High frequency quenching normalizing, tempering, annealing what is the difference?
1, different processing technology: & emsp;
Normalizing is to product the workpiece heated to Ac3 (
Ac refers to all transformed into heating free ferrite austenite end temperature, usually from 727 ℃ to 912 ℃)
Or Acm (
Acm is the actual heating in hypereutectoid steel completely austenitizing critical temperature line)
After more than 30 ~ 50 ℃, the heat preservation time, from the furnace in air or water, spray or cooling metal heat treatment process.
Tempering treatment to the high frequency quench hardening or normalization treatment of the steel after certain time immersed in a lower than critical temperature, cooling down at a certain speed.
Annealing is heated to a certain temperature, the metal material to keep enough time, then cooling (with appropriate speed
Normally is relatively slow cooling, sometimes is to control the cooling)
Some metal materials heat treatment process.
Steel quenching is one of high frequency will Ac3 steel heated to a critical temperature (
Or Ac1 (
Over temperature, holding time, and make it all or part of the austenitizing, then at greater than the critical cooling rate of cold faster cold below Ms (
Isothermal near or Ms)
Into the heat treatment process.
2, different raw materials organization change: & emsp;
Organization: after normalizing hypoeutectoid steel for ferrite + pearlite, eutectoid steel for pearlite, hypereutectoid steel for pearlite + secondary cementite, and is not continuity.
Low temperature tempering was martensite structure;
With tempering temperature tempering of tissues in austenite;
High temperature tempering tempering treatment was tempered sorbite organization.
Refine grain size after annealing, adjusting organization, eliminate tissue defects.
High frequency quenching the supercooled austenite to martensite and bainite transformation into, get martensite and bainite organization, finally obtain imbalance, which is mainly composed of martensite structure (
According to the need to obtain bainite or single-phase austenitic)
3, raw material properties change results vary: & emsp;
Is in the fast cooling when the fire made the crystal grain refining of steel and it not only can get a satisfactory strength, but also can improve flexibility (
, reduce the cracking tendency of components.
Some low alloy hot rolled steel plate, low alloy steel forgings and castings after normalizing treatment, the comprehensive mechanics performance of the raw materials can also be greatly improved, but also improve the cutting performance.
After tempering after high frequency quenching and normalizing process warm immersion in the back,
A certain period of time, can make the carbide precipitation of the part, at the same time has caused by rapid cooling can eliminate part of the residual stress, and thus can improve the flexibility of raw materials and flexible.
Annealing can reduce the rockwell hardness, improving cutting processability.
Eliminate the residual stress, stable dimension, reduce the deformation and cracking tendency;
Fine grains, adjust, eliminate defects.
Organization of raw materials and ingredients, improve the performance of raw materials or do organization to prepare for after heat treatment.
High frequency quenching steel can be greatly improved rigidity, rockwell hardness, wear resistance, fatigue strength and flexibility, thus satisfy all kinds of machinery parts and tools use different requirements.
Also can satisfy some special steel by high frequency hardening of ferromagnetism, corrosion resistance, etc. , the physical and chemical properties.
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heating equipment manufacturers, gathered a number of specialized is engaged in the induction heating equipment, senior experts research, design, production manufacturing, sales and service in one of the high-tech private enterprises.
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