Basic Knowledge Of Metal Heat Treatment Introduction

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Metal heat treatment is a process in which a metal workpiece is heated to a suitable temperature in a certain medium, and after it is kept at this temperature for a certain period of time, it is cooled at different speeds.

Metal: A substance with opaque, metal luster, good thermal conductivity and electrical conductivity, and its electrical conductivity decreases with increasing temperature, and is rich in ductility and ductility. A solid (ie, crystal) in which the atoms inside the metal are regularly arranged.

Alloy: A substance composed of two or more metals or metals and non-metals with metallic characteristics.

Phase: The component of the alloy with the same composition, structure, and performance.

Solid solution: The introduction of metal heat treatment plants is a solid metal crystal of one (or several) component atoms (compounds) that dissolve into the lattice of another component, while still maintaining the lattice type of the other component, and the solid solution is divided into gaps. There are two types of solid solution and replacement solid solution.

Solid solution strengthening: As the solute atoms enter the gaps or nodes of the solvent lattice, the crystal lattice is distorted and the hardness and strength of the solid solution are increased.This phenomenon is called solid solution strengthening.

Compound: The chemical combination occurs between the alloy components to form a new crystal solid structure with metallic properties.

Mechanical mixture: An alloy composition composed of two crystal structures.Although it is a two-sided crystal, it is a component and has independent mechanical properties.

Ferrite: The interstitial solid solution of carbon in a-Fe (iron with body-centered cubic structure).

Austenite: The interstitial solid solution of carbon in g-Fe (face-centered cubic structure iron).

Cementite: a stable compound (Fe3c) formed by carbon and iron.

Pearlite: a mechanical mixture composed of ferrite and cementite (F+Fe3c contains 0.8% carbon)

Leeburite: a mechanical mixture composed of cementite and austenite (4.3% carbon)

Metal heat treatment is one of the important processes in mechanical manufacturing. Compared with other processing processes, heat treatment generally does not change the shape and overall chemical composition of the workpiece, but by changing the microstructure inside the workpiece, or changing the chemical composition of the surface of the workpiece , To give or improve the use performance of the workpiece. Its characteristic is to improve the internal quality of the workpiece, which is generally not visible to the naked eye.

In order to make metal workpieces have the required mechanical properties, physical properties and chemical properties, in addition to the reasonable selection of materials and various forming processes, heat treatment processes are often indispensable. Steel is the most widely used material in the machinery industry. The microstructure is complex and can be controlled by heat treatment, so the heat treatment of steel is the main content of metal heat treatment. In addition, aluminum, copper, magnesium, titanium, etc. and their alloys can also be heat treated to change their mechanical, physical and chemical properties to obtain Different performance.

Shanghai Geheng Vacuum Technology Co., Ltd. is a vacuum heat treatment furnace manufacturer with many years of experience in design, manufacturing and production. Mainly produce vacuum heat treatment furnace, vacuum sintering furnace, vacuum brazing furnace, New Energy And Environmental Protection Equipment and other vacuum equipments.Provide customized services, equipment work area can be based on customer output.