SU1532596A1 - Method of high-temperature thermomechanical treatment of high-speed steels - Google Patents

Abstract

The invention relates to the field of metallurgy, in particular to the field of high-temperature thermomechanical treatment of steel products, and can be used in tool manufacturing. The purpose of the invention is to increase the impact strength of high-speed steels. The method includes heating the blanks to quenching temperatures, hot plastic deformation followed by cooling. Ultrasonic vibrations are applied to the workpiece directly when it is deformed to the deformed part of the workpiece with an amplitude not less than the length of the free path of dislocations, but not more than the size of the resulting grain. 1 ill., 1 tab.

Description

. The invention relates to metallurgy, in particular to high temperature. thermomechanical processing of steel products, and can be used in tool manufacturing.

The purpose of the invention is to increase the toughness of high-speed steels.

In the drawing, a diagram for implementing the method.

The left part of the drawing (a) shows the diagram in the initial state, on the right part (b) the position at the moment of deformation. The workpiece 1 (a) of high-speed steel is heated to quenching temperatures, and then podstuzhivayut to strain temperatures 950-1150 C with the imposition of ultrasonic vibrations. At the same time, the imposition of ultrasonic vibrations during heating and cooldown contributes to more b1,1 bromine and complete solidification of the solid solution by alloying elements and carbon, as a result of which high values of hardness and wear resistance of the tool are obtained. After that, the workpiece 1 is placed in the container 2 on the matrix 3 front body, the insert 4 is placed on top of the workpiece from an intermediate medium material, such as graphite, and then deformed by a punch 5. Ultrasonic transducer 6 is installed at the output of the forming part of the matrix 3, device 7, located under the supporting surface of the matrix 3.

During plastic deformation (b), the workpiece 1, together with the material 4 of the intermediate medium, expires along the cone of the matrix 3, and then as the product leaves the forming part of the matrix 3 directly to the shape of

with y

SP

;about

O5

This part of the workpiece is supplied with: ultrasonic vibrations using

generator 6. Converter 6

Together with the deformable - division with a constant acoustic touch, which provides compression of the transducer to the reference part of the workpiece and co. Asuya grease applied to the work-JQ, and the end of the converter. With the 3rd guise of the amplitude of ultrasonic vibrations applied to the workpiece, it is no less than the length of the free overrun of dislocations, but no more than 5 times

ra obtained grain.

Example. The method was used at BT1Yu cylindrical billet made of steel RbM5 with a diameter of 20 mm using hot hydrodynamic high

infusion. The initial billet was heated on a HDTV unit with a speed of .. 40 ° C / s to, and then with an orbity of 60 ... 70 ° C / s to an acale temperature of 1210 ° C, after which 25

shi to the temperature of deformation by the simultaneous imposition of ultrasonic oscillations supplied to the workpiece with the help of a magnetostrictive exponential generator

thirty

-ina from installation UZLN-2. Deformed 16 was brought on a K2130C press with a force of 100 kN in a special stamp. Heat The billet with a graphite insert was placed in a stamp container at the entry, r, and surface of the forming matrix. At the output of the workpiece from form-forming. parts of the matrix are set by the L1 magnetostriction transform; of the exponential type for transduction of ultrasonic oscillations into a preformed billet. When plasti-

Q, 5

about

five

0

r

Q

As the product leaves the forming part of the matrix, ultrasonic vibrations with an amplitude of 1 μm are transmitted to the deformed section of the workpiece. In the process of deformation in order to maintain acoustic contact, the pressing force of the transducer to the deformed section of the workpiece remained constant, and the transducer had the ability to move together with the resulting product through a quenching device. In addition, a matching carbolide grease was applied to the working end of the converter.

The table shows the properties of steel RbM5 after processing according to the known and proposed methods.

Claims (1)

As can be seen from the table, the steel treated according to the proposed method has a greater viscosity, which makes it possible to increase the durability of the cutting tool. Invention Formula The method of high-temperature thermomechanical treatment of high-speed steels, including heating billets to quenching temperatures and pressing to hot deformation temperature, carried out with the imposition of ultrasonic vibrations and hot plastic deformation followed by cooling, which is similar to the fact that viscosity, ultrasonic vibrations additionally impose on the workpiece directly during its deformation to the deformed part of the workpiece with an amplitude not less than the length free path of dislocations, but not more than the size of the resulting grain.  The austenitic grain size was determined on samples obtained without sub-ultrasonic vibrations.  The density of dislocations was determined by the method described in the journal Physics of Metals and Metallurgy, 1968, p. 25, p. 140-151.