carbon steel plate groove, and covered with a layer of carbon steel plate; 2) Welding and sealing the combined slabs; 3) The combined slab is rolled through a rolling mill, and multiple hot rolling is performed according to the plate specifications, with a reduction of 20% to 40% per pass and a rolling temperature of 1100 to 1200° C. The filled high chromium cast iron is integrated into the matrix during the deformation of the carbon steel, forming a composite material in which high chromium cast iron powder is dispersed in the carbon steel matrix.

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