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Normalizing, annealing, quenching in the end What is the difference? 0 replies,5105 views

Annealing Annealing is the production of steel commonly used in the preparation heat treatment process. Most of the machine parts and engineering, mold the rough after annealing can eliminate the casting, forging and welding parts and components of the stress inhomogeneity; to improve and adjust the mechanical properties of steel, as well organized for the next process . On the performance of less demanding, less important parts and some general casting, welding parts, annealing can be used as the final heat treatment. Annealed steel is to heat the steel to a suitable temperature, holding a certain time, and then slowly cooling to get close to the equilibrium microstructure heat treatment. The purpose of annealing uniform chemical composition, mechanical properties and improved process performance, eliminate or reduce stress and prepare organizations for parts for the final heat treatment. Many types of steel annealing process, according to the heating temperature can be divided into two categories: one is the critical temperature (Ac3 or Ac1) above the annealing, also known as phase change recrystallization annealing. Including full annealing, incomplete annealing, isothermal annealing, annealing and diffusion annealing the ball, etc.; the other is the critical temperature (Ac1) following annealing, also known as low-temperature annealing. Including the recrystallization annealing, to stress and dehydrogenase heat. By cooling can be divided into isothermal annealing and continuous cooling heat. Quenching and tempering of steel quenching and tempering of steel heat treatment process is very important, is widely used in the process. Quenching can significantly improve the strength and hardness of steel. If matched with different tempering temperatures, you can eliminate (or reduce) the stress hardening, but also by strength, hardness and toughness of the match, to meet different requirements. Therefore, quenching and tempering are inseparable two heat treatment process. Quench hardening of steel is heated to above the critical point of steel, after heat is greater than the critical cooling rate (Vc) cooling to obtain the martensite or lower bainite heat treatment. Tempering steel tempering is heated to the quenching of steel below the A1 temperature holding a certain time, cooled to room temperature in an appropriate manner the heat treatment process. It is the next road immediately quenching heat treatment process, also decided to use state of the steel in the organization and performance, the relationship between the life of the workpiece, it is the key process. The main purpose of tempering is to reduce or eliminate the quenching stress; ensure that the appropriate organizational changes to the workpiece size and stable performance; to improve the heat resistance of steel and plastic, choose a different tempering temperature to obtain the hardness, strength, ductility or toughness of the appropriate coordination to meet the performance requirements of different workpieces. Difference between normalizing and annealing normalizing and annealing There are four main differences: (1) normalizing the temperature is higher, lower annealing temperatures. (2) normalizing annealing cooling faster than the cooling speed. (3) the use of effect of different treatment after carburizing, normalizing to eliminate network cementite, annealing can not. on the carbon content of less than 0.25X, after normalizing to improve the hardness and improve the cutting performance, but do not anneal to. (4) normalizing the cycle is short, easy to operate; annealing cycle is long, the operation more difficult (ie the need to control a certain cooling rate.)
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