SU1497254A1 - Alloying mixture - Google Patents

Abstract

This invention relates to mixtures for surface alloying of high carbon steel castings in casting molds. The purpose of the invention is to increase the depth of the doped layer while maintaining high wear resistance of castings. The alloying mixture includes titanium and graphite powders in the following ratio, wt.%: Titanium powder 92-97

graphite powder 3-8. As a result of diffusion of titanium and carbon during the crystallization of the iron-carbon melt, the depth of the doped layer increases by 5-6 times and reaches 40-70 mm while maintaining high wear resistance of the 110G13L steel castings doped with a mixture of working sections. 1 tab.

Description

The invention relates to foundry, in particular, to mixtures for the superficial alloying of high carbon steel castings in casting molds.

The purpose of the invention is to increase the depth of the doped layer while maintaining high wear resistance of the casting,

This goal is achieved by the fact that the alloying mixture consisting of titanium and carbon-containing material contains titanium powder as a titanium-containing material, and graphite powder as a carbon-containing material in the following ratio of components, wt.%:

Titanium powder 92-97.

Graphite powder 3-8

Enter these components in the composition of the alloying mixture provides

due to the diffusion of carbon and titanium in the surface layers of the casting, the increased depth of the doped layer and the wear resistance due to the formation of dispersed titanium carbides.

With an increase in the content of graphite powder in a mixture of more than 10% in the steel structure, there are undissolved inclusions of graphite, which reduces its wear resistance. When the content of graphite in the mixture is less than 3%, the depletion of the surface layers of steel with carbon occurs, which leads to a decrease in its mechanical and operational properties.

To test the mixtures, titanium metal with a particle size of not more than 1 mm, sponge titanium with a particle size of not more than 2-3 mm, carbon black and silver graphite were used.

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The prepared mixtures were dried at and poured onto the surface of the mold in the amount of 1.5-3 g / cm. A paste of a known alloying mixture was applied to the bottom of a 10 mm thick mold. Melt of steel 110G13L at 1490-1510 ° C was poured into the dried form. At the same time received 3 samples with different composition of the mixture,

Samples were subjected to metallographic, and maz; nitometric control, wear resistance was determined on a friction machine Ml. The compositions of the tested mixtures and the test results are shown in the table,

As follows from the above data, the best results are obtained when using a mixture of a composition that allows

increase the depth of the doped layer 1

5-6 times while maintaining high nasostoykost,

Claims (1)

Invention Formula An alloying mixture mainly for surface alloying of high carbon steel woks containing titanium and carbon-containing materials, is different. so that, in order to increase the depth of the doped layer while maintaining high wear resistance, it contains titanium powder as a titanium-containing material, and in the quality of a carbon-containing material, graphite powder with the following component ratioJ Maci%: Titanium powder 92-97 Graphite powder 3- eight