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钢热处理工艺的四把火-退火、正火、淬火、回火(国外英文资料)
钢热处理工艺的四把火-退火、正火、淬火、回火(国外英文资料)
Four fire of steel heat treatment process
Annealing: heat the steel to a certain temperature to cool the furnace
Positive: heat the steel to a certain temperature to cool off
Quench: heat the steel to a certain temperature for water cooling or oil cooling
Tempering: reheat the hardened steel to a cool temperature
1. Steel annealing
Annealing is a commonly used heat treatment process in production. The non-uniformity of the internal stress and composition of the casting, forging and welding parts of the parts and the molds of the parts of the machine and the molds of the molds shall be eliminated. Can improve and adjust the mechanical properties of steel and prepare for the preparation of the next process. Low, less important parts and some common castings and welding parts, the annealing can be treated as final heat treatment.
The annealing of the steel is to heat the steel to the appropriate temperature for a certain amount of time, then slowly cool down to obtain the heat treatment process of the near balance. The purpose of annealing is to prepare the organization for the uniform chemical composition, improve mechanical properties and process performance, eliminate or reduce internal stress and prepare for the final heat treatment of the parts.
Annealing process of steel types, according to the heating temperature can be divided into two categories: one is above the critical temperature (Ac3 or Ac1) annealing, also known as the phase change of recrystallization annealing. Including complete annealing, incomplete annealing, isothermal annealing, spherification annealing and diffusion annealing; Another is the annealing of the critical temperature (Ac1), also known as low temperature annealing. Including recrystallization annealing, stress and dehydrogenation. The cooling mode can be divided into continuous cooling annealing and isothermal annealing.
Hardening and tempering of steel
The hardening and tempering of steel are very import
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