SU1217911A1 - Maraging steel - Google Patents

Description

one

The invention relates to metallurgy, more specifically to high-strength martensite-aging steel.

The purpose of the invention is to increase the strength of steel while maintaining ductility,

In the proposed steel, cerium and aluminum are introduced to increase the strength of the steel while maintaining ductility.

The limits of the content of alloying elements are determined by the nature of their influence on the structure and properties of steel.

Manganese is introduced into the steel to obtain a structure of carbon-free martensite having high strength and ductility. A decrease in the manganese content of less than 7% leads to the formation of a strong tensile structure with low strength after aging. When the manganese concentration is more than 12%, the alloy strength decreases due to the formation of stabilized austenite in the structure of this steel.

Tungsten contributes to the hardening of steel when martensite is diligent due to the occurrence of intermetallic

Steel

With uln. W Mo Si Ti j Al

Known

4 0.03 7.0 0.4 2.2 1.7 0.7

table 2

Steel djjj kgf / mm (jg kgf / mm S,% (fJ,%

ten

17911

phases. A decrease in the tungsten content of less than 5% weakly hardens the steel. An increase in the tungsten content of more than 12% leads to a decrease in plasticity 5 due to the appearance of an excess intermetallic phase in austenite.

Cerium is introduced into the steel as a refining additive, grinding grain and thereby increasing the plastic and strength properties of steel. The introduction of cerium in an amount of more than 0.1% leads to a decrease in plasticity due to its precipitation along grain boundaries, and the introduction in an amount of less than 0.005% does not have a refining and strengthening effect on the steel. The compositions of the steels are given in Table 1, Table 2 shows the mechanical properties of the investigated steels at room temperature (heat treatment mode; forging + aging at, 3 h).

25 The application of the proposed steel with higher strength will improve processability, reduce the consumption of alloying elements and reduce the weight of products.

Table 1

15

20

Fe

table 2

Claims (1)

MARTENSITY-AGING STEEL, containing carbon, manganese, tungsten, iron, characterized in that, in order to increase the strength of steel while maintaining ductility, it additionally contains cerium and the ratio Carbon Manganese aluminum in the following components, wt.%: 0.005-0.030 7-12 Tungsten 5-12 Cerium Aluminum Iron 0.005-0 ^ 100 0.1-1.0 Rest