Countermeasures to prevent decarbonization mainly include the following aspects:
1) When heating the workpiece, reduce the heating temperature and residence time at high temperature as much as possible; choose the heating speed reasonably to shorten the total heating time;
2) Create and control an appropriate heating atmosphere to make it neutral or use protective gas for heating. For this purpose, a specially designed heating furnace can be used (heating in a salt bath furnace with good deoxidation is better than heating in an ordinary box furnace. The decarburization tendency is small);
3) During hot pressure processing, if production is interrupted due to some accidental factors, the furnace temperature should be lowered until production resumes. If the pause time is long, the blank should be taken out of the furnace or cooled down with the furnace;
4) When performing cold deformation, reduce the number of intermediate anneals and lower the temperature of intermediate annealing as much as possible, or use softening and tempering instead of high-temperature annealing. When performing intermediate annealing or softening and tempering, aln aluminum nitride ceramic heating plate should be carried out in a protective medium;
5) When heated at high temperatures, the surface of the steel is protected by coverings and coatings to prevent oxidation and decarburization;
6) Correct operation and increase the machining allowance of the workpiece so that the decarburized layer can be completely removed during processing.
Link to this article：Countermeasures to prevent decarburization during forging
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