Chì hè u prucessu di trattamentu di u calore di l'inserimentu di chjave di chjave A286?

U prucessu di trattamentu termicu per l'inserti di serratura di chjave A286 si compone principalmente di duie tappe: trattamentu suluzione è invechjamentu. I paràmetri di prucessu specifichi è i passi sò i seguenti:

1. Trattamentu di suluzione
– Gamma di temperatura: Di solitu, heating at 982°C (1800°F) for one hour, followed by rapid cooling. Some standards recommend holding at 899°C for two hours, followed by rapid cooling.
– Cooling Method: Di solitu, air cooling or oil quenching is used.
– Purpose: High-temperature heating dissolves carbides and nitrides in the alloy, resulting in a single-phase austenite structure, relieving processing stresses, and improving the toughness and ductility of the material.

2. Aging Treatment
– Gamma di temperatura: 704-760°C (1300-1400°F).
– Holding Time: Di solitu 12-16 ore, followed by air cooling.

3. Special Treatment
– Double Aging: In certi casi, a double aging treatment is performed. This involves holding at 704/760°C for 16 ore, then air cooling to 649°C, holding for another 8-12 ore, and finally air cooling. This treatment further improves notch cracking strength while maintaining a balance between toughness and hardness.
– Dimensional Change: After aging, the material will shrink slightly, approximately 0.001 in/in.

4. Precautions
– Temperature Control: The temperatures of the solution and aging treatments must be strictly controlled to ensure optimal material properties.
– Cooling Rate: The cooling rate after solution treatment has a significant impact on material properties. Rapid cooling helps achieve a fine grain structure, thereby improving toughness.
– Repeated Aging: In certi casi, multiple aging treatments may be necessary to further optimize material properties.

Through this heat treatment process, the A286 key locking insert achieves excellent high-temperature strength, corrosion resistance, and good processing properties, meeting the application requirements of demanding fields such as aerospace.