Let's talk about the heat treatment process of the alloy tee.
Release time:
Mar 15,2023
Let's talk about the heat treatment process of the alloy tee.
The heat treatment process of alloy tee can be divided into ordinary heat treatment (annealing, positive fire, quenching and tempering), surface heat treatment (surface quenching and chemical heat treatment) and deformation heat treatment.
Annealing is a heat treatment process in which the steel is heated to the critical point A, higher or lower than the critical point A, and slowly cooled with the furnace after heat preservation to obtain a microstructure close to the equilibrium state. The purpose of the alloy tee is to make the chemical composition and microstructure of the steel uniform, refine the grain, adjust the hardness, eliminate the internal stress and work hardening, improve the forming and cutting performance of the steel, and prepare the microstructure for quenching, the annealing process can be divided into complete annealing, incomplete annealing and spheroidizing annealing, diffusion annealing, stress relief annealing and recrystallization annealing according to different heating temperatures. The annealing temperature and complete annealing are mainly used for hypoeutectoid steel. It is a heat treatment process in which the steel is heated to 20~30 above the AC temperature, and then slowly cooled after complete austenitization to obtain a nearly balanced microstructure.
The purpose of complete annealing of alloy tee joint is to refine grain size, uniform structure, eliminate internal stress, reduce hardness, and improve workability and cold plastic deformation ability of steel. Incomplete annealing is mainly used for hypereutectoid steel to obtain spherical pearlite structure, I .e. heating the steel to A ~ A (hypoeutectoid steel) or AC;~ Accm (hypereutectoid steel), then holding and slowly cooling, to obtain a nearly balanced microstructure, the purpose of incomplete annealing is to reduce hardness, eliminate internal stress, and improve processability. Incomplete annealing is also called spheroidizing annealing. In fact, spheroidizing annealing is a kind of incomplete annealing.
Why alloy tee conductive performance is good?
Alloy tee usually, people say that the metal is a material with good electrical conductivity, thermal conductivity, ductility (plasticity) and metallic luster. The strict definition of metal is that the metal is a material with a positive temperature coefficient of resistance, and all non-metallic The resistance decreases with the increase of temperature, and its temperature coefficient of resistance is negative.
The connection between alloy tees is realized by metal combination. According to the viewpoint of modern physics and chemistry, metal bond refers to alloy tees in the state of aggregation, all or most of which contribute their valence electrons. These valence electrons move around all atomic nuclei according to the law of quantum mechanics, that is, electron clouds. The atoms contributing bid electrons become positive ions and are immersed in the electron cloud, they are bound by electrostatic interaction of common free electrons moving between them.
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