Chapter 3 Heat Treatment Basis of Steel

日期:2020/1/14 9:10:16 / 阅读: / 来源:本站

Chapter 3 Heat Treatment Basis of Steel
Heat treatment refers to the heating, insulation and cooling of metal materials or workpieces in an appropriate way to
The process of obtaining the expected structure and performance. Among the metal materials used in machinery manufacturing, steel materials
It accounts for the largest proportion, so heat treatment of steel occupies a very important position. With the right and reasonable heat
Treatment, can significantly strengthen the steel to make full use of its inherent potential, and has a significant effect on improving product quality and life
important meaning.
The basic purpose of heat treatment is to
1) Eliminate defects in casting and forging blanks, improve internal organization and process performance, and make good for subsequent processes
Organizational preparation.
2) Improve the mechanical properties of steel, so as to fully utilize the potential of steel and extend the service life of mechanical parts
Life.
According to different heating and cooling methods, the commonly used heat treatment methods can be divided into the following:
1. Overall heat treatment The heat treatment process of penetrating heating the entire workpiece is called overall heat treatment.
The overall heat treatment of steel is mainly annealing, normalizing, quenching, and tempering.
Among them, annealing and normalizing are to adjust the original structure to ensure the final heat treatment of the workpiece (quenching and tempering)
Or (and) a heat treatment process performed in advance on the quality of the cutting process. And quenching and tempering as the final hot spot
The principle is a heat treatment process for obtaining the mechanical properties required for steel parts in use.
2. Surface heat treatment is to change the structure and properties of the surface of the workpiece, and only heat treat the surface
Of craft. Surface hardening is widely used in production, including induction hardening, flame hardening, laser hardening,
Electronic east quenching, contact resistance heating quenching, electrolyte quenching, etc.
3. Chemical heat treatment is to place the workpiece in a suitable active medium to heat, keep warm, and make one or several
A heat treatment that penetrates into the surface of an element to change its chemical composition, structure, and properties. Common chemistry
Heat treatment methods include carburizing, nitriding, carbonitriding, nitrocarburizing, sulfurizing, sulfur-nitrocarburizing, sulfur-nitrocarburizing
Infiltration, boronizing, siliconizing, zincizing, aluminizing, chromizing, vanadiumizing, chromium-aluminum infiltration, boron-aluminum infiltration, etc.

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