SU889732A1 - Iron-based alloy - Google Patents

Description

one

The invention relates to metallurgy, in particular to the search for alloys for the manufacture of a metalworking tool.

Known steel, for example R18F2K5, R6M5, R10F5K5 and others, which in addition to the alloying elements contain 0,8I, 0% carbon. A high carbon concentration results in the formation of eutectic components in the cast structure during crystallization of ingot D.

However, the presence of clusters of eutectic carbides gives rise to a number of serious shortcomings that worsen the technical and economic indicators of production and use of steel (low ductility, tendency to decarburize surface layers, rolled products and tools, the formation of mesh and banded structures in the deformed metal).

The closest to the invention to the technical essence and the achieved result is alloy 2D of the following chemical composition, wt.%:

0.1-0.2

Carbon

Silicon 0.2-2

Chrome 3-5 1-20

Tungsten 1-8

Vanadium

Molybdenum 2-10 1-15

Cobalt

10 0.02-2

Titanium 0.02-2

Zirconium 0.05-2

Niobium 0.001-0.005

Boron

0.05-0.1

Cerium

15

Iron Else

A disadvantage of the known alloy is low secondary hardness, flexural strength and heat resistance.

The aim of the invention is to increase the secondary hardness, flexural strength and heat resistance. 3 The goal is to achieve an iron-based alloy containing carbon, silicon, chromium, tungsten vanadium, molybdenum, cobalt, titanium, zirconium, niobium, boron, cerium, additionally contains nitrogen at the following ratio of components, wt.%: 0 , 1-0.2 Carbon 0.2-2 Silicon 3-5 1-20 Tungsten 1-8 Vanadium 2-10 Molybdenum 1-15 Cobalt 0.02-2 0.02-2 Zirconium 0.05-2 Niobium 0.001 -0.00 0.05-0.1 0.04-0.45 Rest of Iron

The introduction of nitrogen into the alloy extends the range of quenching temperatures due to the fact that nitrogen forms carbonitrides, which are stable at high temperatures and inhibit the growth of austendt grain with a single twofold increase in hardness and red hardness.

Claims (2)

The use of the proposed alloy for the manufacture of metalworking tools improves its cutting properties and durability, which increases the productivity of metal-working machines. 2 Nitrogen content less than 0.04% is inefficient, since it does not form excessive hardening phases (nitrides and carbonitrides). The nitrogen content above 0.45% reduces the hardness of the alloys due to the appearance of carbonitride mesh. The alloy is melted in an induction furnace. The chemical composition and properties of the proposed and known alloys are given in the table. Properties are evaluated on samples that are cemented in a HOB environment according to the following mode: cementation temperature 1150 ° C, exposure time 3.5 hours, cooling after cementation with a furnace. After cementation, the specimens are quenched in oil from 1200 s and tempering at three times I h. zirconium, niobium, boron, cerium, which is indicated in order to increase secondary hardness. flexural strength and heat resistance; it additionally contains nitrogen when following the ratio of the components to be used. D wo, Carbon 0.1-0.4 Silicon 0.2-2 Chromium 3-5 Tungsten 1-20 Vanadium 1-8 Molybdenum 2-10 8 Cobalt 1-15 Titanium 0.02-2 Zirconium 0.02-2 Niobium 0.05-2 Boron 0.001-0.005 Cerium 0.05-0.1 Nitrogen 0.04-0.45 Iron Else Sources of information taken into account during the examination:. 1. Materials In mechanical engineering. Handbook in 5 tons. Ed. Himushina FF, t.Z, M., Mashinostroenie, 1968. 2. USSR author's certificate number 378511, cl. C 22 C 38/30, 1970.