Seven types of annealing methods Part2
2022-07-08

Isothermal annealing
Complete annealing takes a long time, especially for alloy steel with stable undercooling austenitization. If the austenitized steel is quickly cooled to slightly lower than AR1 temperature, a is transformed into P, and then air cooled to room temperature, the annealing time can be greatly shortened. This annealing method is called isothermal annealing.
Process: Heat the steel to a temperature higher than AC3 (or AC1), hold it for an appropriate time, quickly cool it to a certain temperature in the pearlite area, keep it isothermal, transform austenite into pearlite, and then air cool it to room temperature.
Objective: As with complete annealing, the transformation is easy to control.
It is applicable to a relatively stable steel: high carbon steel (WC>0.6%), alloy tool steel and high alloy steel (total amount of alloy elements>10%). Isothermal annealing is also beneficial to obtain uniform microstructure and properties. However, it is not suitable for large cross-section steel parts and large quantities of furnace charge, because isothermal annealing is not easy to make the interior or batch of workpieces reach isothermal temperature.
The heat treatment process of heating the metal or alloy to an appropriate temperature, holding it for a certain period of time, and then slowly cooling (usually cooling with the furnace) is called annealing.
Related News
Principle of mold processing reservation allowance
2023-09-18 9DIN 1.2311 Plastic Mold Steel
2023-09-15 11Selection and Heat Treatment of Die Casting Mold Materials
2023-09-08 15Tooling classification
2023-09-01 24Die steel -1.2738/1.2738HH
2023-08-24 29Mold processing accuracy requirements
2023-08-14 36The main causes of thermal cracks and preventive measures
2023-08-08 39TQ1 Impresses with its Excellent High-Temperature Strength at Higher Working Temperatures
2023-08-03 52Characteristics of die-cast zinc alloy
2023-07-28 56Die Cast Mold
2023-07-25 41Heat treatment - Normalizing
2023-07-12 28Material cracking during heat treatment
2023-06-27 301.4034 tool steel indispensable for saving lives in surgery
2023-06-25 30Kind&Co - Premium steels offer an excellent combination of high toughness and good thermal shock resistance
2023-06-16 39What is high pressure die casting (HPDC)?
2023-06-13 30Classification of forging
2023-05-31 27Undercut molding
2023-05-25 371.2085 Characteristics of die steel
2023-05-15 25Fundamental changes apply for products in future concepts within the automotive die casting
2023-05-12 27What is low pressure die casting (LPDC)?
2023-04-24 38