所属分类：常见问题 发布时间：2020-11-23 14:19:52 来源：http://www.lcnmb500.com 浏览量：
The properties of hardox450 wear-resistant plate material are realized by proper structure, and the same is true for wear-resistant parts working under wear condition. The common wear-resistant materials of steel have the following types
(1) Single organization
The single structure of hardox450 wear-resistant plate materials is martensite, bainite, pearlite and austenite. The wear resistance of alloy in different structures will change greatly with different content and carbon content. In practice, martensite has high hardness, good wear resistance and easy to obtain, and it is used more. At the same hardness level, bainite structure has higher wear resistance than martensite. Therefore, how to obtain bainite structure has become the focus of the research on wear-resistant materials of steel. The single pearlite has been eliminated because of its low hardness and high abrasion; The single austenite structure material is represented by high manganese steel. Although the hardness is low, it will be hardened by processing under the impact wear and achieve a higher surface hardness. Therefore, it can also obtain better wear resistance under high impact conditions, but it is not wear-resistant when the impact strength is not enough to make the surface fully hardened. This has been proved by the engineering practice.
(2) Polyphase tissue
The purpose of the study is to improve the toughness and good toughness of hardox450 wear-resistant plate, and the single structure can not obtain high wear resistance. For example, martensite and bainite structure have better toughness than single-phase martensite and higher hardness than single-phase bainite, so they have better wear resistance. Although from the perspective of corrosion resistance, the potential difference between phases and interface increases by the complex phase structure will also promote electrochemical corrosion, which leads to the deterioration of wear resistance under the condition of corrosion, but the martensite with excellent performance is obtained. The bainite complex structure is still beneficial to the improvement of the life of the workpiece.
(3) Matrix + carbide
The "matrix + carbide" structure usually has good wear resistance, because carbide has high hardness, which can be distributed in the matrix to support and prevent the grinding particles from entering or cutting. The design of such materials shall be in accordance with the following two principles:
a) When improving the overall hardness of hardox450 wear-resistant plate, it is necessary to consider reducing the hardness difference of matrix and carbide as much as possible under the condition of the allowable change of structure. According to this principle, the matrix structure should be made of the equine, bainite or their composite structure with high hardness. The hardness of pearlite is low, and the high carbon steel, high carbon alloy steel and ordinary white iron of pearlite + carbide type are worn and easily broken, and have been eliminated basically. But the smaller structure of the trochanter has a higher hardness and good toughness, which can be used as a good matrix.
b) In order to ensure the high hardness of hardox450 wear-resistant plate, it is necessary to consider improving toughness. The toughness of matrix + carbide type materials is poor, mainly due to the presence of carbides, so controlling the shape, quantity, distribution and type of carbides is the main means to improve the toughness of the materials.
(4) Matrix decarbonides + graphite
The matrix is generally martensite or bainite, graphite is spherical, and the material has a high hardness. Many experiments show that the introduction of spherical graphite can improve the toughness of wear resistance. The high wear resistance of the material can be maintained by saving a certain amount of eutectic carbide. But when the toughness is more important, it is also possible to avoid the high wear resistance of the material. However, when the toughness is more important, it is also possible to avoid the eutectic carbide, and the carbon is completely in the form of graphite.