Home > News > Content
Influence Of Forging On Microstructure And Properties Of Metals
- Sep 14, 2017 -

Forging makes the metal plastic deformation, according to the temperature range of deformation and its effect, generally divided into cold deformation and thermal deformation. The cold deformation occurs at a lower temperature, causing the hardening of the process to increase its strength and hardness. Thermal deformation occurs at a higher temperature, and the change of strength and hardness cannot be seen after deformation. The temperature limit of dividing cold deformation and thermal deformation varies with the system of metal and alloy. The physical basis of dividing temperature is that, in the case of thermal deformation, the atom has a high self diffusion rate, which is sufficient to recover and recrystallization, and to counteract the deformation hardening effect. But the cold deformation can not occur fully recrystallization. Below concretely light-cooled, thermally deformed metal microstructure; In the first section, the Microstructure and properties of the cold deformed metal are widely used in the process of metal products. For example: Cold stamping, Leng, cold extrusion and cold top forging and other methods used to produce all kinds of parts and semi-finished products, with cold-rolled and cold, such as the production of small-caliber thin-walled seamless pipe, sheet, thin strip and wire. Cold deformation is not only the processing method to change the shape and size of the product, but also the effective measure to improve the microstructure and properties of the metal. The effect of cold deformation is to make the workpiece to harden, outstanding performance in the strength Limit (mouth B) and Brinell hardness (HB), as the degree of cold deformation increased, elongation (ancient%) and impact value (valve K) decreased (Fig. 3). Why do these results occur? When we opened the Metallographic sample and placed it under a microscope or under an electron microscope, it was found that after the deformation of metal, many tiny fragments were produced on the slip surface, and the lattice was distorted (see fig. 3-2). After the atom has left the stable equilibrium position, the inner energy can be raised, and the resistance of the continuous slip is increased, which results in the hardening of the cold deformed metal. Deformation hardening is an unstable tissue state. The atoms at high energy have a tendency to spontaneously revert to the low level to balance the steady state.

Copyright © Alfa-Sourcing. All Rights Reserved.