XIONGDA METAL
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25
2024
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01
What are the vacuum heat treatment processes?
Author:
Vacuum heat treatment is mainly divided into the following:
Sintering: Vacuum heating is carried out at a temperature lower than the melting point of the basic components of the powder or powder compact, so that solidification occurs between the powder particles and become a grain agglomerate, and finally a dense sintered body is obtained.
Brazing: In the vacuum heating state, the liquid brazing filler metal with lower melting point than the base metal is infiltrated and diffused by the tiny gap between the workpieces, and the gap of the base metal is filled to form a strong metal combination.
Quenching: In the vacuum heating state, the steel or alloy workpiece is heated to a certain temperature and maintained for a certain period of time, and then quenched by the cooling medium, so that the workpiece is transformed from austenite to martensite, and the hardness is improved. According to the different cooling medium is divided into: gas quenching, oil quenching and water quenching.
Tempering: The quenched workpiece is heated at different temperatures in a vacuum and cooled to obtain tempered martensite, tempered troostite or tempered sothite with a certain hardness and toughness. Quenching and tempering are inseparable, and the process of combining quenching and high temperature tempering is called quenching and tempering (tempering Sotheby).
Annealing: the steel workpiece in the vacuum state of heating, heat preservation and cooling with the furnace, so as to remove the internal stress caused by the work hardening, so that the internal organization of the workpiece to reach or close to the equilibrium state, enhance the extensibility, improve the plasticity.
Solid solution: the stainless steel or alloy workpiece is heated to a certain temperature in a vacuum state, and after heat preservation and cooling, the alloy phase inside the workpiece is fully dissolved to form an organizational state change and obtain a solid solution, eliminating stress, improving and improving the plasticity of the workpiece, Toughness and corrosion resistance, in order to continue processing or forming.
Aging: stainless steel or alloy workpiece after solid solution treatment, after heating to a certain temperature in vacuum insulation, so that its performance, shape, size changes with time, thereby eliminating internal stress, stable organization and size, improve mechanical properties.
Positive fire: The steel workpiece is heated to above the austenitizing temperature and slowly cooled after a period of time, thus changing the internal matrix organization of the workpiece.
Degassing: The workpiece is heated to a certain temperature in a vacuum state and kept warm for a period of time, so that the impurity gas inside the workpiece is released, which inhibits aging embrittlement and improves mechanical properties.
Magnetic annealing: A heat treatment process to remove the internal stress of soft magnetic materials due to rolling or stamping.
Dehydroxylation: Through high-temperature roasting and exhaust under high vacuum for a long time, the hydroxyl impurities in the quartz workpiece escape, and the quality and service life of the workpiece are improved.
2. Heat treatment comparison:
Vacuum heat treatment: clean processing environment, no oxidation and decarburization, degreasing and degassing; inhibit the volatilization of metal elements inside the workpiece, surface brightening, small quenching deformation, improve wear resistance, fatigue strength and machinability, stable process with repeatability, energy saving and environmental protection, easy recovery cost.
Controlled atmosphere heat treatment: after treatment, the surface of the workpiece is rough, not bright, lack of surface metal elements.
Atmospheric heat treatment: there is oxide film on the surface of the workpiece, the treatment environment is bad, and the use is narrow.
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