High-hardness and high-abrasion-resistance ledeburite alloy cast iron

Abstract

High hardness and high wear resistance ledeburite alloy cast iron, which belongs to the field of powder metallurgy technology, is composed of the following raw materials in mass percentage, C 1.8%; Si 0.5%; Mn 0.25%; S 0.015%; P 0.025%; Cr 2.5%; Mo 1.25%; V 0.8%; Nb 0.16%; RE 0.05%; Ni 0.12%; W 0.30%; the rest is Fe and impurities. In order to improve the surface hardness of the alloy cast iron, the surface carburizing treatment is carried out after the alloy cast iron is formed, and the surface quenching treatment is carried out after the carburization is completed, which improves the hardness of the gear teeth and the surface strength of the gear teeth, reduces the wear of the tooth surface, and through normalizing And tempering treatment improves the internal mechanical properties of alloy cast iron, and its toughness and fatigue strength have been greatly improved. After the entire heat treatment is completed, grinding treatment is also used to improve the mechanical properties of the surface, especially the passivation of the surface. The stress, the service life of alloy cast iron has been greatly improved, to meet a variety of high load, high wear requirements.

Description

technical field

[0001] The invention belongs to the technical field of powder metallurgy and relates to an alloy cast iron, in particular to a ledeburite alloy cast iron with high hardness and high wear resistance. Background technique

[0002] Cast iron is a general term for alloys mainly composed of iron, carbon and silicon. Cast iron can be divided into: gray cast iron, white cast iron, malleable cast iron, nodular cast iron, vermicular cast iron and alloy cast iron.

[0003] Alloy cast iron is obtained by adding appropriate amount of alloying elements (such as silicon, manganese, phosphorus, nickel, chromium, molybdenum, copper, aluminum, boron, vanadium, tin, etc.) to ordinary cast iron. Alloying elements change the matrix structure of cast iron, so that it has corresponding properties such as heat resistance, wear resistance, corrosion resistance, low temperature resistance or non-magnetic properties. Among them, gray cast iron in alloy cast iron is the most widely...